cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a2xd0qx8b
title: Surface sediment samples collected from the Canadian Coast Guard Ship (CCGS) Sir Wilfrid Laurier, Northern Bering Sea to Chukchi Sea, 2016

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. This dataset contains summary measurements of surface sediment collected at each station for the identified cruise, including: sediment grain size (≤0 phi, 1 phi, 2 phi, 3 phi, 4 phi, &gt;=5 phi, 1-4 phi, and modal phi size), total organic carbon (TOC), total organic nitrogen (TON), C/N and surface sediment chlorophyll (chl a). Surface sediment chlorophyll (chl a) content is scaled up to mg Chl a/m2.
DOI: 10.6084/m9.figshare.9884195.v1
title: A novel multi-stage ensemble model with fuzzy-clustering and optimized classifier composition for corporate bankruptcy prediction

description: The datasets contain the financial indicators of Polish manufacturing corporates from 2007 to 2011 were separated into five parts (each part represents each fiscal year). The raw data were obtained from the UCI machine learning library.
DOI: 10.18739/a2154dp4k
title: Yukon-Kuskokwim Delta fire: soil and permafrost carbon, nitrogen, horizons, and ice structure, Alaska, 2016

description: The summer of 2015 was an extraordinary year for fire in the Arctic, including in the Yukon-Kuskokwim Delta, presaging a future where tundra and boreal fire is far more common. Remarkably, the area burned in the YK Delta in 2015 exceeds the total area burned from 1940-2014 combined. The response of the YK Delta in the first year post-fire will set the stage for longer-term changes in delta carbon storage and transport among tundra, aquatic and marine systems, and to the atmosphere. Quantifying carbon export and understanding the immediate ecosystem response to fire is critical because long-term recovery is, to a considerable degree, dependent on short-term responses. A major question that this research will address is how fire influences the amount and form of carbon transported from delta ecosystems seasonally and in the first year following fire. Ultimately, these results will inform long-term trajectories of the vulnerability and fate of delta carbon pools. This research will significantly improve our understanding of the role of fire in the loss of both modern and ancient carbon from arctic river deltas, which contain &gt;10% of the Arctic's massive permafrost carbon store. Arctic river deltas are hotspots for carbon storage, occupying &lt;1% of the pan-Arctic watershed but containing &gt;10% of carbon stored in arctic permafrost. They are also heterogeneous mosaics of linked terrestrial and aquatic ecosystems, and are susceptible to changes in land, river, and marine systems. The vulnerability of carbon stored in arctic river deltas is a major unknown and is critically important as climate warming and increasing fire frequency may make this carbon vulnerable to transport to aquatic and marine systems and to the atmosphere. The goal of this proposal is to examine the immediate effects of fire on carbon storage in the Yukon-Kuskokwim Delta and exchange between terrestrial and aquatic components of the Delta. By extension this work will yield critical insights into how the carbon balance of deltas in the arctic system will change over the coming decades as warming continues and fire frequency increases. This dataset includes soils and permafrost collected during the summer 1 year after the fires. Soil and permafrost horizons are described, and measured for bulk density, soil moisture, volumetric ice content, pH, soil organic matter content, extractable nitrogen and carbon content, and cryo-structures are described,
DOI: 10.18739/a24x54g8d
title: A synthesis dataset of near-surface permafrost conditions for Alaska, 1997-2016

description: We compiled a near-surface permafrost temperature dataset from 72 monitoring stations in Alaska using data collected by the U. S. Geological Survey, the National Park Service, and the University of Alaska-Fairbanks permafrost monitoring networks. The array of monitoring stations spans a large range of latitudes from 60.9°N to 71.3°N and elevations from near sea level to 1327 m. The major vegetation types are tundra and boreal forest. The resulting dataset consists of monthly air and ground temperatures, volumetric water content, and snow depth during 1997 - 2016. Due to the remoteness and harsh conditions, many stations have missing data. Overall, this dataset consists of 41,667 monthly values.
DOI: 10.18739/a2h41jm7n
title: Biogeochemical lake samples for the Circumarctic Lakes Observation Network (CALON), North Slope, Alaska, 2012-2015

description: Our team completed fieldwork in both April and August of 2012, 2013, 2014, and 2015 to collect various measurements and samples along two transects of lakes across Alaskan North Slope. To date, we have analyzed over 300 samples for chromophoric dissolved organic matter (CDOM), chlorophyll-a (and phaeophytin), as well as a suite of cations and anions: Iron, chlorine, sulfate, nitrate, phosphate, sodium, ammonium, potassium, magnesium, and calcium (F, Cl, SO4, NO3, PO4, Na, NH4, K, Mg, and Ca). Biogeochemical data reveal distinct spatial and seasonal variability in chlorophyll biomass, CDOM, and major cations/anions. In general, waters sampled in April had consistently distinctly higher concentrations of inorganic solutes. Lake waters with the highest total dissolved solid concentrations (~3000 mg/L) were dominated by Na and Cl, indicating a potential seawater influence. The remaining samples grade towards Ca-Mg-HCO3-type waters, reflecting dissolution of carbonate minerals found in underlying rocks and sandstone cements. We also found that chlorophyll concentrations and CDOM absorption were both generally higher during April (compared with August), suggesting significant biological/biogeochemical activity even under lake ice during this early part of the year. By August, primary production may have been limited by the presence of sufficient nutrients and CDOM concentrations may have therefore declined owing to photodegradation processes or bacterial decomposition. One additional striking observation is the latitudinal trend in some biogeochemical constituents, generally increasing from south to north.
DOI: 10.18739/a2j960930
title: Detecting the Signature of Permafrost Thaw in Arctic Rivers, Siberia, Russia 2012 - 2014

description: Permafrost soils in the Arctic contain vast quantities of ancient organic matter. If thawed, the decomposition of this aged organic carbon will release the greenhouse gases CO2 and CH4 to the atmosphere, fueling a positive feedback between permafrost thaw and global warming. The term “carbon bomb” has been used to describe this process, primarily in the popular press but also within journals such as Nature and Science. Numerous studies have shown extensive permafrost thaw and degradation in the Arctic, but dissolved organic carbon (DOC) exported from the mouths of large Arctic rivers – which are expected to integrate processes and changes occurring through their watersheds – has been shown to be predominantly modern. This raises the question, where is the ancient organic carbon that is mobilized from permafrost degradation and the deepening of the active layer? Research supported by this grant highlighted fundamental new insights into the fate of permafrost thaw derived DOC in Arctic inland waters. A major focus was placed on the period of maximum permafrost thaw in the fall at the time of deepest active layer depth. Four full field campaigns were undertaken examining the field sites in the Kolyma watershed (Siberia). Our results highlighted mobilization of ancient (&gt;20,000 ybp) DOC in streams draining from permafrost landscapes. We showed for the first time direct utilization of ancient (&gt;20,000 ybp) permafrost thaw DOC in stream networks along with concurrent shifts in the molecular structure of the dissolved organic matter (DOM) resulting in the remaining DOM looking similar to modern sources of DOM from terrestrial inputs in the Kolyma Basin. Additionally, microbial demand was supported by progressively younger carbon downstream through the Kolyma fluvial network, with predominantly modern carbon pools subsidizing microorganisms in large rivers and main-stem waters. Our results add significant weight to the argument that any permafrost inputs will be rapidly degraded in small thaw streams and the loss of molecular signature along with high biolability of permafrost derived DOC makes the permafrost inputs difficult to study using samples from major rivers. Permafrost was shown to act as a significant and preferentially degradable source of bioavailable carbon in Arctic freshwaters, which is likely to increase as permafrost thaw intensifies causing positive climate feedbacks in response to on-going climate change.
DOI: 10.18739/a2rn30757
title: Petermann Expedition, Oden July 2015, marine core data for mineralogy, foraminifera and particle size, Greenland, 2019

description: The overarching goal of this project was to study the Petermann Glacier/ice tongue system and its response to past climate changes, especially during the Holocene. This is a major outlet of the Greenland Ice Sheet and one of only a couple that terminates in a buttressing ice tongue. Its past sensitivity to changes in ocean and atmosphere temperature and sea level are important for predicting its response to modern and future warming. Our research focuses on reconstructing the extent of the Petermann Glacier during the LGM (Last Glacial Maximum), the timing, rate and style of ice retreat, and the role of ocean forcing, sea level variation and fjord morphology and interaction with other ice sheets and outlets in its past behavior. As a collaborative group, we use the geological and geophysical data collected during the July to Sept. 2015 cruise of icebreaker Oden (OD1507) to the Petermann Fjord and Hall Basin to accomplish our goals. The University of Colorado was responsible for developing certain basic aspects of stratigraphy and paleoceanography through the analyses of mineralogy, grain size and foraminiferal assemblages in sediment cores collected during OD1507 augmented by analysis existing sediment cores collected in 2001 on Canadian cruise 2001LSSL (Louis Saint Laurent). Three types of data are provided. 1. Quantitative X-ray mineralogy (qXRD) data in percentage form; 2. Particle size data processed for grain size parameters using Gradistat program; 3. Foraminiferal percentage and abundance data.
DOI: 10.18739/a2wd3q190
title: Synoptic stream discharge August 2016, Dalton Highway, Alaska

description: The climatic drivers and landscape-scale patterns of recent Arctic shrub expansion are well understood, while the biogeochemical and physical mechanisms controlling shrub recruitment and growth remain unclear. We tested whether the formation of a talik (permafrost-free ground) and a downward hydrologic gradient creates a biogeochemical subsurface environment that favors shrub recruitment and growth, which, in turn, results in patterns of tall shrub distribution coinciding along losing stream reaches. We analyzed streams and stream corridors with differing gradients, bed morphologies, and substrates to test the statistical significance of tall shrubs as indicators of losing streams (streams with decreasing discharge downstream). Furthermore, we expanded our measurements to include shrub height, cover, biomass, Leaf Area Index (LAI), permafrost, soil properties and soil microbial communities. Our measurements of differential runoff in Arctic tundra link tall shrubs along riparian corridors to losing stream sections, whereas gaining stream sections (increasing discharge downstream) lack tall shrubs. The purpose of this dataset was to assess stream sections as losing (discharge decreases downstream) or gaining (discharge increase downstream) by performing synoptic discharge measurements. Measurements were done along the Dalton Highway corridor, north of Toolik, North Slope of Alaska in August 2016. The study was part of a multi-disciplinary study of ecohydrological relationships between shrubs and stream discharge in continuous permafrost environments.
DOI: 10.25919/5d845a861739c
title: Standing dead tree and down woody debris attributes from the Eucalyptus salubris chronosequence

description: Datasets of standing dead tree and down woody debris attributes from the multi-century Eucalyptus salubris (gimlet) time since fire chronosequence in the Great Western Woodlands, south-western Australia. These data include measures of piece sizes, densities, volumes and biomass, and have been used in the publication: Gosper, C.R., Yates C.J., Fox, E. and Prober, S.M. (in press) Time since fire and prior fire interval shape coarse woody debris dynamics in obligate-seeder woodlands. Ecosphere
DOI: 10.6073/pasta/03184e754631436a0bf91c88300566e0
title: CGR01 Sweep Sampling of Grasshoppers on Konza Prairie LTER Watersheds in 1981 Only

description: Sweep samples for estimating grasshopper (Acrididae) composition and relative abundance at one site for each of 12 Konza Prairie LTER fire/grazing/soil treatment combinations (3 fire treatments x 2 soils x 2 grazing treatments). Samples were collected in June, August, and September. At each site on each occasion, 18 sets of 10 sweeps each (180 sweeps total) were taken. Stored data include for each site on each occasion: total number of each species (all instars combined) collected and total number for each instar for each species (180 sweeps combined).
DOI: 10.18739/a23x83k85
title: Pacific Marine Arctic Regional Synthesis (PacMARS) benthic infauna, from Saint Lawrence Island, Alaska to the the East Siberian, Chukchi, and Beaufort Seas, Arctic Ocean, 1970-2012

description: As seasonal sea ice declines in much of the Arctic and reached record minima in 2012, oil and gas exploration are increasing, and additional ship traffic is also using Bering Strait, perhaps a portend of changes to come if the Northern Sea Route along the north coast of Russia becomes a practical ice-free route between Asia and Europe, reducing shipping costs significantly. The Northwest Passage through the Canadian Arctic has also become ice-free several times in recent summers, a significant change. All of the Arctic countries, including Russia, the United States, Canada, and Denmark (Greenland) are exploring the limits of their arctic continental shelves in order to advance claims under the Law of the Sea Treaty. Within this context of environmental and likely socio-economic changes, wildlife populations and human communities are adjusting to these shifts in seasonal sea ice coverage and climatic warming that has been much more obvious than at lower latitudes. Subsistence hunting patterns in the Arctic are changing, and it is also clear that many organisms, from plankton to top predators may be changing their migration and foraging patterns. Productivity is also forecast to change as sea ice declines and penetration of sunlight into open water increases. The Pacific Marine Arctic Regional Synthesis (*PacMARS*) is a research synthesis effort underwritten by the North Pacific Marine Research Institute to assemble by mid-year 2013 up-to-date written documentation that contributes to understanding the Pacific-influenced coastal shelf ecosystem of the Arctic Ocean. Our study area extends from Saint Lawrence Island in the Bering Sea through Bering Strait into the Chukchi and Beaufort Seas and our objective is to compile the best available knowledge from local communities, peer-reviewed social and natural sciences, as well as less readily available knowledge sources. The overall goal is to provide guidance for scientific research needs in the region, as well as to serve stakeholder needs for understanding this important ecosystem and its vulnerabilities. This dataset contains summary measurements of average benthic macroinfaunal taxa to the family level collected at each station for the identified cruise, with parameters of station, abundance, wet weight biomass (gww/m2), carbon dry weight biomass (gC/m2), number of taxa, Shannon-Wiener diversity and evenness indices, and number of grabs collected/station. For more information, see: https://pacmars.cbl.umces.edu/
DOI: 10.18739/a2513tw18
title: Greenland surface mass balance derived from climate reanalysis models, 1979-2017

description: This archive contains monthly gridded files (1979-2012) for an ensemble mean of the third-generation climate models NCEP Climate Forecast System Reanalysis (CFSR), ECMWF European Reanalysis Interim (ERAI), JMA Japanese 55-year Reanalysis (JRA55), and NASA Modern-Era Retrospective analysis for Research and Applications (MERRA) for 2-meter air temperature (t2), precipitation (prcp), mean sea level pressure (mslp), 10-meter wind speed (ws10), and derived net annual surface mass balance (mb). The ensemble mean provides a baseline comparison for how leading reanalysis models reproduce surface mass balance across the Greenland Ice Sheet, as derived from 2-meter temperature and precipitation fields. The archive also includes t2, prcp, and mb from the next generation reanalysis models ECMWF European Reanalysis version 5 (ERA5) (2010-2017) and the OSU Arctic System Reanalysis version 2 (ASR2) (2000-2012). Although the funded project targets the Greenland Ice Sheet, the processed reanalysis meteorological fields are available on the global domain (except for ASR2), and thus may have broader application to climate community researchers. This work was completed at the University of Maine and supported through the NSF collaborative project GreenTrACS (Greenland Traverse for Accumulation and Climate Studies) (Award #1417640). GreenTrACS, which includes field collaborators from Dartmouth College and Boise State University, seeks to better understand the accumulation and climate history of West Greenland.
DOI: 10.18739/a2cc0tt3h
title: Long-term functional impact of Herbivore Exclusion

description: This dataset represents differences in long-term (50+ years) ecosystem functional attributes (i.e. thaw depth, water table, NDVI, albedo, and land-atmosphere CO2 and CH4 exchange) in response to herbivore exclusion at peak growing season, in wet, moist, and dry land cover types. This dataset was collected during the summer of 2010, where ecosystem functional measurements were collected on both exclusion and control plots within gated herbivore exclusion plots that remained erect over 50+ years.
DOI: 10.18739/a2dj58g97
title: Ivotuk Flux Data - Shrub Site (Excel) [Beringer, J.]

description: This dataset includes flux data from the Shrub site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was operated continuously over the growing season whilst the remaining sites were characterized by a single tower that was moved from site to site. The MAT site is therefore used as a reference. This dataset is available in both ASCII and EXCEL formats - For data browsing, we suggest ordering the EXCEL version and using EXCEL to plot the data. NOTE: This dataset contains the data in EXCEL format.
DOI: 10.18739/a2kw57j2b
title: Photogrammetric scans of aerial photographs of North American glaciers, 1990. Roll 3 jpegs

description: Introduction: Between 1958 and 1999, Austin Post led the USGS collection of aerial imagery of North American glaciers. These images are primarily vertical stereo black and white images, although single oblique images, as well as color images have been collected. The glaciers of North America were the subjects, and the digital products made available here serve to document the changes that have occurred to the glaciers over the past 5 decades. The purpose of this project is to preserve the data contained within these film images in a digital format for future analysis of North American glacier change. Package Layout: 1. The first level contains an overall data set of image metadata from 1964 - 1997 (nagapData.csv) and an R script (searchData.R) with instructions on how to search and subset the data. fileLayout.pdf shows the file structure and folder contents visually. There are also three kml files with flight path information by decade. 2. The second level is the year in which the pictures were taken. There are 32 years with images from 1964 – 1997. The majority of these folders are jpegs with notes provided by Austin Post. They also contain a year-specific csv (YYYY.csv) that contains image metadata for the entire year (date, roll numbers, location name, longitude, latitude, altitude, media, and comments). The overall data set (nagapData.csv) is the aggregate of each individual “YYYY.csv” file. 3. The glacier photos are located at the third level (this level). The folders at this level are distinguished by camera roll number (1, 2, etc.), and image type (thumbnail, jpeg, or tif); some also contain fiducial and oblique image folders. This level primarily contains image files of aerial photos as either thumbnails, jpegs, or tifs. It also includes a csv with image metadata specific to each roll (date, roll numbers, location name, longitude, latitude, altitude, media, and comments), a text file (info.txt) with camera specifications unique to each image, and a text file (histo.txt or matchReport.txt) with color information and scanner specifications unique to each image.
DOI: 10.18739/a2qn5zb5m
title: Lavrentiya Eddy Covariance Data [Zalmolodchikov, D.]

description: This dataset contains data from the Lavrentiya field site, Chukotskiy peninsula, Russia. This is preliminary data taken using an eddy correlation tower. Two different file types are included in this dataset, one is a flux data which includes CO2 and H20 flux data, the other is footprint data which includes soil moisture data. See the readme for further details of measurements taken.