cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a22j68631
title: Sea Ice Index: ice cover and trends in ice cover in the Arctic and Antarctic oceans, Version 3, 1978-present

description: The Sea Ice Index provides a quick look at Arctic- and Antarctic-wide changes in sea ice. It is a source for consistent, up-to-date sea ice extent and concentration images, in PNG format, and data values, in GeoTIFF and ASCII text files, from November 1978 to the present. Sea Ice Index images also depict trends and anomalies in ice cover calculated using a 30-year reference period of 1981 through 2010.
 The images and data are produced in a consistent way that makes the Index time-series appropriate for use when looking at long-term trends in sea ice cover. Both monthly and daily products are available. However, monthly products are better to use for long-term trend analysis because errors in the daily product tend to be averaged out in the monthly product and because day-to-day variations are often the result of short-term weather.
 Fetterer, F., K. Knowles, W. N. Meier, M. Savoie, and A. K. Windnagel. 2017, updated daily. Sea Ice Index, Version 3. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.7265/N5K072F8. 13 Nov 2020.
DOI: 10.18739/a22j6864h
title: Summary Report: Greenland Science Meeting at the 2024 Fall AGU Meeting

description: The Greenland Ice Sheet Ocean Science Network (GRISO) organized an informal meeting during the Fall 2024 American Geophysical Union (AGU) Meeting that brought together an interdisciplinary and international group of researchers, government scientists, funding agencies, and representatives from Greenland. The goals of the meeting were to 1) facilitate interactions across individuals and groups that conduct and support research in and around Greenland (including Greenland Ice Ocean Science Network [GRISO], Future of Greenland ice Sheet Science [FOGSS], funding agencies, and more) and 2) promote discussion of how to best contribute to Greenland's National Research Strategy. We asked attendees to provide constructive feedback to the following questions:
 1) Supporting capacity building for Greenland-led research is an important goal. How can we (individuals, organizations, etc.) best participate in capacity building? The more detailed or specific your suggestions or comments are, the more helpful!
 2) What do you most want, what would be most helpful, and/or what is missing from a coordinated US domestic and/or international effort in Greenland? Again, the more detailed or specific your suggestions or comments are, the more helpful!
 3) Please provide any ideas, questions, interests, or other things for the community to connect about. This is a catch all topic, but detail is helpful here too.
 The written report provided here details attendees responses to these questions in summary form. There is also a list of the 46 participants, including Greenlanders and US funding agencies.
DOI: 10.15468/dl.ftxbs7
title: Occurrence Download

description: A dataset containing 0 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 (Coluber constrictor Linnaeus, 1758)",
 "Country is one of (Åland Islands, Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czechia, Denmark, Estonia, Faroe Islands, Finland, France, Germany, Gibraltar, Greece, Guernsey, Holy See, Hungary, Iceland, Ireland, Isle of Man, Italy, Jersey, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Republic of, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russian Federation, San Marino, Serbia, Slovakia, Slovenia, Spain, Svalbard and Jan Mayen, Sweden, Switzerland, Ukraine, United Kingdom of Great Britain and Northern Ireland)"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016827-250525065834625/datasets/export for details.
DOI: 10.18739/a22n4zk6z
title: Microbial community structure (DNA) and metabolic data (oxygen utilization) from Coastal Alaska during the 2023 Arctic Chief Scientist Training Cruise

description: These data were extracted from water samples collected from R/V Sikuliaq hydrographic stations during the 2023 University National Oceanographic Laboratory System (UNOLS) and Arctic Icebreaker Coordinating Committee (AICC) sponsored Arctic Chief Scientist Cruise. The primary goal of this program is to provide hands on training for early career researchers to gain skills and confidence in organizing and leading polar scientific research expeditions. The 2023 expedition (SKQ202309T; June 6–12) followed a coastal Alaska cruise track through the Aleutian Islands and across the Bering Sea. This dataset was specifically collected to provide a survey of microbial community composition and metabolic activity for this cruise transect. At eight stations, seawater microbial community composition was measured broadly using amplicon gene sequencing (16S/18S ribosomal ribonucleic acid (rRNA) gene and Synechcoccus internal transcribed spacer (ITS) region) and metagenomic sequencing (data available through the National Center for Biotechnology Information; NCBI BioProject ID PRJNA1240040). At three stations, oxygen utilization assays were additionally used to measure rates of net community production and community respiration (data provided here).
DOI: 10.18739/a22r3nz8s
title: GPS and Water Depth Measurements of the Thalweg of a Supraglacial Stream in Southwest Greenland, 2019

description: Presented here are the Global Positioning System (GPS) positions of the thalweg of a supraglacial stream in Southwest Greenland. This data was collected in order to determine the water surface slope of the stream in order to calculate the frictional slope for a HEC-RAS 2D hydrological model boundary condition. A slope of 0.00143 was found based on this data. The particular stream reach is located roughly 1 kilometer (km) from the ice edge outside of Kangerlussuaq and was selected due to it being one of the largest supraglacial streams within walking distance of a road. Flows in the stream varied between 0.2 and 1.0 cubic meters per second (m3/s) daily during the observation period (July 13th, 2019 to August 10th, 2019). The data was collected with a Trimble R7 Global Navigation Satellite System (GNSS) rover attached to a 2 meter pole. Points were collected every 3.0 meters on average successively downstream for a total distance of 1.4 km. Water depths at the given location were collected simultaneously using a meter and presented here. GPS measurements were corrected using a base station located 1 km west on bedrock. Measurements were for the author's PhD dissertation.
DOI: 10.18739/a22v2cc4k
title: Temperature data from Toolik Lake 2016-2018, North Slope, Alaska

description: Lakes are abundant in the terrestrial arctic, extending over about one quarter of the territory. For approximately nine months of the year, the waters of arctic lakes are under ice. Despite the duration of the ice-covered period, few studies have addressed the limnology (biological, chemical, and physical) features of these lakes during winter and how conditions under ice affects summer conditions and vice versa.
 Our research is being conducted in lakes studied by the Arctic Long Term Ecological Research (ARC LTER). The data are from Toolik Lake, North Slope, Alaska. We present here time series of water temperatures at several depths obtained from a taut-line mooring in different seasons (summer and winter) across multiple years (summer 2010 until spring 2012). The mooring is located at the main basin (approximately 24 meter depth).
DOI: 10.18739/a22z12r5x
title: Suspended and bed sediment grain size distributions at three riverine sites in the Yukon River Watershed: Alakanuk, Beaver, and Huslia (Alaska) (2018-2023)

description: To capture suspended sediment transport dynamics in the Yukon River basin, we measured suspended sediment concentrations as well as suspended and bed grain size distributions. We collected samples at three locations in the Yukon River Basin: Alakanuk, Alaska (AK) (62.685 North [N], 164.644 West [W]), Beaver, Alaska (66.362 N, 147.398 W), and Huslia, Alaska (65.700 N, 156.387 W). Near Huslia, samples were collected in 2018, 2022, and 2023. Near Beaver, AK, samples were collected in 2022 and 2023. Near Alakanuk, samples were collected in 2023. Spring sampling typically occurred days to weeks after river ice break-up. Fall sampling typically occurred weeks prior to river freeze-up. Suspended sediment was collected using a Van Dorn sampler and bed sediment was collected using a Ponar 'grab' sampler. Samples were carefully retrieved and dried for concentration determination. Then, samples were pre-treated prior to grain size analysis, following previously described protocols. Reported data include sediment grain size statistics, total sediment concentrations, sample depths, and heights above the riverbed.
DOI: 10.18739/a2348gj3x
title: eXpendable Conductivity Temperature Depth (XCTD) profiles of temperature and salinity from Sermilik Fjord during August 2011

description: Four temperature and salinity profiles from Sermilik Fjord in Southeast Greenland. The profiles were collected using Sippican XCTD-1 eXpendable Conductivity Temperature Depth (XCTD) probes deployed from a helicopter. The profiles were collected on August 26 2011 in the ice mélange region of the Helheim Glacier/Sermilik Fjord system. The profiles were manually examined, quality controlled, and are provided as 2-meter (m) depth bin averaged profiles. The collection of these XCTD profiles was done concurrently with a shipboard survey of Sermilik Fjord from August 15 - 25 2011. The shipboard CTD data are provided separately. These data were collected as part of a long-term project to monitor Sermilik Fjord to determine what water masses flow into and out of the fjord; in particular, if warm, Atlantic water from the Irminger Sea penetrates into the fjord and how freshwater from ice melt is diluted and transported out of the fjord. Observations have been collected in the fjord since 2008.
DOI: 10.18739/a23775x29
title: Relative cover of vegetation from a small mammal experiment from summer 2018-2023 near Toolik Lake Alaska

description: We conducted a manipulative experiment to quantify the impact of small mammal herbivores on the plant community of the tundra at three sites near Toolik Lake, Alaska. At each site we set up grazing fences in July of 2018 to simulate different levels of small mammal herbivore (vole and lemming) activity. Each site had 3 treatment plots and a control plot: 1) Exclosure treatments (EX) were 8 meter (m) x 8m square mesh fences 2) control plots (CT) were 8m x 8m unfenced plots marked with pin flags at corners 3) press treatments (PR) were 20m x 20m square mesh fences stocked with 4 tundra voles (Microtus oeconomus) every summer except for 2024 and 4) pulse treatments (PU) where we stocked the fence with 4 voles in 2018 and then removed and excluded voles from 2019 onward. At each site in each plot we collected relative abundance of plant species and ground cover in 8 1 square meter (m2) plots once each year (except in 2020).
DOI: 10.18739/a23j39319
title: Near-Real-Time Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager/Sounder (SSM/I-SSMIS) Daily Polar Gridded Brightness Temperatures, Version 2

description: The Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperature product provides near-real-time polar stereographic gridded daily brightness temperatures for both the Northern and Southern Hemispheres. Near-real-time daily brightness temperatures (Tb) data are produced daily from the Special Sensor Microwave Imager/Sounder (SSMIS) on board the Defense Meteorological Satellite Program (DMSP) satellites, and are gridded onto the polar stereographic grid.
 Meier, W. N., Wilcox, H., Scott, D. J., Stewart, J. S. &amp;amp; Calme, J. (2022). Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 2 [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/WKRY675MV57L. Date Accessed 06-24-2024.
DOI: 10.18739/a23j3932s
title: Discrete water samples collected from the Conductivity-Temperature-Depth (CTD) rosette at specific depths, Research Vessel Sikuliaq, Northern Bering Sea to Chukchi Sea, 2024

description: The Pacific sector of the Arctic Ocean is experiencing major reductions in seasonal sea ice extent and increases in sea surface temperatures. One of the key uncertainties in this region is how the marine ecosystem will respond to seasonal shifts in the timing of spring sea ice retreat and/or delays in fall sea ice formation. Variations in upper ocean water hydrography, planktonic production, pelagic-benthic coupling and sediment carbon cycling are all influenced by sea ice and temperature change. To more systematically track the broad biological response to sea ice retreat and associated environmental change, an international consortium of scientists have developed a coordinated Distributed Biological Observatory (DBO) that includes selected biological measurements at multiple trophic levels, along with satellite and mooring measurements. The DBO currently focuses on five regional biological "hotspot" locations along a latitudinal gradient that allows for consistent sampling and monitoring at five biologically productive locations across a latitudinal gradient: DBO 1 (SLIP)-south of St. Lawrence Island (SLI), DBO2 (Chirikov)-north of SLI, DBO3 (southern Chukchi Sea), DBO4-NE Chukchi Sea,and DBO5-Barrow Canyon.
DOI: 10.18739/a23t9d81t
title: Fortymile caribou herd range isopleths, occurrence distributions, and associated vegetation change data, Alaska and Yukon Territory (1991 - 2021)

description: We assessed the range characteristics of the Fortymile migratory caribou (Rangifer tarandus) herd in east-central Alaska and west-central Yukon Territory as it grew (1992-2017) then declined (2017-2020) to analyze whether range size, location and density changed over this time period. In addition, we assessed the correlation between caribou density and vegetation change over this time period using remotely sensed estimates of plant functional type fractional cover.
 This dataset provides: a) the Fortymile range isopleth data used to assess changes in range characteristics, b) the Forytmile range occurrence distributions used to analyze spatial patterns in caribou relative spatial density, and c) summarized vegetation change data associated with caribou relative spatial density classes.
DOI: 10.18739/a23x83n5m
title: Map of Permafrost Vulnerability in Central Alaska, 2025

description: To assess the vulnerability of permafrost to climate warming and disturbance, we differentiated permafrost responses in terms of rate of thaw, potential thaw settlement, and thermokarst development. Using a rule-based model that used geomorphic units for spatial extrapolation at the landscape scale, we mapped ten vulnerability classes across three areas in central Alaska ranging from high potential settlement-low thaw rate in extremely ice-rich loess to low potential settlement/high thaw rate in rocky hillslope colluvium. The files contain the ArcMap geospatial database, metadata, and a manuscript detailing methods and results.
DOI: 10.15468/dl.sfhw28
title: Occurrence Download

description: A dataset containing 704696 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "TaxonKey is Firmicutes"
 ]
}

 The dataset includes 704696 records from 720 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016815-250525065834625/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2445hf16
title: Observations in ice-rich permafrost systems, Prudhoe Bay Alaska, August 2020

description: The National Science Foundation (NSF) Navigating the New Arctic (NNA) project “Landscape evolution and adapting to change in Ice-Rich Permafrost Systems (NNA-IRPS)” investigates key questions relating to ice-rich permafrost systems (IRPS): How are climate change and infrastructure affecting IRPS? What roles do ecosystems play in the development and degradation of IRP? and How can people and their infrastructure adapt to changing IRP systems? This dataset summarizes the results of field work related to the "Landscape Evolution" portion of the project that is geographically focused in the Prudhoe Bay Oilfield (PBO), Alaska, and is focused on 1) how differences in vegetation, soils, water, and time influence the accumulation and degradation of ground ice in IRP landscapes; and 2) how the loss of ground ice can radically change these landscapes, their components, and the infrastructure built on them. This dataset covers a shortened 2020 field seasons due to the COVID pandemic. Field work was conducted from a field camp situated approximately 14 kilometers (km) south of Deadhorse. The primary goals were to (1) conduct a reconnaissance of a new Natural Ice-Rich Permafrost Observatory (NIRPO), (2) monitor late-season thaw depths, water-depths, ice-wedge polygon microrelief contrasts, and vegetation distribution along six previously established transects closer to industrial roads and infrastructure.in the PBO, and (3) provide training and field-site overview for a new graduate student and post doc. An "Adaptation to Change" component of the NNA-IRPS project is focused on housing foundations and landscape changes related to climate and infrastructure in the village of Point Lay. No field research was conducted in Point Lay in 2020 due to the pandemic.
DOI: 10.18739/a24746t31
title: Characterization of decade-time scale change in Retrogressive Thaw Slumps across Northern Alaska, 2021-2023

description: Delineations of Retrogressive Thaw Slump (RTS) expansion and light detection and ranging (LiDAR) datasets (LAS files) of RTS sites were used to model how rates of RTS change are influenced by topographic and climatic characteristics across northern Alaska. LiDAR data were collected at ten sites, where five were collected from an uncrewed aerial system (UAS) and five were collected from a terrestrial LiDAR systems (TLS). LiDAR datasets were used to bias correct the open-source ArcticDEM (2 meter-resolution) for calculating annual rates of RTS volumetric losses across all sites. RTS Delineations were used to calculate annual rates of RTS areal expansion and summarize topographic characteristics calculated from the corrected ArcticDEM. Two shapefiles were created from historic satellite and aerial imagery (1949-2021) to summarize RTS areal change across 44 slumps: AK_RTS_ExansionDelineations.shp summarizes the area of RTS expansion between two time periods and AK_RTS_Delineations.shp summarizes the total RTS outline in each year where RTS expansion occurs. LiDAR UAS and TLS data are provided as LAS files from 12 slumps (five sites) near Toolik Lake and 9 slumps (5 sites) within the Noatak National Preserve.
DOI: 10.18739/a24b2x68b
title: Near-surface permafrost studies near Bethel and remotely sensing ice wedge networks across the Yukon Kuskokwim Delta, Alaska 2025

description: This dataset documents the occurrence, distribution, and characteristics of cryptic ice wedge networks in the Yukon-Kuskokwim Delta (YKD), Alaska. The dataset is derived from remote sensing analyses, field-based permafrost coring, ground-penetrating radar (GPR) surveys, and stable water isotope analyses. High-resolution aerial orthoimagery from 2018 enabled the identification of ~50 linear kilometers (km) of ice wedge trough networks within a 60 square kilometers (km²) study area near Bethel, Alaska, revealing ice wedge networks previously undocumented in the region. Fieldwork in 2023 and 2024 confirmed the presence of ice wedges up to 1.5 meter (m) wide and 2.5 m tall, with wedge tops averaging 0.9 m below the surface. GPR transects identified additional ice wedges beyond those visible in imagery, suggesting that remote sensing analyses may underestimate their true abundance. Coring of polygon centers revealed a suite of late-Quaternary deposits, including early Holocene peat, ice-rich late-Pleistocene permafrost (reworked Yedoma), charcoal layers indicating past tundra fires, and the Aniakchak CFE II tephra (~3,600 calendar years before present [cal yrs BP]). Stable water isotope analyses of wedge ice (mean δ¹⁸O = -15.7 ‰, δ²H = -113.1 ‰) indicate relatively enriched values compared to other Holocene ice wedges in Alaska, reflecting the region's warm maritime climate influence. Expanding the mapping analysis across the YKD using very high-resolution satellite imagery, we found that 95 % of observed ice wedge networks occur at elevations between 4 and 80 meters above sea level (m asl), predominantly within tundra vegetation classes. These areas, covering ~32 % of the YKD tundra region, may contain additional ice wedges, peat deposits, and relict Yedoma. This dataset provides a new framework for understanding the spatial distribution and environmental controls on ice wedge development in warm permafrost regions, with implications for permafrost resilience, climate change vulnerability, and land use planning in the YKD.
DOI: 10.15468/dl.up4nsc
title: Occurrence Download

description: A dataset containing 9484 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "TaxonKey is Tremarctos ornatus (F.G.Cuvier, 1825)"
 ]
}

 The dataset includes 9484 records from 80 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016828-250525065834625/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a24f1mm0s
title: Canadian National Fire Database

description: The Canadian National Fire Database (CNFDB) is a collection of forest fire data from various sources; these data include fire locations (point data) and fire perimeters (polygon data) as provided by Canadian fire management agencies (provinces, territories, and Parks Canada). Fires of all sizes are included in the database, but only those greater than 200 hectares in final size are shown in the map above — these represent a small percentage of all fires but account for most of the area burned (usually more than 97%).
DOI: 10.18739/a24f1mm18
title: Ground Temperature Monitoring of a Cover Crop Variety Trial in Fairbanks, Alaska during 2024 Growing Season

description: The Permafrost Grown project (NSF RISE Award # 2126965) is co-producing knowledge with farmers in Alaska (Tanana Valley and Bethel) to investigate the interactions and feedbacks between permafrost and agriculture. Additional project objectives include understanding legacy effects over a 120-year cultivation history in the Tanana Valley, evaluating the socio-economic effects of permafrost-agriculture interactions and provide decision making tools for farmers and finally to utilize education and outreach activities to share knowledge with the farmers and the public. The project focuses on in-the-ground farming in a range of cultivation types including crops, peonies and livestock. The project is funded through NSF’s Navigating the New Arctic Initiative. 
 This work was carried out at the University of Alaska Fairbanks Experimental Farm. This work was done through the Permafrost Grown Project as part of an effort to determine the thermal impact of a variety of cover crops and evaluate their potential impact on permafrost.
 Temperature monitoring and data collection was done in collaboration with a cover crop variety trial based at the University of Alaska Fairbanks that is supported by a Cooperative Agreement with the US Department of Agriculture Agricultural Research Service (award #58-3064-1-001).