20 datasets

NASA Earthdata CMR + NASA Data Portal2024 · Image data

This dataset provides dissolved carbon dioxide (CO2) and methane (CH4) concentrations alongside their stable and radiocarbon isotopic compositions within the Arctic Sagavanirktok and Kuparuk River watersheds located on the North Slope of Alaska. The data were collected during the spring, fall, and summer seasons in 2022. In field separation of the bulk gaseous components (N2, CO2, and CH4) from th

NASA Earthdata CMR + NASA Data Portal2024 · Image data

This dataset holds measures of vegetative cover and soil characteristics for sites in interior Alaska, U.S., along the James W. Dalton Highway (Alaska Route 11). The field data were collected during August in 2018 and 2019 to study the expansion of shrub cover, particularly alders (Alnus spp.) in tundra ecosystems and the potential impact of shrubs on soil properties. Samples were measured along t

NASA Earthdata CMR + NASA Data Portal2023 · Image data

This dataset contains properties of soil core samples for herbaceous wetlands collected in the Atchafalaya and Terrebonne basins in southeastern coastal Louisiana for the period 2021-03-21 to 2021-04-02 and on 2021-08-19. Field measurements were conducted at six sites in the Atchafalaya (N = 3) and Terrebonne (N = 3) basins. Five sites were adjacent to sites from the Coastwide Reference Monitoring

NASA Earthdata CMR + NASA Data Portal2023 · Image data

This dataset contains foliar tissue C and N bulk isotopic signatures (delta 13C, delta 15N) of dominant wetland herbaceous species collected at six sites in the Atchafalaya (N = 3) and Terrebonne (N = 3) basins in coastal Louisiana. Five of the sites are from the Coastwide Reference Monitoring System (CRMS) and one site is the Mike Island Site in the Wax Lake Delta (WLD). For the herbaceous wetlan

NASA Earthdata CMR2021 · collection

Midwater fish nitrogen isotope data from the Kerguelen Axis ecosystem study (AAS_4344): These data are based on samples collected as part of the Kerguelen Axis marine ecosystem study (AAS_4344), chief scientist Andrew Constable. This research was supported by the Australian government under the (i) Cooperative Research Centre Program through the Antarctic Climate and Ecosystems Cooperative Researc

NASA Earthdata CMR2020 · collection

The water isotope (d18O) record for the "DSS" (Dome Summit South) Law Dome ice core. Law Dome water isotope record spans 90kyr and this data was computed from average isotopes with 20 year averaging. The d18O measurements were completed using Isotope Ratio Mass Spectrometers. Drilling of the DSS ice core commenced in 1987/88 Australian Antarctic program season and was completed in 1992/93. The DSS

NASA Earthdata CMR2020 · collection

The DSS1314_Glacial isotopic composition_DMP_submit.xlsx is the measured oxygen and deuterium isotopic data for the "DSS" (Dome Summit South) Law Dome ice core (DSS1314) collected during the Antarctic 13/14 season. Column descriptions: Core: Ice core identifier Sample Name: Sample identifier Sample Top Depth (m): Measured top depth (m) of sample Sample Bottom Depth (m): Measured bottom depth (m) o

NASA Earthdata CMR2020 · collection

The DSS1516_Glacial isotopic composition_DMP_submit.xlsx is the measured oxygen and deuterium isotopic data for the "DSS" (Dome Summit South) Law Dome ice core (DSS1516) collected during the Antarctic 15/16 season. Column descriptions: Core: Ice core identifier Sample Name: Sample identifier Sample Top Depth (m): Measured top depth (m) of sample Sample Bottom Depth (m): Measured bottom depth (m) o

NASA Earthdata CMR2020 · collection

The DSS1415_Glacial isotopic composition_DMP_submit.xlsx is the measured oxygen and deuterium isotopic data for the "DSS" (Dome Summit South) Law Dome ice core (DSS1415) collected during the Antarctic 14/15 season. Column descriptions: Core: Ice core identifier Sample Name: Sample identifier Sample Top Depth (m): Measured top depth (m) of sample Sample Bottom Depth (m): Measured bottom depth (m) o

NASA Earthdata CMR2019 · collection

Carbon and nitrogen stable isotope data for a range of benthic invertebrates, macroalgae, phytoplankton, sea ice algae and fish from shallow marine coastal region around Davis Station. Part of the TRENZ program (The TRophic Ecology of the antarctic Nearshore Zone: local and global constraints on patterns and processes), and AAS project 2948.

NASA Earthdata CMR2019 · collection

Here we use oxygen, carbon and boron isotopes, and planktonic foraminiferal shell weights in planktonic foraminifera and an alkenone-based proxy of temperature to reconstruct seawater pH and CO2 partial pressure in sub-Antarctic surface waters south of Tasmania over the past 25,000 years Glacial–interglacial changes in atmospheric CO2 are generally attributed to changes in seawater carbon chemistr

NASA Earthdata CMR2019 · collection

Water samples of 1 to 2L from Niskin bottles filled close to the surface, mid mixed layer depth and bottom of the mixed layer were drawn cleanly through a 210um mesh to exclude zooplankton. All samples were filtered as two size fractions, 1.2 to 20um (larger particles excluded by 20um Nitex mesh) and a separate 1.2 to 210um total sample. The filters were 1.2um silver membranes (Sterlitech) 13mm di

NASA Earthdata CMR2019 · collection

This data features stable carbon and nitrogen isotopes of co-occurring Southern Ocean pteropods in order to estimate and compare their Bayesian isotopic niches. Other data includes station number, latitude and longitude, species names and sample ID. Details for each column are as follows: A: "species" - Species analysed including, "clio" = Clio pyramidata f. sulcata; "clione" = Clione limacina ant

NASA Earthdata CMR + NASA Data Portal2017 · Image data

This data set provides a 30-year record of Landsat TM and ETM+ derived forest phenology and the results of tree ring analyses for annual wood production and nitrogen and carbon isotopic composition at 113 selected forested sites in the eastern United States. The sites are located in four national parks: Prince William Forest Park (PRWI), Harpers Ferry National Historical Park (HAFE), Catoctin Moun

NASA Earthdata CMR2016 · collection

Increased aridity is of global concern. Polar regions provide an opportunity to monitor changes in bioavailable water free of local anthropogenic influences. However, sophisticated proxy measures are needed. We explored the possibility of using stable carbon isotopes in segments of moss as a fine-scale proxy for past bioavailable water. Variation in delta 13C with water availability was measured i

NASA Earthdata CMR2013 · collection

The LD2012-d18O-Native-age record is the annual mean water isotope (d18O) record for the "DSS" (Dome Summit South) Law Dome ice core with extensions (e.g. As described in van Ommen et al., Nature Geoscience, 2010) from overlapping ice cores which are dated by comparing multiple chemical species as well as water isotopes. LD2012-d18O-Native-age record spans 2007 A.D. to 174 A.D. The d18O measuremen

NASA Earthdata CMR + NASA Data Portal2011 · Image data

This data set reports the results of carbon, nitrogen, and oxygen isotopic analyses of soil, soil water, and N2O soil gas samples; total soil carbon and nitrogen concentrations; and soil texture and bulk density. Samples were collected from the km 83 Logged Forest Tower Site and the km 67 Seca-Floresta Site in the Tapajos National Forest (TNF) near Santarem, Para, Brazil. Soil samples were collect

NASA Earthdata CMRcollection

Project Objectives 1) To describe trophic relationships in near shore marine benthic ecosystems of East Antarctica and determine the importance of environmental forces (such as sea ice and primary production) to the structure of food webs and biological interactions in benthic assemblages. 2) To determine how marine benthic food webs in East Antarctica respond to local scale disturbances (such as

NASA Earthdata CMRcollection

Data set includes U-Pb zircon geochronological data for Ferrar Supergroup (Ferrar Dolerite, Kirkpatrick Basalt) rocks from the Transantarctic Mountains which were collected over several Antarctic field seasons (between 1966 and 2011) by David H. Elliot (Ohio State University)and Thomas H. Fleming (Southern Connecticut State University). The geochronological data were acquired by Seth Burgess and S

NASA Earthdata CMRExcel spreadsheet

This dataset consists of: (1) a suite of sedimentary rocks (primarily sandstones, with subordinate mudstones, conglomerates, glauconites and volcanic ashes) collected from Cretaceous through Paleogene strata of the Larsen basin, Antarctic Peninsula, and (2) geochronology and geochemistry data from some of the aforementioned samples. The collection and analysis of samples in this growing database w