EGU General Assembly 2024  

Measurements and observations are essential to the development and advancement of understanding in the geosciences. Measurements are also critical to the detection and quantification of long term change and short term hazards, at a time when non-stationarity in Earth systems is increasing and extreme events are occurring daily. For many regions and domains however, observational networks are lacking, while the need for information is increasing due to growing human populations, intensifying geopolitical pressures and Earth’s rapidly changing climate.

Through FutureEO, a series of world-class research satellite missions, the Earth Explorers, are realised. Since the successful launch of the first Earth Explorer in 2009, these missions, which are proposed by the scientific community, continue to demonstrate how breakthrough technology can deliver an astounding range of scientific findings about our planet. They lead to the scientific excellence that is critical to addressing the challenges society faces today and is expected to face in the decades to come – from understanding different aspects in the climate system such as atmospheric dynamics and ice melt, to societal issues such as food security and freshwater resources. Importantly, Earth Explorers also provide sound heritage for developing operational missions. For instance, some of the highly successful current suite of Copernicus Sentinel missions and the future Copernicus Sentinel Expansion missions would simply not be possible without the technology and application opportunities demonstrated by the Earth Explorers.

This talk will present the FutureEO programme and its opportunities to advance our measurement capabilities in the geoscience. It will present the family of Earth Explorer satellites and future planned missions, highlighting their scientific goals and objectives. Based on lessons learned it will also discuss the challenges of launching first of its kind measurement systems and related science activities.

How to cite: Scipal, K.: ESA’s Earth Explorer Satellites – Advancing Measurement Capabilities in the Geoscience through the FutureEO Programme., EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-11041, https://doi.org/10.5194/egusphere-egu24-11041, 2024.

The NASA/CNES international Surface Water and Ocean Topography (SWOT) mission was launched in December 2022 to provide the first global survey of the Earth’s surface waters. The fundamental advancement of SWOT is the capability to observe the elevation of the ocean and terrestrial surface waters with the resolution of SAR imagery.  The 2D spatial resolution is more than an order of magnitude better than conventional satellite altimetry, enabling the study of water storage and exchange from millions of small-scale lakes, rivers and floodplains, as well as observing the small-scale ocean eddies and fronts that are essential to the ocean’s heat and carbon uptake from the atmosphere. The increased resolution will also advance the study of nearshore processes to assess the coastal impact of sea level rise, flooding and severe weather. SWOT’s global coverage up to 78° in latitude allows enhanced observation of the ocean circulation and sea-ice dynamics in the rapidly-changing polar oceans.

During the first 6 months of the mission, SWOT was in a 1-day fast-repeat orbit, firstly for engineering checkout and then for scientific validation. This provided a unique data set to explore the rapid evolution of the small-scale dynamics and water storage and exchange. From mid-July 2023 onwards, SWOT has provided global coverage in its 21-day orbit, and will continue for a minimum of 3 years. Numerous field campaigns were conducted in 2023 to validate SWOT in the open ocean, nearshore and coastal regions, and over the lakes and rivers sampled by SWOT’s repeat orbits.

SWOT’s unique, high-resolution 2D observations of water elevation and SAR imagery, combined with field campaign data, and other satellite data and models, provide a new vision of many small-scale dynamical phenomena: from ocean and nearshore zones (mesoscale eddies, dynamical fronts, tides and internal tides, effects of air-sea interactions) to coastal and estuarine contexts (tidal deformation, multi-scale water level changes, flooding) and the global freshwater water storage and exchange between lakes, reservoirs, and rivers. Yet the rapid changes of the ocean and inland waters revealed by the 1-day repeat data pose a challenge to the analysis of the 21-day repeat data from the global mapping phase of the mission.  New mapping techniques are required to enable us to retain the small-scale, rapidly-evolving structures that are observed as snapshots during the global 21-day sampling phase. The SWOT mission team are reaching out to machine learning, data inversion and assimilation specialists to help us reap the rewards from a wealth of new global information about the Earth’s surface waters. Finally, SWOT is the first global mission demonstrating excellent results with SAR-Interferometry, paving the way for future planned operational missions in the 2030s (eg Copernicus Sentinel-3 Next Generation Topography missions).

How to cite: Morrow, R., Fu, L.-L., Farrar, J. T., Pavelsky, T., and Cretaux, J.-F.: The first global survey of the Earth’s surface waters with the SWOT satellite mission, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-13060, https://doi.org/10.5194/egusphere-egu24-13060, 2024.

Microwave links from cellular communication networks have been proposed as an opportunistic source of environmental (notably atmospheric) data more than two decades ago. The first scientific studies demonstrating the potential of this ground-based remote sensing technique for precipitation monitoring, in particular for areas around the world were dedicated rainfall observation networks are sparse, were published more than 15 years ago. Since then, a small but dedicated community of scientists and engineers working at universities, national meteorological services, consulting companies, mobile network operators and telecommunication equipment manufacturers has been making significant progress in turning this promise into a reality. In the meantime, numerous papers and reports have been published, conference presentations have been given and courses have been delivered. However, real-time access to high-resolution environmental information from commercial microwave link networks over large continental areas is still a dream. How far have we come after more than 20 years of research and development? What does the future have in stall for the geosciences and their applications? What should be done to turn this dream into an operational reality? This presentation will attempt to provide some preliminary answers to these questions by reviewing the current status and future directions in the field of environmental monitoring using wireless communication networks.

How to cite: Uijlenhoet, R.: Environmental Monitoring using Wireless Communication Networks: Current Status and Future Directions, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-19792, https://doi.org/10.5194/egusphere-egu24-19792, 2024.

The Earth is facing increasingly frequent natural disasters and environmental changes that require continually advancing techniques to observe, measure, understand and respond to. For decades, Synthetic Aperture Radar (SAR) data has provided a critical input for scientists, engineers and analysts seeking to gain a better understanding of the processes that occur before, during and after an event. Although some processes are slowly evolving, taking months or even years to accumulate significant change, it is the critical moments just prior to an event and onward that often require data more frequently than it is available. Similarly, some earth processes simply develop too quickly to be captured with a revisit rate of several days or weeks.

A new paradigm is emerging in earth observation, enabled by the proliferation of SAR sensors in orbit that can be combined to provide daily and even sub-daily coherent revisit rates. Along with these new satellite missions come advances in sensor technology providing enhanced modes of SAR imaging. Among these is long-dwell imaging that provides considerably richer information and perhaps most interestingly, the ability to produce SAR videos, capturing changes as they occur. 

This talk will present highlights from our experience utilizing the ICEYE SAR constellation in real earth science and natural catastrophe scenarios where rapid revisit or long-dwell were key enabling factors. By showing a glimpse into these dynamic processes as they unfold, we hope to inspire a new way of thinking about SAR data and challenge the conventional wisdom about what problems can and cannot be solved using SAR. It’s clear that we are only scratching the surface and that there remain many new things we can learn.

How to cite: Wollersheim, M.: Keeping up with a fast changing world with rapid-revisit and long-dwelling SAR observations, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-22578, https://doi.org/10.5194/egusphere-egu24-22578, 2024.

Cross-scale feedbacks between hydrology, vegetation, permafrost thaw, and wildfire will drive Arctic carbon cycle responses including methane emissions to the atmosphere. This presentation will summarize recent findings from several large-scale empirical projects examining interactions between disturbance regimes and their consequences for vegetation and carbon storage and fluxes in interior Alaska and northwestern Canada.  A long-term monitoring project at the Alaska Peatland Experiment (APEX) found that early onset of abrupt thaw, driven by active layer thickening with no visible thermokarst, was predicted by changes in the moss community and stimulated CH₄ fluxes 5-fold, accounting for 30% of the total annual thaw-driven increase in CH₄. Methane emissions at several sites in interior Alaska were sensitive to rainfall and surface moisture conditions, with spring rain events stimulating soil warming and methane fluxes. Finally, new tools have allowed us to identify and examine forests and peatlands that experienced overwintering or zombie fire conditions, with early results showing interesting regional differences in how these novel fire conditions influence fuel combustion and carbon release.  Results from recent and ongoing studies will be used to frame forward-looking research questions and approaches urgently needed to better understand the fate of permafrost carbon.  In particular, I will discuss several efforts to incorporate abrupt thaw into circumpolar upscaling and modeling studies. Unlike active layer thickening, abrupt thaw impacts meters of soil rapidly, occurs on a fine-scale not easily detected in remote sensing products, and is further destabilized by rainfall, wildfire, and vegetation change.

How to cite: Turetsky, M.: Arctic methane emissions under novel disturbance regimes: interactions between permafrost thaw, changing precipitation, and peat fires, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-4779, https://doi.org/10.5194/egusphere-egu24-4779, 2024.

Rapid Arctic environmental change affects the entire Earth system as thawing permafrost ecosystems release greenhouse gases to the atmosphere. The permafrost soil carbon pool contains three times as much carbon as in the atmosphere, with 1440-1600 Pg C known, and another ~960 Pg C in other deep sediments and subsea. The permafrost region contains 50% of the soil carbon found in all other Earth’s biomes (0-3m) in only 15% of the global soil area, and this is likely a minimum. Understanding how much permafrost carbon will be released, over what time frame, and what the relative emissions of carbon dioxide and methane will be is key for understanding the impact on global climate. In addition, the response of vegetation in a warming climate has the potential to offset at least some of the accelerating feedback to the climate from permafrost carbon. Temperature, organic carbon, and ground ice are key regulators for determining the impact of permafrost ecosystems on the global carbon cycle. Together, these encompass services of permafrost relevant to global society as well as to the people living in the region and help to determine the landscape-level response of this region to a changing climate.

Nine scenarios of cumulative net carbon dioxide and methane emissions over this century were developed to encompass the full range permafrost carbon emissions projections linked to global and Arctic warming. These cumulative permafrost carbon emission scenarios range from 55 to 230 Pg C (C-CO₂-equivalent units) and represent future Arctic carbon emissions that can be compared relative to national-level emissions that are the focus of climate change mitigation conversations. This helps to place these scenarios alongside policy conversations aimed at reducing national greenhouse gas emissions. Many of the modeled climate change trajectories where mitigation of human carbon emissions leads to various global temperature targets do not necessarily contain all of the detailed information for the Arctic carbon cycle as compared to the projections reviewed here. In this way, it can be helpful to view potential Arctic carbon emissions as the equivalent of an additional large industrialized nation of carbon emissions that must be accounted for in order to reach specific temperature targets. Arctic carbon emissions accelerate climate change, adding 10-15% to future fossil fuel emissions, potentially decreasing the land carbon sink by 33-50%. Accounting for these additional greenhouse gas emissions will help to slow climate change and potentially avoid Arctic carbon cycle surprises from abrupt thaw and other threshold events.

How to cite: Schuur, E. (. and the Permafrost Carbon Network: Permafrost and Climate Change: Carbon Cycle Feedbacks From the Warming Arctic, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-13797, https://doi.org/10.5194/egusphere-egu24-13797, 2024.

The Arctic Methane and Permafrost Challenge (AMPAC) is an ESA and NASA collaborative community initiative to help tackle the scientific challenges in estimating current and future methane fluxes from the Arctic region. Under this umbrella, AMPAC-Net is an ESA funded project to foster collaborations and scientific exchange on the Arctic methane challenge. The six guiding goals are: (1) Engaging the community, workshops, dialogue (2) Advancing EO products, novel methods, algorithms (3) Reconciling bottom-up & top-down approaches (4) Data catalogues, open science and data sharing (5) Summer schools, training, outreach and education and (6) Networking, including supporting scientific exchanges. The initiative is further supported through the ESA funded project MethaneCamp with focus on improvement of satellite retrievals of methane concentrations in the Arctic.

As part of AMPAC-Net, relevant already published datasets have been included into a catalogue (https://apgc.awi.de/group/about/ampac) including datasets for methane (in situ, satellite derived concentrations, airborne campaign data, inversions etc.) and landcover/wetlands.

Bottom-up estimates rely on accurate representation of Arctic landcover, especially wetlands as potential methane source. The heterogeneity of Arctic landcover requires high spatial resolution and appropriate thematic content. Existing circumpolar landcover data and a range of in situ data have been investigated with respect to wetlands and heterogeneity supporting AMPAC goals, especially the new landcover units derived from Copernicus Sentinel-1 (Synthetic Aperture Radar) and Sentinel-2 (multispectral) satellite missions (ESA Permafrost_CCI, 10 m).

Further on, the potential of new, approved European satellite missions for AMPAC goals is discussed.

https://www.ampac-net.info/

https://methanecamp.fmi.fi/

How to cite: Bartsch, A., Hugelius, G., Grosse, G., Hashemi, J., Treat, C., Goeckede, M., Tamminen, J., Fix, A., Sachs, T., Houweling, S., Bergstedt, H., and Widhalm, B.: Remote sensing supporting the Arctic Methane and Permafrost Challenge (AMPAC), EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-14843, https://doi.org/10.5194/egusphere-egu24-14843, 2024.

DDE's ambition is to make better use of data from the earth sciences to produce new knowledge using new digital tools such as AI. The earth sciences have always relied on observations to produce knowledge. Scientists have always had a duty to ensure the quality of their data and to enable it to be reused by other researchers, by describing it as precisely as possible.

In the DDE approach, which makes use of vast quantities of digital data from a variety of sources, it is particularly important to be able to ensure the quality and relevance of the data used, in order to have confidence in the results produced by this approach. These data may have been produced by the scientific community on different continents, at different times, often for specific purposes.

When data is made available to researchers on platforms, it must comply with the FAIR (Findable - Accessible - Reusable - Interoperable) principles. For these principles to be implemented, the international community needs to agree on common terminologies and ontologies produced by the scientists themselves. This approach will provide machines with the reference systems needed for the reasoning used in AI.

As part of DDE, a Task Group on Standards (DDE/STG) has been set up to adopt common standards and a common approach to producing and updating these standards. This task group draws on the expertise of the Commission for the Management and Application of Geoscience Information (IUGS/CGI) and the Committee on Data of the International Science Council (CODATA). This presentation will provide an update on this work.

How to cite: Robida, F., Minghua, Z., Thorleifson, H., and Rattenbury, M.: Standards: a key tool for DDE, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-4558, https://doi.org/10.5194/egusphere-egu24-4558, 2024.

Minerals and the rocks that hold them are the oldest objects that we can hold in our hands. Each specimen is an information-rich time capsule, waiting to be opened. Every sample contains scores of attributes, including trace and minor elements, stable and radiogenic isotopes, solid and fluid inclusions, optical and magnetic properties, structural defects, twinning, exsolution, zoning, and more. These diagnostic attributes are enhanced by information on the ages, associations, and geological contexts of specimens. Collectively, these characteristics of minerals tell stories of the origins and evolution of planets and moons.

Mineral informatics[1], a field championed by the Deep-time Digital Earth Program, advances understanding of planetary evolution by pursuing three complementary objectives. First is to develop comprehensive open-access data resources for minerals and rocks. Several vital platforms, including mindat.org, earthchem.org, and rruff.info, provide large and growing resources for researchers. Ongoing work will build these essential research tools, while advancing a culture of FAIR data.

A second objective of our work is to establish a new mineral classification system based on mineral informatics that highlights formation processes and evolutionary stages of minerals [2-6]. Traditional approaches to classifying minerals ignore this history. The International Mineralogical Association has catalogued >6000 mineral species, each with a unique combination of idealized chemical composition and crystal structure. This essential scheme facilitates identification of different condensed crystalline building blocks of planets and moons. However, the IMA system lacks contexts of time and process. We have introduced, and are now completing, a new and complementary approach to mineral classification called the “evolutionary system of mineralogy.” Our system differs from that of the IMA in three important ways. (1) We split many IMA species based on their varied modes of formation and age of earliest occurrence. For example, diamond (carbon in the diamond crystal structure in the IMA system) occurs in at least 5 distinct mineral “kinds” in the evolutionary system, including stellar diamond and impact diamond. (2) We lump varied IMA species that form continuous solid solutions through the same process, for example, combining different species of the tourmaline group into a single kind. (3) We include  amorphous  solids, such as obsidian and limonite, which are important in crustal processes. 

A third goal of the mineral informatics program is to develop and apply advanced methods of data analysis and visualization to better characterize evolving mineral systems through more than 4.5 billion years of planetary history. To this end, we have incorporated network analysis, cluster and analysis and community detection, association analysis, and other methods to quantify the changing diversity and distribution of minerals through deep time, while estimating total mineral diversity and predicting new localities of critical mineral resources.

References: 1. Prabhu et al. (2023) Am.Min., 108, 1242-1257; 2. Hazen R.M. et al. (2008) Am.Min., 93, 1693-1720; 3. Hazen R.M. & Morrison S.M. (2022) Am.Min., 107, 1262-1287; 4. Hazen, R.M. et al. (2023) In: Bindi and Cruciani [Eds.], Celebrating the International Year of Mineralogy. NY: Springer, pp.15-37; 5. Hazen R.M. et al. (2022) Am.Min., 107, 1288-1301; 6. Hazen R.M. (2019) Am.Min., 104, 468-470.

How to cite: Hazen, R. M., Morrison, S. M., and Prabhu, A.: Mineral Informatics: A Key to Deep-Time Data-Driven Discovery in Earth and Planetary Sciences, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-4641, https://doi.org/10.5194/egusphere-egu24-4641, 2024.

Plate tectonic reconstructions have progressed substantially over the last decade, incorporating evolving plate boundaries as well as plate deformation. These technological innovations have spurred the construction of a variety of new regional and global plate models. They are acting as a catalyst for the emergence of a new generation of geodynamic models as well as new approaches for studying the flux of material, including volatiles, from the surface to the deep Earth and vice-versa. Plate models with dynamic plate boundaries have evolved to reach further back in geological time, extending into the Proterozoic. Uncertainties in Proterozoic reconstructions are difficult to quantify, but the availability of the GPlates software accompanied by a variety of open-access data sets has enabled the community to develop alternative models, exploring a range of possible interpretations of available geodata to reconstruct plate motions and plate boundary evolution. The emergence of deep-time plate models has opened numerous opportunities for Earth system analysis, including an improved understanding of the evolution of Earth's mantle structure through time, quantifying solid Earth carbon degassing, and linking biodiversity evolution to plate tectonic and surface processes. Three additional developments are significant in the context of emerging spatio-temporal deep-time data analysis: (1) the availability of large open-access geological, geochemical and geochronological databases; (2) the spread of shared open-source software and workflows aiding data analysis; and (3) the rapid recent rise of open AI tools to extract new knowledge from a complex, hyperdimensional data volume through space and time. The pyGPlates and GPlately python libraries have particularly played an enabling role for allowing the analysis of plate models as well as geodata attached to tectonic plates. Together, these developments are catalysing the emergence of entirely new approaches to study deep time Earth system evolution. The applied drivers of deep-time geodata science are to a large extent tied to rapid climate change, the need to better understand potential future trajectories of Earth's surface environments and to enable a transition to renewable energy generation and an electrified transport sector. This transition demands a significant increase in exploration for and discovery of critical minerals below the well-explored surface. It is estimated that at least 384 new mines for graphite, lithium, nickel and cobalt alone are required to meet demand for battery energy storage by 2035. Deep-time Earth models allow the connection of traditional mineral exploration data to evolving tectonic and surface environments, providing the opportunity to build new approaches for better understanding the emplacement and preservation of mineral deposits. The societal and economic need to rapidly reduce our dependence on fossil fuel and to better understand the complex feedbacks between deep Earth, the hydrosphere, atmosphere and biosphere is invigorating the entire field of geology. I will briefly outline some emerging applications of deep-time Earth system analysis and provide an outlook for the future.

How to cite: Müller, D.: Deep time plate configurations and their emerging applications, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-4849, https://doi.org/10.5194/egusphere-egu24-4849, 2024.

How to cite: Du, Z.: Deep-Time.org: One-Stop Online Research Platform for Geoscientists, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-5184, https://doi.org/10.5194/egusphere-egu24-5184, 2024.

Geological information is crucial for the civil society via public authorities, and is produced by scientists from academia and national geological surveys. This information is useful for better use of resources (water, energy, and mineral), adaptation to the climate change, and of course natural hazards. In the meantime, the Earth has become smaller, information technology has improved considerably, and allows to cross-analyze data. If communication is made easier for research and dissemination of the geological knowledge, formats have become the key for scientific exchanges.

The Commission for the Geological Map of the World (CGMW) was created for this exact purpose in the early 20th century in an attempt to bring scientists together, but it took a century to acknowledge that we are more than ever accountable for the preservation of the Earth, and forced to understand the importance of the linkage between geology and global change. As early as 1964, the UNESCO bi-annual program encouraged specialists to develop and use a uniform terminology and classification for the different Earth sciences. CGMW is a rank A UNESCO organization and is affiliated to IUGS and IUGG. The spearheading product of CGMW had been the Geological Map of the World at 1:35M scale for decades, and the opportunity of elaborating a large Geological Map of the World at scale 1:5M – (World5M), was proposed in 2018, as an IUGS Big Science Program DDE (Deep time Digital Earth).

This program, co-funded by the Chinese Academy of Geological Sciences (CAGS), aimed at harmonizing global digital Earth data and securing compatible and interoperable databases, and was rapidly considered as essential for international maps, which can be accessible by a data platform aligned with the vision and mission of the IUGS Big Science Program. This project, (1) integrates at a scale 1:5M the geological maps of continents and oceans which have been produced under supervision of the CGMW, (2) established the legend system and adequate architecture for the map database, and (3) constructed a new seamless and digital geological map of the world at the scale 1:5M. In reality, the geology presented in each small scale continental geological map, differs drastically in terms of stratigraphic cuts and trans-boundary connections of structural continuities. In addition, the databases were constructed originally in different ways with contrasting semantics and data standards, thus requiring a robust collaborative work in Geology and Geomatics. Among the outcomes of the project, is the possibility to integrate selected geological features over a large coverage with a similar resolution. This has been already used in new mapping syntheses, making them more informative.

How to cite: Pubellier, M., Sautter, B., Song, Y., and Wang, C.: Changes in the world of geological mapping, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-5788, https://doi.org/10.5194/egusphere-egu24-5788, 2024.

Earth’s sedimentary record holds physical and chemical clues that allow us to decipher sea level variations in the deep past in fair amount of detail and time resolution, even though many issues remain that stifle precision. On the longer time scales (multiple million years) sea level trajectories can also be reconstructed from paleogeographic data (marine floodings of continents) and geophysical modeling (sea floor geodynamics and basin volume changes). The last few decades have seen significant advances in our understanding of the behavior of sea level at both regional (eurybatic) and global (eustatic) spatial scales and updated sea-level curves have been published for the entire Phanerozoic, albeit with different degree of accuracy and resolution that generally decrease further back in deep time due to increasing uncertainties about timing and amplitudes of eustatic variations. One major recent discovery made through geophysical modeling has been the long-wavelength and relatively slow (multiple million years) warping of continental margins due to mantle driven dynamic topographic changes that significantly affect amplitudes estimates and often go undetected. On the positive side, for some parts of the Mesozoic and for all of the Cenozoic oxygen-isotopic data (δ¹⁸O) of marine benthic foraminifera have proven useful in constraining both the timings and (to a lesser extent) the amplitudes of sea-level rises and falls. Digitizing sea-level variations in deep time poses a challenge, as multiple streams of parallel data have to be correlated with meaningful precision, each dataset having its own inherent degree(s) of uncertainties. Nonetheless, For most portions of the Phanerozoic sea-level variations data, especially the timing of sea-level withdrawals,  has been arrived at through calibration to several different scales (i.e., magnetic reversal, biochronologic, isotopic), as well as absolute time. The Cenozoic (the last 66 Myr.) has also been fine tuned through astronomical (orbital) cyclostratigraphy. Nevertheless deep time eustatic history should be regarded as work in advanced progress and, with periodic revisions (as new bio-chronological data and new technologies become available), it can be kept current for enhanced utility. In this presentation, the advances made in recent years and the state of the art of our current understanding of sea level in deep time will follow the discussion of the technological limitations.

How to cite: Haq, B.: Decrypting Sea Level Variations in Deep Time, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-6059, https://doi.org/10.5194/egusphere-egu24-6059, 2024.

There has been long-standing debate about what environmental factors are the main drivers of biodiversity changes. During the last hundreds of years, there are convincing signs that rising and falling CO₂ and temperatures are affecting both marine and terrestrial biodiversities. However, this has been rarely tested with high-resolution biodiversity changes in deep time. It is also difficult to judge whether the current diversity loss caused by global changes is a long-term tendency or a catastrophic event because the observatory records are too short to predict the future. Fusuline foraminifers were a major group of Carboniferous through Permian marine microorganisms for ~91.8 million years (Myr) during which they experienced changes from icehouse to greenhouse climates. Here we use a high-resolution analysis of fusuline diversity with an average resolution 40 thousand years (kyr) to analyze their speciation and extinction dynamics at multiple temporal levels during this interval of major climatic shifts. This new database encompasses 1391 species from 293 published stratigraphic sections worldwide using constrained optimization method (CONOP). Our results show a symmetric diversity pattern with a peak between 295.24 Ma and 293.57 Ma in the middle of the lifespan of Fusulinida and temporally coincident with the apex of the Late Paleozoic ice age (LPIA). The shift from icehouse to greenhouse climates led to the decline of fusuline diversity. Major disruptions in fusuline diversity are found during the late Moscovian-Kasimovian interglacial event, the post-LPIA long-term warming and the middle-late Guadalupian extinction before the clade was eliminated by the end-Permian mass extinction (EPME). Each of the events of large diversity loss are linked to global warming, probably induced by massive release of greenhouse gases from intensive volcanism. The high temporal resolution also allows us to interrogate the finer-scale patterns revealing that species richness, origination, and extinction rates were paced by long-term astronomical forcing, including ~1.0 Myr obliquity and ~2.1 Myr eccentricity cycles. This highlights the substantial role of astronomically forced climate variability on the rhythms of biological evolution. Our study suggests climatic forcing of long-term changes and catastrophic events in fusuline diversity, with global cooling fueling foraminifera diversifications. This pattern is consistent with the late Cenozoic diversifications of recent foraminifera before the mid-Pliocene warming period.

How to cite: Shen, S., Shi, Y., Zhao, Y., Zhang, S., and Wu, H.: Climate changes driving fusuline macroevolution, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-6960, https://doi.org/10.5194/egusphere-egu24-6960, 2024.

Paleo-CO₂ reconstructions are integral to understanding the evolution of Earth system processes and their interactions given that atmospheric CO₂ concentrations are intrinsically linked to planetary function. Furthermore, past periods of major climate change provide unique insights into the response of land-atmosphere-ocean interactions to warming-induced climate change, particularly for times of pCO₂ comparable to those projected for our future. How well the past can inform the future, however, depends on how well paleo-CO₂ estimates areconstrained. CO₂ estimates exist for much of the past half-billion years (the Phanerozoic), but proxies differ in their assumptions and degree of understanding, and there is substantial uncertainty and inconsistency in existing paleo-CO₂ estimates. Here, we introduce a community initiative, CO₂PIP, focused on advancing the science of paleo-CO₂ reconstruction through critically evaluating and modernizing existing records and building a statistically robust multi-proxy atmospheric CO₂ record for the Phanerozoic. CO₂PIP builds on the previous work of the Cenozoic CO₂ Proxy Integration Project (CenCO₂PIP) Consortium (Hönisch et al., 2023) and takes a multi-step approach to building the next generation Phanerozoic CO₂ record. We are building a standardized paleo-CO₂ proxy data repository that includes all metadata and updated chronology and meets FAIR (findable, accessible, interoperable, reusable) data standards. Existing terrestrial-based CO₂ estimates are being modernized through additional analyses and measurements, and a set of forward proxy system models are being developed to provide a quantified representation of proxy sensitivities to environmental and ecophysiological conditions and processes that govern the CO₂ signals. Ultimately, statistical inversion analysis of the simulated and modernized proxy datasets will be used to produce quantitative, data-driven CO₂ reconstructions for individual records and to generate a robust, quantitative reconstruction of atmospheric CO₂ concentrations through the Phanerozoic. Digital infrastructure for presenting and archiving the CO₂ compilation and project outputs (https://paleo-co2.org/) ensures full accessibility to the scientific community and the public.

Hönisch, B. Royer, D., Breecker, D. O., et al., 2023, Towards a Cenozoic history of atmospheric CO₂. Science, v. 382 (6675), DOI: 10.1126/science.adi5177).

How to cite: Montañez, I., Bowen, G., Breecker, D., Hönisch, B., Huntington, K., and Royer, D.: CO2PIP Consortium for Advancing paleo-CO2 reconstruction and Building the Next-Generation Phanerozoic CO2 Record, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-13387, https://doi.org/10.5194/egusphere-egu24-13387, 2024.

Deep time was discovered by James Hutton on a scientific basis in 1788. However, deep time became deeper since then we know now the earth is older than 4.5 Ga. Since that time, our earth has been cooling considerably. In the Archean the heat flow out of our earth was 6 times more than today. That means strict uniformitarianism cannot be applied for the entire earth history. The question becomes whether the fundamental processes on earth have changed in any fundamental way. Things we do not have actualist examples of the Archean environments today, these forces are to resort to the first principles of physics and chemistry. We have to ask ourselves what mechanism may have dominated heat loss of the planet in the Archaean and the early Proterozoic that governed the tectonic regime of the earth. What mechanism has governed the tectonic regime of the earth in the Archean and the early Proterozoic? The most efficient way is to lose heat with convection. Therefore, we can assume that the convection has always dominated terrestrial tectonics. However, there is a problem; in the Archean the mafic crust was thicker, but the lithosphere was thinner. This arises a doubt whether the subduction was possible under such circumstances. Geochemical work showed that wet melting was going on the earliest Archean. This indicates some sort of subduction must have been going on. On Venus, shortening amounts of hundred kilometers or more in the margins of the Tesserae seems to be accomplished by the décollement folding and thrusting. Then the question is what happened to the underthrust crust? Similar process on early earth may have produced wet melting by transporting ocean water in to the earth’s mantle. This tells us that plate tectonics must have been operative since the earliest time on earth. However, at the time spreading centres and subduction zones must have been much longer than they are today at consequently plates were slower. Continent grow by smashing island arcs against one another including their large subduction accretionary complexes. The principal task in deep earth research today is to be able to track the transition from the tectonics of the very hot earth to the present one. 

How to cite: Şengör, A. M. C.: Deep Time and Uniformitarianism, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-20408, https://doi.org/10.5194/egusphere-egu24-20408, 2024.

This presentation, as part of a DDE-convened Union Symposium at EGU, will discuss avenues to pursue to enable greater Interoperability and Reusability of Deeptime Digital Earth Data, particularly in cross-domain research scenarios.

CODATA is the Committee on Data of the International Science Council (ISC).  Consequently, an important part of its mission is to engage with International Scientific Unions and related initiatives, on data issues.  The ISC has entrusted CODATA to develop a programme of activity: ‘Making Data Work for Cross-Domain Grand Challenges’.  After some exploratory work, the flagship activity is the WorldFAIR project which focuses on the implementation of the FAIR principles both within and across 11 different domain and cross-domain case studies.  Other related work includes the recommendations on FAIR vocabularies, with the International Union for the Scientific Study of Populations (report https://doi.org/10.5281/zenodo.7818157), and in relation to the ISC-UNDRR Hazard Implementation Profiles.  Similarly, CODATA is working with a number of International Scientific Unions, notably IUPAC, around the Task Group on Digital Representation of Units of Measure.

The common threads of this work are both to encourage the adoption and implementation of the FAIR principles, and to explore the requirements for better enabling cross-domain research.  Such work is of paramount importance: the major global scientific and human challenges of the 21st century (including climate mitigation and adaptation, disaster risk reduction, the interplay of society, the economy and energy policy) can only be addressed through cross-domain research that seeks to understand complex systems through machine-assisted analysis at scale.  Our capacity for such analysis is currently constrained by the limitations in our ability to access and combine heterogenous data within and across domains.

CODATA has recently concluded a Memorandum of Understanding with the Deeptime Digital Earth initiative.  This agreement indicates a number of shared interests.  Particularly important is collaboration among DDE, IUGS CGI (Commission for Geosciences Information), and the wider CODATA and FAIR communities on the further development and representation of key terminologies.  Additionally, through a case study approach, DDE, IUGS CGI, CODATA and other partners plan to explore the applicability of the WorldFAIR methodology and the use of FAIR Implementation Profiles to understand FAIR requirements, progress and alignment.  Finally, the applicability of the emergent Cross-Domain Interoperability Framework (CDIF) will be explored, and further refinements and recommendations made. 

This presentation will describe the context for this collaboration and outline the specific activities.  It will be an important opportunity to socialise the community to this initiative, to get feedback and advice on the approach and to invite collaboration and expert input from the wider EGU community.

How to cite: Hodson, S.: Cross-Domain Interoperability and Deeptime Digital Earth Data, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-21592, https://doi.org/10.5194/egusphere-egu24-21592, 2024.