cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a26t0gw4p
title: Hydrologic data from a firn aquifer in Southeast Greenland, 2015-2016

description: The Greenland ice sheet is losing mass, which can contribute to sea level rise. Firn aquifers covering between 22,000 – 90,000 km2 have recently been discovered within the ice sheet. In summer, surface snowmelt infiltrates to depth, saturating pore space within the compacting firn. Recharge ceases when the surface temperatures cool below 0ºC in the fall. Instead of refreezing, the meltwater stays in liquid phase throughout the year because of the insulation produced by high snow accumulation rates. This liquid flows through the firn, and discharges from the aquifer, likely to crevasses at the edge of the ice sheet. Flow through the firn behaves according to Darcy’s law. Instead of permanently storing meltwater, either through refreezing or simple storage in pore space, firn aquifers allow large volumes of meltwater to discharge from the ice sheet. The fate of that meltwater and its pathways to the ocean remain unknown and require further work as some scenarios (e.g., hydrofracturing crevasses leading to basal lubrication) could play important roles in accelerating ice flow and discharge to the ocean. This dataset contains field data from a series of tests to characterize the hydraulic properties of a firn aquifer in Southeast Greenland. The aquifer and slug tests are meant for estimating the hydraulic conductivity of the firn aquifer. Aquifer tests were conducted by pumping water out of a borehole and measuring the water level change within the aquifer. Slug tests were conducted by lowering the water level in a sealed piezometer installed in the aquifer by pumping air into it and measuring the water level recovery upon venting the piezometer. The borehole dilution tests, which measured the decrease in specific conductance following injection of saltwater into a borehole over time as freshwater flows through the aquifer, are meant to measure the rate of liquid flowing through the firn aquifer.
DOI: 10.18739/a2bk16p8t
title: Carbon monoxide (CO) measurements in ice cores from Greenland Summit: investigation of in situ CO production, 2015-2019

description: This data set, when complete, will contain 1) continuous CO (carbon monoxide) measurements from two shallow ice cores near Greenland Summit, 2) results of tests investigating the hypothesis of rapid CO production from glacial ice during melting and 3) results of a small set of CO isotopic measurements from ice cores at Greenland Summit. The data set encompasses results of a study that is focused on investigating the causes of CO artifacts observed in Greenland ice cores.
DOI: 10.18739/a2gb1xh26
title: Riparian Shrub expansion: soil analysis data, microbial communities and microarray gene data from the North Slope of Alaska, 2016

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. The biogeophysical characteristics associated with tall shrub expansion near streams could potentially explain the documented increases in carbon and nutrient export from large Arctic rivers through the underlying processes of widespread permafrost degradation and increased subsurface flow. Additionally, occurrences of tall shrubs could be used as a readily measured proxy for subsurface properties both across space and time using remote sensing. If our observations hold true in other stream environments, the information has the potential to provide novel hydrological, permafrost, and biological process insights to complement the extensive literature on increasing Arctic shrub cover. Preliminary measurements of differential runoff in Arctic tundra link tall shrubs along riparian corridors to losing stream sections (streams with decreasing discharge downstream), whereas gaining or maintaining stream sections (increasing discharge downstream) lack tall shrubs. 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. Therefore, we measured two streams with differing gradients, bed morphologies, and substrates to test the statistical significance of our preliminary observation that tall shrubs indicate losing streams. Furthermore, we expanded our measurements to include shrub height, cover, biomass, Leaf Area Index (LAI), permafrost, soil properties and soil microbial communities. To describe the soil properties and the microbial communities, we sampled soils along two Creeks (Oksrukuyik and Aesthetic creek) on the North Slope of Alaska from 21st-27th August 2016. We sampled composite soils samples (2 creeks x 2 hydrologic regimes x 3 replications= 12 samples). Soils were sampled from the upper 10 cm of the soil profile. Soil nutrients, moisture and texture were analyzed and was DNA extracted. Bacteria (V4 region) and fungi (ITS2) were sequenced on a MiSeq. The presence and relative abundance of functional genes was determined with the GeoChip 5.0 functional gene microarray.
DOI: 10.5281/zenodo.3385287
title: Seismic anisotropy dataset from Illsley-Kemp et al., G3, 2019 (10.1029/2019GC008529)

description: The datasets provided here are the seismic anisotropy results for the four seperate regions of New Zealand, reported and discussed in Illsley-Kemp et al., <em>Geochemistry, Geophysics, Geosystems, </em>2019 (10.1029/2019GC008529). If you use this date, please cite the following paper: Illsley-Kemp, F., Savage, M. K., Wilson, C. J. N., & Bannister, S., 2019, 10.1029/2019GC008529. Mapping Stress and Structure from Subducting Slab to Magmatic Rift: Crustal Seismic Anisotropy of the North Island, New Zealand. <em>Geochemistry, Geophysics, Geosystems.</em> The data are csv files in the same format as MFAST output (http://mfast-package.geo.vuw.ac.nz), with each column corresponding to the following: 1: Result ID 2: Station code 3: Station latitude 4: Station longitude 5: Earthquake ID (after GeoNet) 6: Year 7: Julian day on which the event occurred, with decimal digits giving the fraction of the day 8: Earthquake latitude 9: Earthquake longitude 10: Earthquake-station distance (km) 11: Earthquake depth (km) 12: Earthquake magnitude 13: Back azimuthal angle 14: Initial polarisation of the shear wave in degrees 15: Error of Spol in degrees, one standard deviation 16: Start time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0 17: End time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0 18: Not used 19: Not used 20: Signal to noise ratio 21: Delay time (δt) between fast and slow shear wave in seconds 22: Error of δt in degrees, one standard deviation 23: Angle of the orientation of the fast shear wave (φ), in degrees from North 24: Error of φ in degrees, one standard deviation 25: Angle of incidence at the station, measured against a horizontal plane in degrees, where 0 means vertical incidence 26: Not used 27: Type of measurement. This field contains the measurement code that is used, the number of measurement window start times and the number of window end times 28: Not used 29: Not used 30: Nyquist frequency of the event in Hz 31: Evaluation of the measurement quality 32: Lower corner frequency of the bandpass filter in Hz 33: Higher corner frequency of the bandpass filter in Hz 34: Angle between the initial polarisation and the fast orientation in degrees 35: Not used 36: Not used 37: The maximum value of the eigenvalue of the corrected covariance matrix 38: The number of degrees of freedom in the measurement 39: The minimum value of the eigenvalue of the covariance matrix before it was scaled to have the 95% confidence level set to 1 40: The S-wave travel time between the earthquake and the station 41: The dominant frequency in the S wave, determined from the frequency at the maximum spectral amplitude
DOI: 10.5281/zenodo.3385288
title: Seismic anisotropy dataset from Illsley-Kemp et al., G3, 2019 (10.1029/2019GC008529)

description: The datasets provided here are the seismic anisotropy results for the four seperate regions of New Zealand, reported and discussed in Illsley-Kemp et al., <em>Geochemistry, Geophysics, Geosystems, </em>2019 (10.1029/2019GC008529). If you use this date, please cite the following paper: Illsley-Kemp, F., Savage, M. K., Wilson, C. J. N., & Bannister, S., 2019, 10.1029/2019GC008529. Mapping Stress and Structure from Subducting Slab to Magmatic Rift: Crustal Seismic Anisotropy of the North Island, New Zealand. <em>Geochemistry, Geophysics, Geosystems.</em> The data are csv files in the same format as MFAST output (http://mfast-package.geo.vuw.ac.nz), with each column corresponding to the following: 1: Result ID 2: Station code 3: Station latitude 4: Station longitude 5: Earthquake ID (after GeoNet) 6: Year 7: Julian day on which the event occurred, with decimal digits giving the fraction of the day 8: Earthquake latitude 9: Earthquake longitude 10: Earthquake-station distance (km) 11: Earthquake depth (km) 12: Earthquake magnitude 13: Back azimuthal angle 14: Initial polarisation of the shear wave in degrees 15: Error of Spol in degrees, one standard deviation 16: Start time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0 17: End time of the selected measurement window in seconds, relative to the start of the seismogram at t = 0 18: Not used 19: Not used 20: Signal to noise ratio 21: Delay time (δt) between fast and slow shear wave in seconds 22: Error of δt in degrees, one standard deviation 23: Angle of the orientation of the fast shear wave (φ), in degrees from North 24: Error of φ in degrees, one standard deviation 25: Angle of incidence at the station, measured against a horizontal plane in degrees, where 0 means vertical incidence 26: Not used 27: Type of measurement. This field contains the measurement code that is used, the number of measurement window start times and the number of window end times 28: Not used 29: Not used 30: Nyquist frequency of the event in Hz 31: Evaluation of the measurement quality 32: Lower corner frequency of the bandpass filter in Hz 33: Higher corner frequency of the bandpass filter in Hz 34: Angle between the initial polarisation and the fast orientation in degrees 35: Not used 36: Not used 37: The maximum value of the eigenvalue of the corrected covariance matrix 38: The number of degrees of freedom in the measurement 39: The minimum value of the eigenvalue of the covariance matrix before it was scaled to have the 95% confidence level set to 1 40: The S-wave travel time between the earthquake and the station 41: The dominant frequency in the S wave, determined from the frequency at the maximum spectral amplitude
DOI: 10.17632/r2vv8pfnwv.1
title: Data for: The Effectiveness of Patient Activation Intervention on Type 2 Diabetes Mellitus Glycemic Control and Self-Management Behaviors. Systematic Review of RCTs

description: Search Strategy
DOI: 10.17632/rcfjjxhk52.1
title: Data for: Geochemical characteristics of the Lower Silurian Longmaxi Formation on the Yangtze Platform, South China: Implications for depositional environment and accumulation of organic matters

description: The TOC and major and trace element concentrations of the Longmaxi Formation.
DOI: 10.18739/a2319s30q
title: Arctic Ecosystem Integrated Survey (EIS) conductivity, temperature, and depth (CTD) data, Northern Bering and Chukchi Seas, 2012-2013

description: Conductivity, temperature, and depth (CTD) profile data collected during a joint Arctic Ecosystem Integrated Survey (EIS) study between NOAA Alaska Fisheries Science Center and University of Alaska Fairbanks in the Northern Bering and Chukchi Seas during 2012 and 2013. Note: this data set runs August-Sept for 2012 and 2013, and is not continuous from 2012-2013.
DOI: 10.18739/a2fb4wm2z
title: Stable carbon and nitrogen isotopes in fertilized arctic soils 2015

description: The file contains carbon and nitrogen stable isotope values for active layer mineral and organic soils from the 2015 pluck (harvest) at Toolik Research Station, Alaska. Permafrost soils were continuously fertilized for three decades beginning in 1981. Fertilization consisted of once yearly addition of nitrogen (10 grams ammonium nitrate per square meter) and phosphorus (5 grams phosphorus pentoxide per square meter) at spring melt.
DOI: 10.18739/a2k35md63
title: Weather data during the 2016 melt season at Taku Glacier, Alaska.

description: Subglacial water discharge exerts an important control on the speed of glacier flow, among other important processes. The amount of subglacial water discharge and the structure of the subglacial drainage system through which is passes vary on hourly to seasonal timescales. However, understanding these important characteristics of subglacial water drainage is hindered by the inaccessibility of the glacier bed. In 2016, seismic and weather data were collected from around Taku Glacier, Alaska, to reveal the structure and evolution of the subglacial drainage system. This study is reported in: Vore, M. E., T. C. Bartholomaus, J. P. Winberry, J. I. Walter, and J. M. Amundson, (under review in November 2018, following minor revisions), Seismic tremor reveals spatial organization and temporal changes of subglacial water system, Journal of Geophysical Research – Earth Surface. This dataset consists of weather data collected during the 2016 melt season at Taku Glacier and used in the above referenced publication for the purpose of modeling meltwater inputs to Taku Glacier. The accompanying seismic data is archived with the IRIS DMC (http://ds.iris.edu/mda/ZQ?timewindow=2015-2016) Data reported here were collected by two Vaisala WXT520 and one Onset HOBO tipping bucket rain gauge deployed off ice, approximately 100 m from the margin of Taku Glacier at two locations, station ETIP (Eastern tip of Taku Glacier) and station TWLV (Adjacent to the location where the glacier is twelve-hundred meters thick). These weather instruments were co-located with seismometers. One WXT520 and the rain gauge at ETIP, at sea level at the glacier terminus, and the second WXT520 at TWLV, at 600 m and approximately 13 km upglacier of the terminus.
DOI: 10.18739/a2pv6b70j
title: Radon-222/Radium-226 profiles Beaurfort Sea

description: We present 34 profiles of radon-deficit from the ice-ocean boundary layer of the Beaufort Sea. Including these 34, there are presently 58 published radon-deficit estimates of k, the air-sea gas transfer velocity in the Arctic Ocean; 52 of these estimates were derived from water covered by 10% sea ice or more. The average value of K collected since 2011 is 4.0 +- 1.2 m d-1 This exceeds the quadratic wind speed prediction of weighted kws = 2.85 m d-1 with mean weighted wind speed of 6.4 m s-1. We show how ice cover changes the mixed-layer radon budget, and yields an “effective gas transfer velocity”. We use these 58 estimates to statistically evaluate the suitability of a wind speed parameterization for k, when the ocean surface is ice covered. Whereas the six profiles taken from the open ocean indicate a statistically good fit to wind speed parameterizations, the same parameterizations could not reproduce k from the sea ice zone. We conclude that techniques for estimating k in the open ocean cannot be similarly applied to determine k in the presence of sea ice. The magnitude of k through gaps in the ice may reach high values as ice cover increases, possibly as a result of focused turbulence dissipation at openings in the free surface. These 58 profiles are presently the most complete set of estimates of k across seasons and variable ice cover; as dissolved tracer budgets, they reflect air-sea gas exchange with no impact from air-ice gas exchange.
DOI: 10.18739/a2tm72155
title: Beryllium-7 concentrations in seawater and aerosols from the Polarstern Cruise ARK-XXVI/3, Arctic Ocean 2011

description: The atmospheric input of numerous chemical species into the global ocean has been shown to equal or exceed that from river sources. In the Arctic, several contaminant elements in particular are dominated by atmospheric sources, with implications for the Arctic ecosystem and human health. In this project the naturally occurring isotope beryllium-7, which is produced in the atmosphere by cosmic rays and has a 53.3-day half-life, was used as a tracer for estimating the atmospheric fluxes of a variety of trace elements to the surface of the Arctic Ocean. Samples of snow, sea ice, surface waters (up to 40m deep), and atmospheric aerosols were collected from on board R/V Polarstern and ice stations during August and September 2011.
DOI: 10.17632/3cjvh3jtbg.1
title: Data for: Complex response of vegetation to grazing suggests need for coordinated, landscape-level approaches to grazing management.

description: Point-intercept data recorded as both the number of points when a species was observed, as well as simple presence / absence data for 10 sub-samples within 3 replicate plots for 3 grazing treatments over a 20-year period. Major plant functional groups and taxonomic families included.
DOI: 10.17632/p3g9cph27s.1
title: Data for: Long-term outcomes of therapeutic ERCP in pediatric patients with pancreas divisum presenting with acute recurrent or chronic pancreatitis

description: The processed data include the detailed information of patients, endoscopic procedures and follow-up results.
DOI: 10.17632/zp7zbdy8jg.1
title: Data for: The N$_2$ Second Positive ($C^{3}\Pi_{u} \rightarrow B^{3}\Pi_{g}$) system reviewed: improved data and analysis
DOI: 10.18739/a2251fk3b
title: Lake dynamics in the tundra of Western Greenland from 1969-2017

description: We analyzed changes in small lake count (&lt;10,000 m2), large lake count (&gt;10,000 m2), and lake surface area across the periglacial tundra of western Greenland, using historical satellite and aerial imagery and weather data from the late 1960s- present. Overall, we found a decrease in lake count (21%) and surface area (2%) across our study region. Specifically, smaller ponds were particularly prone to change, with decreases of 28% in count and 15% in surface area. Shrinking lakes often became revegetated by both emergent aquatic and terrestrial vegetation, which captures potential successional trajectories following Arctic lake drying. Additionally, while annual precipitation may be increasing, it occurred primarily during the winter months in the form of snow which may or may not contribute to the overall growing season water budget. Conversely, the peak growing season months of June, July, and August all have experienced significant increases in potential evaporation rates, thus likely creating a water deficit for a bulk of the growing season.
DOI: 10.18739/a25t3g04v
title: AmeriFlux CA-Man Manitoba - Northern Old Black Spruce (former BOREAS Northern Study Area). 1994-2008

description: Measurements taken at: Manitoba - Northern Old Black Spruce (former BOREAS Northern Study Area)
DOI: 10.5519/qd.ptsqglli
title: Query on the Natural History Museum Data Portal (data.nhm.ac.uk) (131 records)
DOI: 10.17632/644shddfc5.1
title: Data for: Bioaccumulation and biomagniﬁcation of hexabromocyclododecane (HBCD) in insect-dominated food webs from a former e-waste recycling site in South China

description: raw HBCD concentration
DOI: 10.18739/a2db7vq2q
title: Alaska Lake Ice and Snow Observatory Network (ALISON) Project Data, Alaska, 1999-2011

description: This project, Alaska Lake Ice and Snow Observatory Network (ALISON, OPP-0326631), is a science education and scientific research partnership between the University of Alaska Fairbanks and K-12 education community in Alaska. The dataset presented here is a summary of winter field data collected by project investigators and teachers and classrooms in many lakes throughout Alaska from 1999 to 2011. Data has been organized and made available as part of a new project, NNA (Navigating New Arctic): Fresh Eyes on Ice: Connecting Arctic Communities through a Revitalized and Modernized Freshwater Ice Observation Network (OPP-1836523).
DOI: 10.18739/a2nv99b09
title: Marine Mammal sighting data from cruises in the Pacific Arctic, 2018, from Distributed Biological Observatory (DBO) regions

description: The Pacific Arctic region (PAR) extends from the northern Bering Sea to the Arctic Ocean Basin, and it is experiencing major reductions in seasonal sea ice and increases in sea surface temperatures. Within the PAR, the northern Bering and Chukchi Seas are among the most productive marine ecosystems in the Arctic and are important carbon sinks and seasonal sources of organic materials. These recent shifts in seasonal sea ice cover are having profound consequences for seasonal phytoplankton production as well as to intimately linked higher trophic levels, including food harvested locally for subsistence. Key uncertainties remain as to 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. Productivity may change as sea ice declines and penetration of sunlight into open water increases, but the trajectory of changes to food web structure are unclear. Many organisms, from plankton to top predators are changing their distribution, migration and foraging patterns. A number of marine sites in the Pacific Arctic have high biomass, both in the water column and on the seafloor and are focused foraging points for apex predators. Several of these sites have been identified and re-occupied seasonally and interannually during multiple international cruises as part of the Distributed Biological Observatory (DBO) network. The DBO observational data documenting the importance of these ecosystem “hotspots” provide a growing marine time-series from the northern Bering Sea to Barrow Canyon at the boundary of the Chukchi and Beaufort seas, and across the Beaufort Sea to Amundsen Gulf. In US waters, these sites are DBO1 (south of St. Lawrence Island, DBO2 (Chirikov Basin north of SLI), DBO3 (southern Chukchi Sea), DBO4 (central Chukchi Sea), DBO5 (upper Barrow Canyon) , DBO6 (Beaufort Sea shelf break at ~152 West). As part of DBO efforts, marine mammal visual detections have been obtained from any research voyage with an on-board observer and sightings within DBO regions 1-6 have been highlighted. This dataset contains observations from the vessels: Healy, Sir Wilfrid Laurier (SWL), and Sikuliaq.
DOI: 10.18739/a2sn01440
title: Sonar Depth Measurements at Lakes on the Inner Arctic Coastal Plain of Alaska, July 2017

description: This dataset provides discrete depth point measurements, each collected as part of a transect at 19 lakes on Alaska's Inner Arctic Coastal Plain. Lakes at which measurements were collected had to be large enough for a floatplane to land on (i.e. &gt; ~1 km2 lake surface area), as data were collected by attaching a HumminBird 798ci HD SI Combo automatic sonar unit to the back of a float and either taxiing slowly or drifting across lakes. Depth points were measured by the sonar recorder every second and are vertically accurate to 0.03 m. Erroneous points have been manually removed. All data were collected between July 22, 2017 and July 27, 2017. This depth data was collected for use in lake depth modeling. That is, these depth points were collected to serve as training and validation data for satellite imagery hue-based depth models. The purpose of such models is to reconstruct full bathymetry maps for lakes at which data were collected and ultimately, to derive regional bathymetry and volume estimates for the thousands of lakes across northern Alaska.