239 datasets

NASA Earthdata CMR + NASA Data Portal2025 · Image data

This dataset holds measurements of Cesium-137 (137Cs) activity sampled from sites in the Atchafalaya and Terrebonne Basins on the southern coast of Louisiana, USA. Sediment cores were taken to validate modeled estimates of soil accretion rates. The NUMAR model was designed to predict soil properties and corresponding accretion rates in marsh environments. This study explored whether the probabilis

NASA Earthdata CMR2025 · collection

Technical Abstract This research evaluates whether the small Coats Land crustal block of East Antarctica is a tectonic tracer linking Kalahari and southern Laurentia within the Neoproterozoic supercontinent of Rodinia across an orogenic suture. A Pan-African (~600 Ma) suture separates the small Coats Land block from the main Mawson Craton indicating that this crustal block had an independent pre-P

NASA Earthdata CMR2025 · collection

Non-Technical Abstract This project will examine ancient Antarctic rocks to understand the continent’s early history, including how Antarctica was once connected to other continents. By studying rock samples from the Nimrod Complex, the project will gather data on the age and makeup of these rocks, showing how Antarctica's crust formed and changed over time. This work will not only expand scientif

NASA Earthdata CMR2024 · collection

Not Available

NASA Earthdata CMR2024 · Table · Comma-Separated Values (CSV)

Perennially ice-covered lakes in the McMurdo Dry Valleys of Antarctica contain abundant microbial mats, and the export of this mat material can fertilize the surrounding polar desert ecosystems. These desert soils are one of the most organic-poor on earth yet host a community of microorganisms. Microbial mat material is exported from the shallow, gas-supersaturated regions of the lakes when gas bu

NASA Earthdata CMR + NASA Data Portal2023 · Image data

This dataset contains carbon-13 (13C) and nitrogen-15 (15N) isotopic signatures of belowground root biomass samples from herbaceous wetlands in the Atchafalaya and Terrebonne basins of the Mississippi River Delta in coastal Louisiana, U.S., during August 2021. The data were collected during the Delta-X Fall deployment. Field measurements were conducted at three sites in the Atchafalaya basin and t

NASA Earthdata CMR2023 · collection

PUBLIC ABSTRACT – NSF 2231558/2231559 COLLABORATIVE RESEARCH: CONFERENCE: INTERDISCIPLINARY ANTARCTIC EARTH SCIENCE CONFERENCE & DEEP-FIELD PLANNING WORKSHOP The unique Antarctic environment offers insight into processes and records not seen anywhere else on Earth, and is critical to understanding our planet’s history and future. The remoteness and logistics of Antarctic science brings together re

NASA Earthdata CMR2023 · collection

Rock sampling made in Fumarole Bay, Cross Hill and Crater 70 (Deception Island). The purpose is to compliment the study the geochemistry of the inclusions trapped within the minerals of these rocks with the volcanic gas collected within the same project in order to contrain as more detailed as possible the plumbing system beneath the volcano

NASA Earthdata CMR2022 · collection

This project will conduct basic research into geological dating techniques that are useful for determining the age of glacial deposits in polar regions, Antarctica in particular. These techniques are necessary for determining how large the polar ice sheets were in the geologic past, including during past periods of warm climate that likely resemble present and near-future conditions. Thus, they re

NASA Earthdata CMR2022 · collection

Warming on the western Antarctic Peninsula in the later 20th century has caused widespread changes in the cryosphere (ice and snow) and terrestrial ecosystems. These recent changes along with longer-term climate and ecosystem histories will be deciphered using peat deposits. Peat accumulation can be used to assess the rate of glacial retreat and provide insight into ecological processes on newly d

NASA Earthdata CMR2022 · collection

The thermochemical structure of the lithosphere beneath Antarctica is fundamental for understanding the geological evolution of the continent and its relationship to surrounding Gondwana continents. In addition, the thermal structure controls the solid earth response to glacial unloading, with important implications for ice sheet models and the future of the West Antarctic Ice Sheet. However, it i

NASA Earthdata CMR2021 · collection

Age-depth and geochemical data for a 2000 year lake sediment record from an unnamed lake on Macquarie Island. The lake is the small lake to the west of Major Lake, on the edge of the Macquarie Island plateau. The chronology is based on lead-210 (last ca. 100 years) and radiocarbon (extending to ca. 2000 years). Geochemistry is based on micro x-ray fluroescence, and carbon, nitrogen and sulphur con

NASA Earthdata CMR2021 · collection

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). The spatial extent of the West Antarctic Ice Sheet during the last interglacial period (129,000 to 116,000 years ago) is currently unknown, yet this information is fundamental to projections of the future stability of the ice sheet in a warming climate. Paleoclimate records and proxy evidence su

NASA Earthdata CMR2021 · collection

Isotopic and sedimentary datasets reveal that volcanic activity typically increases during interglacial periods. However, the physical mechanisms through which changes in the surface loading affect volcanic magmatic plumbing systems remain unconstrained. Recently generated 40Ar/39Ar eruption ages indicate that 86% of the dated samples from Mt. Waesche, a late Quaternary volcano in Marie Byrd land,

NASA Earthdata CMR2021 · collection

This dataset lists samples of carbonate crusts formed under the ice of the East Antarctic Ice Sheet. These crusts mostly consist of Calcium Carbonate (CaCO3), and have ages spanning from older than 400,000 years to circa 17,000 years. The dataset "samples" provides the name for each specimen, where it was collected (Geographic Coordinates), its mineralogical composition and where the samples are a

NASA Earthdata CMR2021 · collection

Marine sediments often represent an important reservoir of carbonate minerals that will react rapidly to changing seawater chemistry as a result of ocean acidification. Ocean acidification (the reaction of CO2 with seawater) lowers the saturation state with respect to carbonate minerals and may lead to dissolution of these minerals if undersaturation occurs. There are three main carbonate minerals

NASA Earthdata CMR2021 · collection

Reconstructed sea spray and minerogenic data for a 12,000 year lake sediment record from Emerald Lake, Macquarie Island. Proxies are based on biological (diatoms) and geochemical (micro x-ray fluorescence and hyperspectral imaging) indicators. Data correspond to the figures in: Saunders et al. 2018 Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing. Na

NASA Earthdata CMR2020 · collection

This dataset file is unpublished. Details of analytical methods: U-Pb from Daczko et al. (2018) and Lu-Hf from Halpin et al. (2020). U-Pb analysis was via SHRIMP following procedure outlined in Daczko et al. (2018). Zircon grains were hand-picked and mounted into a 25-mm diameter epoxy resin disc along with grains of reference zircons BR266 (559 Ma, 909 ppm U; Stern and Amelin, 2003) and OGC-1 (34

NASA Earthdata CMR2020 · collection

These dataset files (2 tables) are supplementary material to: Halpin, J.A., Daczko, N.R., Direen, N.G., Mulder, J.A., Murphy, R.C., Ishihara, T., 2020. Provenance of rifted continental crust at the nexus of East Gondwana breakup. Lithos 354-355. https://www.sciencedirect.com/science/article/pii/S0024493719305237?via%3Dihub https://doi.org/10.1016/j.lithos.2019.105363 They include: Supplementary Ta

NASA Earthdata CMR2020 · Archive

. ______________________________________________________________________________________________________________ Part I: Nontechnical Description Scientists study the Earth's past climate in order to understand how the climate will respond to ongoing global change in the future. One of the best analogs for future climate might the period that occurred approximately 3 million years ago, during an i

NASA Earthdata CMR2020 · Text

Predictions of future sea level rise require better understanding of the changing dynamics of the Greenland and Antarctic ice sheets. One way to better understand the past history of the ice sheets is to obtain records from inland ice for past geological periods, particularly in Antarctica, the world's largest remaining ice sheet. Such records are exceedingly rare, and can be acquired at volcanic

NASA Earthdata CMR2020 · collection

This project developed sediment provenance proxies to trace the sources of sediment discharged by the WAIS to the continental rise. The WAIS erodes sediments from various West Antarctic geologic terranes that are deposited in adjacent drift sites. The geochemistry and magnetic properties of drift sediments reflect the tectono-metamorphic history of their source terranes. Deglaciation of a terrane

NASA Earthdata CMR2020 · collection

The data consists of an excel workbook with five sheets; 1. Location and mineralogy of samples of salt taken from the land surface. 2. Location and elemental composition of aqueous extracts taken from surface sediments, on a 1 x 1 km grid. 3. Weathering criteria (frost cracks, glacial polish, tafoni, wind pits, sand accumulations) on a 1 x 1 km grid. 4. Glacial sediment grain size statistics, from

NASA Earthdata CMR2019 · collection

Subduction takes place at convergent plate boundaries and involves sinking of one tectonic plate underneath another. Although this process is a key aspect of plate tectonics that shapes the planet over geologic time, and is a primary cause of earthquakes, it is not known what causes subduction to cease, and what effect it has on the deepest portions of the crust and the upper part of the mantle. B

NASA Earthdata CMR2019 · collection

These dataset files (2 appendices, 4 figures, 2 tables) are supplementary material to: Mulder, J.A., Halpin, J.A., Daczko, N.R., Orth, K., Meffre, S., Thompson, J.M., Morrissey, L.J., 2019. A Multiproxy provenance approach to uncovering the assembly of East Gondwana in Antarctica. Geology 47, 645-649. https://doi.org/10.1130/G45952.1 https://pubs.geoscienceworld.org/gsa/geology/article/47/7/645/57