cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a2j09w48z
title: Microbial and chemical data on sea-ice brines

description: Sea-ice brines were collected from sackholes drilled into the ice cover of Kanajorsuit Bay in 2013 and Kobbefjord in 2014 near Nuuk, Greenland, along with sea-ice cores and under-ice seawater samples. Data obtained include concentrations of bacteria, viruses, particulate organic carbon and nitrogen, extracellular polysaccharides, chlorophyll a and phaeophytin pigments, and total suspended particulate matter, along with temperature, salinity, snow thickness, ice thickness and sackhole depth. Experimental work conducted on the samples, with additional details on sample characteristics, are published in Firth et al. (2016) [DOI 10.12952/journal.elementa.000120]. The purpose of the experiments was to assess the use of compatible solutes as a microbial strategy for surviving the fluctuations in salinity that occur seasonally in sea-ice brines and search for links to primary production. We found that compatible solutes are taken up and stored as brine salinity increases, and released and respired as salinity freshens. We found novel links to primary production mediated by bacterial nitrification but not by algal photosynthesis, as chlorophyll levels were negligible in the brines sampled.
DOI: 10.18739/a2d795b3q
title: 10Be and 26Al isotopic data in ODP marine sediment cores near eastern Greenland

description: The million-year behavior of ice sheets is poorly understood because younger glaciations remove the terrestrial record of older advances. However, material shed from continents is preserved as marine sediment that can be analyzed to infer glacial process and history. Here, we use measurements of in situ produced cosmogenic 10Be and 26Al in marine sediment cores to understand the long-term behavior of the eastern Greenland Ice Sheet. We find a progressive, order-of-magnitude decline in 10Be over the past 7.5 Myr, consistent with deep, ongoing erosion by ice of the pre-icehouse Greenlandic landscape. 26Al/10Be indicates that much of East Greenland was covered by ice for most of the Pleistocene. At major climate transitions, isotope concentrations and 26Al/10Be change, consistent with ice sheet expansion into previously ice-free terrain. The detrital cosmogenic history reflects major events recorded in the marine benthic δ18O record, confirming that the Greenland Ice Sheet consistently responded to global climate forcing.
DOI: 10.18739/a28g8fh9z
title: Greenland 10Be cosmogenic date in marginal sediment

description: We measured the concentration of in situ 10Be in quartz isolated from fluvial and morainal sand to trace sediment sources
and to determine the relative contribution of glacerized and deglaciated terrain to Greenland's sediment budget. We sampled along
the western, eastern, and southern margins of the Greenland Ice Sheet, and collected sediment sourced from glacerized (n = 19) and
non-glacerized terrain (n = 10), from channels where sediment from glacerized and non-glacerized terrain is mixed (n = 28), from
Holocene glacial-fluvial terraces (n = 4), and from one sand dune. In situ 10Be concentrations in sediment range from 1600 to
34 000 atoms/g. The concentration of in situ 10Be in sediment sourced from non-glacerized terrain is significantly higher than
in sediment sourced from glacerized areas, in mixed channel sediment, and in terrace sediment that was deposited during the
Holocene. 
 The entire data set along with maps and interpretation is available in
 Nelson, A. H., Bierman, P. R., *Shakun, J. D., Rood, D. H. (2014), Using in situ cosmogenic 10Be to identify the source of sediment leaving Greenland. Earth Surface Processes and Landforms. DOI: 10.1002/esp.3565
DOI: 10.18739/a24q7qq69
title: Greenland Ice Sheet Project 2 sulfate and nitrate isotopes

description: We measured sulfate oxygen and nitrate oxygen and nitrogen isotopes from the Greenland Ice Sheet Project 2 ice core from Greenland in 15 discrete samples (~ 2 kg of ice each) over the last glacial-interglacial cycle (from 976 - 97,681 years before present, between 264 - 2735 meters depth). Each sample spans ~50 cm depth, representing 2-200 years of snow accumulation. We also performed continuous measurements of nitrate nitrogen and oxygen isotopes on 112 samples over two Dansgaard-Oeschger (D O) events (DO-12 and -13 from 42,967 - 49,002 years before present). The length of each sample is 0.5-1.0 meter, representing ~50 years of snow accumulation.
DOI: 10.18739/a2125q937
title: Vertical PFAS profiles in the central Arctic Ocean

description: This data set reports concentrations of 
several poly- and perfluorinated alkyl substances (PFASs) 
in vertical water column profiles from the central Arctic Ocean.
Samples were collected in late 2012 on cruise ARK-XXII/3 on the RV Polarstern. 
The relative importance of atmospheric transport versus ocean currents for 
distributing poly- and perfluorinated alkyl substances (PFASs) to the
Arctic Ocean is not well understood. Samples representing vertical water 
column profiles from the Central Arctic Ocean and shelf, plus snow and meltwater 
samples, were collected in 2012 and analyzed for various PFASs. Surface water
concentrations of total PFASs in the Central Arctic Ocean ranged from 11-174 pg/L. In general, detection of PFASs was limited to 150m below surface, representing the polar mixed layer and halocline. More PFASs and at greater concentration were detected in melt pond water and snow samples when compared to those of water samples collected from the Arctic shelf and Ocean.
DOI: 10.18739/a2w950n93
title: Observed plant species emergence dates 2002 through 2013

description: This data set consists of annual observed first dates of emergence and leaf opening by plant species occurring at a study site near Kangerlussauq, Greenland. This is part of an ongoing effort to monitor the timing of plant emergence and species-level variation in emergence timing in relation to observed variation in climate and weather. Observations were recorded on a daily or near-daily basis on multiple, randomly distributed, permanently marked plots. The first date of emergence or leaf opening for each species observed on each plot was recorded as the day of year.
DOI: 10.18739/a2ms3k22q
title: Vertical profiles of dissolved PFASs in Arctic shelf waters

description: This data set reports dissolved concentrations of several poly- and perfluorinated alkyl substances (PFASs) in vertical water column profiles from the Arctic shelf. Samples were collected from seven locations on the Beaufort Chukchi Shelf from surface to bottom (up to 385 m) by the United States Coast Guard icebreaker in October 2012. Concentrations of PFASs in water samples collected along the Arctic shelf at different depths from nearshore to offshore were always dominated by PFOA, followed by PFOS and PFNA. Other PFASs were not routinely detected. Different PFAS composition profiles were observed between the samples collected along the Arctic shelf and the Arctic Ocean.
DOI: 10.18739/a2rj48v6f
title: PFAS concentrations in snow/meltwater from Central Arctic

description: This data set reports concentrations of several poly- and perfluorinated alkyl substances (PFASs) in 5 snow and meltwater samples from four locations in the Central Arctic. Samples were collected in late 2012 on cruise ARK-XXII/3 on the RV Polarstern. Snow has been suggested to be an effective scavenger of PFAS in the atmosphere 41 and an evidence for a primary source of PFAA to the Arctic via atmospheric oxidation of volatile precursors. More PFASs (C11 PFCA, FOSA, and EtFOSAA) were detected in melt pond water and snow samples when compared to those of water samples collected from the Arctic shelf and Ocean. Samples were collected from mostly first year ice, integrating PFAS deposition from up to one year. In the present investigation, the snow samples showed detectable concentrations of PFCAs (C6-C12), PFSAs (C8 and C10), MeFOSAA, EtFOSAA and FOSA (Figure 3). Concentrations were similar or greater to previously reported for the Devon ice cap (Young et al., 2007). Relatively high total PFAS concentration was observed in Station 5 - PS80/323 (1.60 ng/L; Station 1: 0.298 ng/L and Station 8: 0.368 ng/L). For all PFASs, there were stronger correlations between concentration and degree longitude, rather than degree latitude. Regressions versus longitude were significant (p&lt;0.10) for PFHxA and PFNA, and at p&lt; 0.20 for PFOA and PFOS. PFAS concentrations increased as samples were taken further east. This suggests that proximity to Eurasian continental emissions were more important than latitudinal fractionation.
DOI: 10.18739/a2h12v77s
title: Fertilization Branch Extension

description: Retrospective measurements of white spruce branch extension growth at four sites in each of three watersheds in the Brooks Range, before and after experimental fertilization with nitrogen (N), phosphorus (P) and potassium (K).
DOI: 10.18739/a2c824f31
title: Wind River Climate Data

description: Hourly air temperature, relative humidity, photosynthetic photon flux density and rain data from a low density white spruce stand on the Wind River in the Arctic National Wildlife Refuge, eastern Brooks Range.
DOI: 10.18739/a27h1dn0c
title: Agashashok Climate Data

description: Hourly air temperature, relative humidity, photosynthetic photon flux density and rain data from a low density white spruce stand on the Agashashok River in the western Brooks Range.
DOI: 10.18739/a23t9d67t
title: Wind River Sap Flux

description: Hourly sap flux data for the growing seasons of 2013-2016 in a low density white spruce stand on the Wind River in the Arctic National Wildlife Refuge, eastern Brooks Range.
DOI: 10.18739/a2028pd5z
title: Dietrich Sap Flux

description: Hourly sap flux data for the growing seasons of 2013-2016 in a low density white spruce stand on the Dietrich River in the central Brooks Range.
DOI: 10.18739/a2v97zs0k
title: Agashashok Ring Widths

description: Ring width data for mature white spruce trees growing in a low density stand near the Agashashok River in the western Brooks Range.
DOI: 10.15468/dl.jdyye6
title: Occurrence Download

description: A dataset containing 170238 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Human Observation",
 "Country is Canada",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "PublishingOrg is e2e717bf-551a-4917-bdc9-4fa0f342c530",
 "TaxonKey is Branta canadensis (Linnaeus, 1758)",
 "Year 1995-2009"
 ]
}

 The dataset includes 170238 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027679-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2qj77z5q
title: Carbon Isotopes in Tree-ring Cellulose

description: Carbon isotopic composition of tree-ring alpha-cellulose from mature white spruce trees near the Agashashok, Kugururok, Dietrich and Wind Rivers in the Brooks Range, Alaska.
DOI: 10.18739/a2ks6j50h
title: Needle Dark Respiration

description: Measurements of instantaneous mid-day dark respiration of white spruce needles at sites on the Agashashok, Kugururok, Dietrich and Wind Rivers in the Brooks Range, Alaska. Measurements were made on three or four occasions at each site during the 2013 and 2014 growing seasons. In 2013, measurements were made at the Kugururok, Dietrich and Wind River sites. In 2014, measurements were made at the Agashashok, Dietrich and Wind River sites.
DOI: 10.18739/a2g15tb62
title: Foliar Nutrients

description: Concentrations of nitrogen (N), phosphorus (P) and potassium (K) in white spruce needles sampled near the Agashashok, Kugururok, Dietrich and Wind Rivers in the Brooks Range.
DOI: 10.18739/a2b853j3s
title: Dietrich Climate Data

description: Hourly air temperature, relative humidity, photosynthetic photon flux density and rain data from a low density white spruce stand on the Dietrich River in the central Brooks Range.
DOI: 10.18739/a26m3342c
title: Agashashok Sap Flux

description: Hourly sap flux data for the growing seasons of 2014 and 2016 in a low density white spruce stand on the Agashashok River in the western Brooks Range.
DOI: 10.18739/a22v2c993
title: Kugururok Ring Widths

description: Ring width data for mature white spruce trees growing in a mixed stand of white spruce and balsam poplar near the Kugururok River in the western Brooks Range.
DOI: 10.18739/a2z31np41
title: Dietrich Ring Widths

description: Ring width data for mature white spruce trees growing in a low density stand near the Dietrich River in the central Brooks Range.
DOI: 10.18739/a2tb0xv9s
title: Wind River Ring Widths

description: Ring width data for mature white spruce trees growing in a low density stand near the Wind River in the eastern Brooks Range.
DOI: 10.18739/a2pk0724z
title: Passive acoustic data from A3 in the Bering Strait for July 2015

description: Passive acoustic data from instruments on moorings in the Bering Strait region. The data for this instrument were collected at 66.76 N latitude and 168.95 W longitude. Data were recorded from 10 Hz - 8192 Hz (16 kHz sample rate) the first 10 minutes of each hour from July 2013-July 2014 and 10 Hz - 4096 Hz (8 kHz sample rate) the first 20 minutes of each hour from July 2014- July 2015.
DOI: 10.18739/a2f18sf79
title: Tunu, Greenland 2013 ice core chemistry

description: This is part of continuous aerosol-related glaciochemical measurements of the Tunu 2013 ice cores collected from NE Greenland in 2013.
DOI: 10.18739/a29c6s16w
title: Sea ice and ocean water vapor isotopes

description: A warming climate results in sea ice loss and impacts to the Arctic water cycle. The water isotope parameter deuterium excess, a moisture source proxy, can serve as a tracer to help understand hydrological changes due to sea ice loss. However, unlocking the sea ice change signal of isotopes from ice cores requires understanding how sea ice changes impact deuterium excess, which is unknown. Here we present the first isotope data linking a gradient of sea ice extents to oceanic water vapor deuterium excess values. Initial loss of sea ice extent leads to lower deuterium excess moisture sources, and then values progressively increase with further ice loss. Our new process-based interpretation suggests that past rapid (1–3 years) Greenland ice core changes in deuterium excess during warming might not be the result of abrupt atmospheric circulation shifts, but rather gradual loss of sea ice extent at northern latitude moisture sources. 
These data are in the following publication: Klein, E. S., and J. M. Welker (2016), Influence of sea ice on ocean water vapor isotopes and Greenland ice core records, Geophys. Res. Lett., 43, doi:10.1002/2016GL071748.
DOI: 10.18739/a25m6273m
title: Passive acoustic data from A4 in the Bering Strait for July 2015

description: Passive acoustic data from instruments on moorings in the Bering Strait region. The data for this instrument were collected at 65.75 N latitude and 168.25 W longitude. Data were recorded from 10 Hz - 4096 Hz (8 kHz sample rate) the first 20 minutes of each hour from July 2014- July 2015.
DOI: 10.18739/a21v5bd8c
title: Cloud occurrence and layering at Arctic atmospheric observatories: Atqasuk, Alaska

description: This data set contains cloud occurrence and layering data for Atqasuk, Alaska. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.
DOI: 10.15468/dl.qqacjg
title: Occurrence Download

description: A dataset containing 19017 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Festuca violacea Ser. ex Gaudin)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 2000"
 ]
}

 The dataset includes 19017 records from 61 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027698-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2x34ms2t
title: Cloud occurrence and layering at Arctic atmospheric observatories: Summit, Greenland

description: This data set contains cloud occurrence and layering data for Summit, Greenland. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.
DOI: 10.18739/a2sb3wz82
title: Cloud occurrence and layering at Arctic atmospheric observatories: Eureka, Canada

description: This data set contains cloud occurrence and layering data for Eureka, Canada. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.
DOI: 10.15468/dl.qegdzc
title: Occurrence Download

description: A dataset containing 102 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((-0.02309 40.66124,-0.01804 40.65101,-0.00907 40.6485,-0.00345 40.64766,0.01371 40.64854,0.02079 40.65051,0.00481 40.6751,-0.00077 40.67832,-0.00752 40.67909,-0.01732 40.67851,-0.02309 40.66124))",
 "TaxonKey is Basidiomycota"
 ]
}

 The dataset includes 102 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027699-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2nk3654q
title: Cloud occurrence and layering at Arctic atmospheric observatories: SHEBA

description: This data set contains cloud occurrence and layering data for the Surface Heat Budget of the Arctic (SHEBA) surface-based sites. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.
DOI: 10.18739/a2ht2gc12
title: Cloud occurrence and layering at Arctic atmospheric observatories: NyAlesund, Norway

description: This data set contains cloud occurrence and layering data for Ny'Alesund, Norway. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.
DOI: 10.18739/a2d50fx9f
title: Cloud occurrence and layering at Arctic atmospheric observatories: Barrow, Alaska

description: This data set contains cloud occurrence and layering data for Barrow, Alaska. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.
DOI: 10.18739/a28c9r46n
title: BGOS Mooring In Situ pCO2 and pH time-series

description: These time-series were collected on moorings deployed as part of the Beaufort Gyre Observing System. SAMI-CO2 and SAMI-pH sensors were deployed at ~35 m depth. These data were accompanied by ADCP data and profiler data collected by Rick Krishfield et al. (WHOI). See http://www.whoi.edu/page.do?pid=66559 for information about the mooring locations and for access to additional mooring data.
DOI: 10.15468/dl.bm7pym
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON ((37.38583 -5.645833, 37.3825 -5.645833, 37.3825 -5.646667, 37.38083 -5.646667, 37.38083 -5.6475, 37.38 -5.6475, 37.38 -5.648333, 37.37833 -5.648333, 37.37833 -5.649167, 37.3775 -5.649167, 37.3775 -5.65, 37.37583 -5.65, 37.37583 -5.650833, 37.375 -5.650833, 37.375 -5.651667, 37.37417 -5.651667, 37.37417 -5.6525, 37.37333 -5.6525, 37.37333 -5.654013, 37.40417 -5.670185, 37.40417 -5.660833, 37.40333 -5.660833, 37.40333 -5.658333, 37.4025 -5.658333, 37.4025 -5.6575, 37.4025 -5.656667, 37.40167 -5.656667, 37.40167 -5.655, 37.40083 -5.655, 37.40083 -5.653333, 37.4 -5.653333, 37.4 -5.6525, 37.39833 -5.6525, 37.39833 -5.651667, 37.3975 -5.651667, 37.3975 -5.650833, 37.39583 -5.650833, 37.39583 -5.65, 37.395 -5.65, 37.395 -5.649167, 37.39333 -5.649167, 37.39333 -5.648333, 37.39167 -5.648333, 37.39167 -5.6475, 37.39 -5.6475, 37.39 -5.646667, 37.38667 -5.646667, 37.38667 -5.645833, 37.38583 -5.645833))",
 "TaxonKey is Mammalia"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027700-241107131044228/datasets/export for details.