cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a2hm52m76
title: MCD64A1 v006 MODIS/Terra+Aqua Burned Area Monthly L3 Global 500 m SIN Grid

description: The Terra and Aqua combined MCD64A1 Version 6 Burned Area data product is a monthly, global gridded 500 meter (m) product containing per-pixel burned-area and quality information. The MCD64A1 burned-area mapping approach employs 500 m Moderate Resolution Imaging Spectroradiometer (MODIS) Surface Reflectance imagery coupled with 1 kilometer (km) MODIS active fire observations. The algorithm uses a burn sensitive Vegetation Index (VI) to create dynamic thresholds that are applied to the composite data. The VI is derived from MODIS shortwave infrared atmospherically corrected surface reflectance bands 5 and 7 with a measure of temporal texture. The algorithm identifies the date of burn for the 500 m grid cells within each individual MODIS tile. The date is encoded in a single data layer as the ordinal day of the calendar year on which the burn occurred with values assigned to unburned land pixels and additional special values reserved for missing data and water grid cells.
 The data layers provided in the MCD64A1 product include Burn Date, Burn Data Uncertainty, Quality Assurance, along with First Day and Last Day of reliable change detection of the year.
 Giglio, L., Justice, C., Boschetti, L., Roy, D. (2015). &lt;i&gt;MCD64A1 MODIS/Terra+Aqua Burned Area Monthly L3 Global 500m SIN Grid V006&lt;/i&gt; [Data set]. NASA EOSDIS Land Processes Distributed Active Archive Center. Accessed 2024-12-10 from https://doi.org/10.5067/MODIS/MCD64A1.006
DOI: 10.18739/a2hq3s13m
title: Clyde Foreland Lake, Nunavut CO2 Concentration and d14C Data over the past 12.5 kiloannum

description: Recent anthropogenic warming in the Arctic has caused accelerated permafrost thaw, leading to the export of relict organic carbon (OC) to the atmosphere and surrounding depositional environments. Past episodes of warmth exceeding pre-industrial temperatures, such as the Holocene Thermal Maximum (HTM; 11 to 8 kiloannum (ka) at our study site), may serve as an analogue for how the Arctic carbon cycle responds to ongoing warming. We reconstructed accumulation rates of three OC endmembers (contemporaneous aquatic biomass, postglacial soil, and MIS 5 soil) at Lake CF8, northeastern Baffin Island, during the 12.4 kyr (kiloyear) since local deglaciation. We characterized OC endmembers and downcore sediment mixtures using Ramped Pyrolysis/Oxidation (RPO), radiocarbon (14C) age offsets between bulk sediment and macrofossils, and stable carbon isotopes (δ13C). We modeled endmember contributions to the lake sediment using the Bayesian mixing framework, MixSIAR. RPO revealed similar patterns between OC volatilization and pyrolysis temperature indicating minimal OC degradation between source and sink. Endmember OC accumulation rates, accounting for MixSIAR results, sedimentation, and total OC content, showed that mean postglacial soil inputs to Lake CF8 were greatest between 11.9 and 9.0 ka, 1.5 times greater than the rest of the record. This period coincided with regional peak Holocene summer temperatures (up to 5 °C (celsius) warmer than the pre industrial average), despite having low 14C age-offsets. Since modern Arctic temperatures have already warmed by 2-3 °C, similar to the HTM, regional permafrost may be mobilized at the same rates that we estimate for the early Holocene.
DOI: 10.18739/a2j09w62z
title: Turbulent flux measurements of carbon dioxide and methane from the 10m tower at the MetCity ice camp site during the 2019-2020 MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) expedition

description: These are the turbulent flux results for CO2 and CH4 measured from the 10m tower located at the MetCity ice camp site during the MOSAiC expedition, from October 2019 to October 2020. Instrumentation on the MetCity tower included: 3-D ultrasonic anemometers (Metek model uSonic-Cage MP) at 2, 6, and 10m heights; a Licor 7500DS open path water vapor sensor at the 2m level; bulk temperature and relative humidity at 2, 6, and 10m levels, and surface pressure, among other things. Results are hourly means, filtered for optimal conditions. A full description of the flux calculations, filtering and averaging procedures, and variable definitions is provided in an associated readme document.
DOI: 10.18739/a2j678z6m
title: Cell Recoverability and Metabolism of Colwellia psychrerythraea at a Range of Subzero Temperatures, Salinities, and Nutrients During Long Term Incubations, 2018

description: Liquid water is essential to life as we know it, yet most planets and moons in our solar system have surface temperatures well below the freezing point of pure water. As part of an effort to identify potential biosignatures and biosignature targets for upcoming space-exploration life detection missions, the marine psychrophile Colwellia psychrerythraea 34H was incubated in subzero brines and supercooled sea water under eight conditions with varying subzero temperatures, salinities and nutrient additions. This is the raw cell data for culturability, cell abundance, and proteomic signatures - as published in Mudge et al., 2021 (https://doi.org/10.1111/1462-2920.15485). This research was undertaken at the Applied Physics Laboratory at the University of Washington, Seattle in 2018.
DOI: 10.18739/a2j960c0f
title: Arctic Dynamic Ocean Topography (DOT) Buoy Data, Beaufort Sea & Laptev Sea (2019-2024)

description: We have developed for deployment in ice-covered seas Dynamic Ocean Topography (DOT) Buoys which make precise measurements of sea surface height (SSH) and precipitable water vapor (PWV) content. Our motivation is to improve measurements of DOT, the departure of sea surface height from the height of the geoid time-invariant geopotential surface (e.g., the EGM-2008 model). The spatial gradient of DOT is the sea surface tilt that drives surface geostrophic current. Satellite altimeters such as CryoSat-2, ICESat-2, and SWOT measure DOT, but they require ground truth observations for calibration and validation. These are difficult anywhere, but in ice-covered oceans they have been nonexistent. We have developed the DOT buoys to fill this gap.
 The methodology is in principle very simple, that is to measure the height of a drifting buoy with a precise Global Positioning System (GPS) receiver and the changes in height of the buoy relative to the water surface with a pressure sensor at the bottom of the buoy. The major components of the buoys include the dual channel GPS receiver and the Iridium transmitter receiver, which is used for transmission of the full GPS data including phase of the carrier frequencies. In addition, the buoys have a pressure sensor at the bottom of the buoy hull for determination of the GPS antenna freeboard, tilt and heading sensors, and atmospheric pressure and temperature sensors. To conserve power, we typically sample GPS data at 30-second intervals but on a duty cycle of for example 2 days on and 5-days off. The GPS data have been processed by Bruce Haines at Jet Propulsion Laboratory (JPL) using GYPSY Precise Point Positioning (PPP). The dual frequencies allow determination of the position error due to wet tropospheric delay. PPP uses GPS data from a worldwide array of receivers fixed to bedrock to determine the GPS satellite clock and ephemerae errors that are the other main source of position errors. This results in accuracies of SSH measurement approaching 1-centimeter (cm). The wet tropospheric delay measurement when multiplied by -0.18 is approximately the precipitable water vapor content (PWV) of the atmosphere. All the GPS-derived parameters, the buoy orientation measurements where available, the met measurements, buoy draft pressure, and initial GPSS antenna freeboard, and the constant GPS phase center height above the GPS antenna base are included in the data submission.
DOI: 10.18739/a2jh3d45m
title: Cell Recoverability and Metabolism of Three Extremophiles During Long Term Sub-Zero Incubations, 2019-2020

description: Liquid water is essential to life as we know it, yet most planets and moons in our solar system have surface temperatures well below the freezing point of pure water. As part of an effort to identify potential biosignatures and biosignature targets for upcoming space-exploration life detection missions, three strains of psychrophilic bacteria with varying salinity tolerances were incubated at -5, -10, and -36 degrees Celsius [°C] for long-term (12 month) laboratory incubations. Organisms were examined for observable cells, metabolic activity, and recoverability regularly over the course of this incubation. This dataset includes the raw data as well as calculated metabolic activity rates. This research was undertaken at the Applied Physics Laboratory at the University of Washington, Seattle between 2019 and 2020.
DOI: 10.18739/a2jh3d463
title: Post-fire carbon and energy flux and meteorological data from Scotty Creek, Northwest Territories from 2023-2024

description: Fire is on the rise in the arctic boreal region and thus it is important to understand the impacts on ecosystem function post-fire. With permafrost thaw, understanding how fire impacts ecosystems in the permafrost region is vital to understand feedbacks from fire and permafrost thaw and how these ecosystem disturbances interact with each other. Here, we had a unique opportunity from an unfortunate even where a fire burned down and long-term research site in the Northwest Territories, Canada in October of 2022. With the funding from the NSF RAPID award, we quickly rebuilt the eddy covariance tower and published a first of its kind dataset of carbon (carbon dioxide (CO2) and methane (CH4)) and energy fluxes, before and after fire and the same exact location.
DOI: 10.18739/a2jm23h9d
title: Soil Moisture and Ocean Salinity (SMOS)-CryoSat L4 Sea Ice Thickness, Version 206

description: The SMOS-CryoSat merged Sea Ice Thickness Level 4 product, in NetCDF format, is based on estimates from both the MIRAS and the SIRAL instruments with a significant reduction in the relative uncertainty for the thickness of the thin ice.
 A weekly averaged preliminary product is generated every day by the Alfred Wegener Institut (AWI) by merging the weekly CryoSat Sea Ice Thickness product and the daily SMOS Sea Ice Thickness retrieval. A final product is provided with a latency of about 3-4 weeks using a different global sea ice concentration product and a reprocessed CryoSat product.
 European Space Agency, 2023, SMOS-CryoSat L4 Sea Ice Thickness, Version 206.
DOI: 10.18739/a2jq0sx2z
title: Dissolved Organic Carbon in the Arctic Ocean and Organic Alkalinity in Sea Ice Brine from ARTofMELT 2023

description: While total alkalinity is traditionally attributed to dissolved inorganic constituents, dissolved organic matter (DOM) can significantly contribute to total alkalinity, introducing errors in carbonate parameter calculations such as calcium carbonate (CaCO3) saturation state (Ω) and partial pressure of carbon dioxide (CO2) (pCO2). Accurately quantifying organic alkalinity (OrgAlk) is particularly crucial in the rapidly changing Arctic. The data presented here is aimed at discerning the presence of OrgAlk in the Arctic Ocean and assesses its influence on carbonate speciation.
 This data was collected 7 May - 15 June on the ARTofMELT expedition aboard I/B Oden vessel in the eastern Central Arctic Ocean, primarily in the Fram Strait region. The overall expedition was focused on atmospheric rivers and meteorology, but this data set is from the chemical oceanography group aimed at understanding the inorganic carbon system within sea ice and the underlying water throughout the onset of a melt season. This data includes the dissolved organic carbon concentrations, organic alkalinity contribution (both directly measured via back-titrations and calculated via CO2SYS with pH and dissolved inorganic carbon data), and calculated carbonate parameters (pCO2, pH, and CaCO3 saturation states) depending on the inclusion or omission of the organic alkalinity component
DOI: 10.18739/a2js9h954
title: Oblique Geotagged Photos From Aerial Beaver Surveys in the Central Brooks Range, Alaska, 01 July 2024

description: The Arctic Beaver Observation Network (A-BON): Tracking a new disturbance regime project observes beaver engineering across circumarctic treeline and tundra environments during the last half-century by mapping and tracking beaver ponds using remote sensing imagery. Oblique, geotagged aerial photos are being acquired to establish a baseline of the presence/absence of beavers in prominent river valleys of the Central Brooks Range in Alaska. On 01 July 2024, we contracted with Coyote Air out of Coldfoot on a ~4 hour flight through the North Fork of the Koyukuk, Alatna, and John Rivers. The Cessna 185 flew around 1500 to 2000 feet above ground level while a Digital Single-Lens Reflex (DSLR) Nikon camera connected to a Global Positioning System (GPS). We focused on capturing images of waterbodies that were later used to determine the apparent presence/absence of beavers along the flight route. A KMZ file was created with the geotagged photos and is included in this dataset here. We have also identified the apparent presence/absence of beaver activity (dam, lodge, etc.) in each frame and included this a geojson file and an interpreted map image.
DOI: 10.18739/a2js9h96m
title: Seabed grain-size data from Harrison Bay (Beaufort Sea continental shelf), Alaska, 2019-2022

description: This file contains grain-size data from seabed shipek grab samples collected from R/V Sikuliaq and its workboat in 2019 and 2020 and R/V Ukpik in 2021 and 2022. Samples were collected from across Harrison Bay on the Alaskan Beaufort Shelf, north of the Colville River and between Oliktok Point and Cape Halkett. A few samples were collected farther east. Samples were collected using a shipek grab sampler or miniature hand-operated van veen sampler. In 2019, samples were collected in October-November. In 2020, samples were collected in September. In 2021, samples were collected in July-August. In 2022, samples were collected in August-September. Samples were bagged in the field and returned to the lab (at University of North Carolina-Chapel Hill or Oregon State University) where grain-size analyses were performed using an Escitec Bettersizer S3Plus laser diffraction sensor (the same sensor was used for all samples) Samples were sonicated for two minutes prior to analyses. Samples ranged from well sorted sands (typically medium sand or fine) to poorly sorted bimodal sands and muds to unimodal muds. In the field, samples exhibited diverse textures including mud clasts and very stiff muds.
DOI: 10.15468/dl.p44nby
title: Occurrence Download

description: A dataset containing 36448 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "TaxonKey is Streptomyces Waksman & Henrici, 1943"
 ]
}

 The dataset includes 36448 records from 425 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016843-250525065834625/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2jw86p8f
title: Terminus Ablation Rates for the Glaciers in Kalaallit Nunaat (Greenland) from 2013 to 2023

description: The marine-terminating glaciers on Kalaallit Nunaat (Greenland) have undergone accelerated mass loss since the 1990s, with a substantial portion due to the effects of dynamic ice loss. Conventional assessments of dynamic mass loss, however, often ignore the influence of terminus change on the timing of mass loss from the terminus. Here we construct and analyze a decadal (2013--2023) record of monthly ice flux driven both by temporal variability in ice flow (i.e., discharge) and terminus position change -- collectively called terminus ablation -- for 49 marine-terminating glaciers in Greenland. We calculate terminus ablation rates using open-source datasets of terminus position, surface elevation, ice thickness, and glacier speed in order to facilitate the extension of the terminus ablation time series as more data become available. During 2013--2023, we observe coincident seasonal variations in terminus position and discharge that produce a pronounced summer peak in terminus ablation. However, for 8 glaciers we find that the terminus ablation time series has more erratic seasonality than would be estimated from discharge alone. Additionally, 4 glaciers exhibited seasonality superimposed on large inter-annual fluctuations likely due to surging or disappearance of floating tongues. At regional scales, the magnitude of seasonal oscillations in terminus ablation are much larger than discharge: for the northwest and central west sectors, where the fraction of outlet glaciers included in our estimates is greatest, seasonal oscillations in terminus ablation are ~45 gigatonnes per year (Gt/yr) and ~25 Gt/yr, respectively, compared to less than 10 Gt/yr for discharge. Our terminus ablation time series do not include every outlet glacier, but they suggest that terminus position change is the dominant contributor to dynamic mass loss at seasonal time scales, in contrast with its decadal-scale contributions. Since seasonality in mass loss from Greenland can influence the fate of meltwater, it is essential that future research on the ocean impacts of Greenland mass loss account for seasonal terminus position change.
DOI: 10.18739/a2k35mg41
title: Thermal State of Permafrost in North America - continuously observed ground temperatures, Canada & United States, 2023-2024

description: This work coordinates data collection using standard equipment and protocols at North American and Russian sites. These data sets provide the baseline to assess the future rates of change in near-surface permafrost temperatures and permafrost boundaries, and to provide spatial data for validation of climate scenario models and temperature reanalysis approaches. The work represents the United States (US) contribution to the ongoing activities of the Global Terrestrial Network for Permafrost that obtains temperatures in a large number of globally distributed monitoring sites in order to provide a snapshot of permafrost temperatures in both time and space.
 The US National Science Foundation (NSF) funded this work with award #0520578, #0632400, #0856864, and #1304271.
DOI: 10.18739/a2kd1qn3m
title: Northern Baffin Bay sediment core evidence for Boothia-Lancaster Ice stream retreat from Last Glacial Maximum extent and for its role in the origin of Baffin Bay Detrital Carbonate (BBDC) Events 0, 1 and 2 (2019-2024)

description: This dataset is an update and extension of data lodged at this site under doi:10.18739/A2GM81Q31 and stemming from Kelleher et al., 2022 published in Arctic, Antarctic and Alpine Research, vol. 54, no 1, p. 395-347, doi.org/10.1080/15230430.2022.2110689. This updated data include new age models, additional foraminiferal assemblage data, and new X-Ray fluorescense (XRF) data on the 3 sediment cores. The goal of the continued research is to document the retreat history of the trunk ice stream in Lancaster Sound, the Boothia-Lancaster ice stream (BLIS) and to relate this Last Glacial Maximum (LGM) to Holocene history with deposition of the Baffin Bay Detrital Carbonate (BBDC) events. The new foraminiferal data are used to constrain the paleoenvironments, and with new radiocarbon dates we have new understanding of the lithofacies which have unified the age models and the origin of BBDC events in cores throughout Baffin Bay (Jennings et al., 2025). The dataset also includes Inductively Coupled Plasma Mass Spectrometry (ICP-MS) trace metal data on N. pachyderma exploring geochemical evidence of inflow of Pacific-sourced Arctic Surface Water as Parry Channel and Nares Strait opened by deglaciation, a manuscript in preparation by Marchitto and others on the same set of sediment cores.
DOI: 10.18739/a2kh0f15v
title: Wetland greenhouse gas flux responses to experimental flooding and warming, Yukon-Kuskokwim Delta (Western Alaska, USA), 2022-2023.

description: This dataset was used to answer the question: how do flooding and warming alter carbon dioxide and methane flux from coastal wetlands of the Yukon-Kuskokwim (Y-K) Delta (Western Alaska, USA)? Over two years, we simulated periodic summer tidal flood events at two severity levels and passively increased summer temperatures in a full-factorial field experiment, and the response of gas measured the response of carbon dioxide and methane fluxes. We simulated low-severity and high-severity flooding to represent near-future flooding regimes for the Y-K Delta, projected respectively in the next ~5 and ~10 years. The experiment was established in a wet sedge-shrub meadow, an ecotype covering greater than 10% of the vegetated area of the central coast of the Y-K Delta. We measured gas fluxes approximately twice per week using static chambers during the summer of 2023.
DOI: 10.18739/a2kk94f06
title: Greenland Ice Sheet solid ice discharge from 1986 through last month: Gates

description: We present a 1986 through March 2020 estimate of Greenland Ice Sheet ice discharge. Our data include all discharging ice that flows faster than 100 m yr−1 and are generated through an automatic and adaptable method, as opposed to conventional handpicked gates. We position gates near the present-year termini and estimate problematic bed topography (ice thickness) values where necessary. In addition to using annual time-varying ice thickness, our time series uses velocity maps that begin with sparse spatial and temporal coverage and end with near-complete spatial coverage and 12 d updates to velocity. The 2010 through 2019 average ice discharge through the flux gates is  ~487 +/- 49 Gt yr−1. The 10 % uncertainty stems primarily from uncertain ice bed location (ice thickness). We attribute the ∼50 Gt yr−1 differences among our results and previous studies to our use of updated bed topography from BedMachine v3. Discharge is approximately steady from 1986 to 2000, increases sharply from 2000 to 2005, and then is approximately steady again. However, regional and glacier variability is more pronounced, with recent decreases at most major glaciers and in all but one region offset by increases in the northwest region through 2017 and in the southeast from 2017 through March 2020. As part of the journal's living archive option and our goal to make an operational product, all input data, code, and results from this study will be updated as needed (when new input data are available, as new features are added, or to fix bugs) and made available at https://doi.org/10.22008/promice/data/ice_discharge (Mankoff, 2020a) and at https://github.com/mankoff/ice_discharge (last access: 6 June 2020, Mankoff, 2020e).
 Mankoff, Ken; Hillerup, Signe, 2020, "Greenland Ice Sheet solid ice discharge from 1986 through last month: Gates", https://doi.org/10.22008/promice/data/ice_discharge/gates/v02, GEUS Dataverse, V6
DOI: 10.15468/dl.mk784w
title: Occurrence Download

description: A dataset containing 50129 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasGeospatialIssue is false",
 "HasCoordinate is true",
 "OccurrenceStatus is Present",
 "BasisOfRecord is one of (Human Observation, Machine Observation, Occurrence evidence, Observation)",
 "TaxonKey is one of (Terrapene carolina (Linnaeus, 1758))",
 "Country is one of (Bermuda, Canada, Greenland, Saint Pierre and Miquelon, United States of America)"
 ]
}

 The dataset includes 50129 records from 13 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016837-250525065834625/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.