cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a25m62724
title: Longitudinal variation in the physiology, growth and reproduction of white spruce at the Arctic treeline in Alaska

description: The position of the Arctic treeline is an important regulator of surface energy budgets, carbon cycling, habitat availability and subsistence resources in high latitude environments. Changes in the health and spatial extent of the arctic forest are largely governed by relationships among climate and the physiology, growth and reproductive success of the trees. Previous work along a longitudinal gradient in the Brooks Range, Alaska, showed a pattern of declining growth in response to rising temperatures from west to east. This study aims to uncover the processes underlying this trend and examine the implications for reproductive success and the establishment of new trees beyond the current treeline. Its goals are to measure and compare tree microclimates of the western, central and eastern Brooks Range; compare and contrast continuous measurements of white spruce canopy gas exchange over several growing seasons in the western, central and eastern Brooks Range in order to evaluate the relative importance of drought stress and cold soils at the arctic treeline in Alaska; make detailed measurements of the seasonality and magnitude of growth in all major organs of white spruce in the western, central and eastern Brooks Range, assess the potential for shifts in allocation and to more accurately evaluate current and future tree performance; and conduct a detailed study of longitudinal variation in seed production, seed quality, seedling establishment and seedling performance (physiology and growth) within the Brooks Range, as these demographic processes will largely determine whether a treeline will advance, remain static or retreat in response to climate change. Results of the study will inform policy makers and local residents of the likely outcomes of interactions between climate change and the health and spatial extent of the highly sensitive arctic forests of Alaska. The team will reach out to students and adults in rural and urban Alaska through four specific activities. They will extend an existing relationship with biology teachers at Kotzebue High School and visit their classrooms to introduce the importance of vegetation as a mediator of climate change and to share the results of previous and ongoing work in the area. They will provide opportunities for outstanding students from Kotzebue High School to join their research team in the field at the Kugururok site. They will arrange to be interviewed by Kotzebue Public Radio to inform the communities about their research activities and findings, and they will participate in a BLM Campbell Creek Science Center Fireside Chat series. NSF Program: Arctic System Science Program (ARCSS) Sponsor: University of Alaska Anchorage Campus, 3211 Providence Drive, Anchorage, AK 99508-4614
DOI: 10.18739/a21z41t19
title: Passive acoustic data from A4 in the Bering Strait 2014-2015

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/a2x63b57h
title: Cloud occurrence and layering at Arctic atmospheric observatories

description: 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/a2sf2mc2w
title: Cloud microphysical properties at Arctic atmospheric observatories: SHEBA

description: This data set contains cloud microphysical properties data for the Surface Heat Budget of the Arctic (SHEBA) surface-based sites. Cloud microphysical properties determine the manner in which clouds impact atmospheric radiation and the hydrological cycle. This collection of data sets documents vertically-resolved cloud microphysical properties at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensors measurements at each site. A variety of cloud microphysics retrieval algorithms are employed to first identify the cloud type (phase) and then characterize the hydrometeor characteristic size and water content for both liquid and ice phases. While an attempt has been made to maintain consistent retrievals across the different observatories, each has a unique set of cloud observation instruments which can impose unique, site-specific signatures on the retrieval results.
DOI: 10.18739/a2np1wj7n
title: Collaborative Research: Arctic Sensitivity to Climate Perturbations and a Millennial Perspective on Current Warming Derived from Shrinking Ice Caps

description: The goal of this proposal is to provide a millennial context for current warming and to better constrain the nature of abrupt climate changes over the past 5000 years in the North Atlantic sector of the Arctic. This goal will be addressed with
 the powerful datasets derived from radiocarbon-dated vegetation preserved beneath ice caps for centuries to millennia, but now being exposed annually by current ice-margin retreat across northeastern Canada and West Greenland. These chronologies
 define the pattern and timing of abrupt summer coolings in the recent past and place current warming in a millennial context. 14C dating of vegetation will be complemented by measuring in situ 14C inventories in recently exposed rock surfaces,
 providing essential temporal constraints on the duration of ice-covered and ice-free conditions throughout the Holocene. Combined, these two datasets will provide the most secure evidence for the character of current summer warming by explicitly
 dating when the region was last as warm as present. Comparing our climate reconstructions with on-going studies in NW Europe will help to separate the roles of unforced variability from hemispherically symmetric forcing as causes for abrupt climate
 change. Research activities under this award will be made accessible to indigenous peoples by translating the goals and eventual results into Inuktitut, through posters that describe the research, and by offering public lectures in Iqaluit, the
 capital of Nunavut, and at Qikiqtarjuaq, where INSTAAR has long had a presence. This research program will train a PhD and MSc student, and provides opportunities for undergraduate students to become involved with research, building on successful
 traditions from previous years.
DOI: 10.18739/a2hx15r2d
title: Cloud Properties Across the Arctic Basin from Surface and Satellite Measurements - An existing Arctic Observing Network

description: The work of this research grant involves the integration and analysis of measurements from the surface-based sites at SHEBA (Surface Heat Budget of the Arctic), Barrow, and the new observatory in Eureka, Canada, as well as satellite data over the northern polar region. In effect, this project will coordinate existing, yet disparate, Arctic cloud measurements into a coherent network of observations that are useful for understanding the broader roles of clouds in Arctic climate and for evaluating the performance of global models in the Arctic. The researchers will use measurements from a wide array of data sources to address questions related to the spatial and temporal variability of Arctic clouds. This research work addresses many stated objectives and goals for both SEARCH (Study of Environmental Arctic Change) project. SEARCH has identified the need for long-term observations of important Arctic climate parameters, such as clouds, and has recognized the value of coordinated surface-satellite activities, both of which are fundamental components of this grant. By making the link between disparate observations at multiple sites to a comprehensive, long-term cloud data set, this study is a combination of
DOI: 10.15468/dl.8ww9ec
title: Occurrence Download

description: A dataset containing 644 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is France",
 "TaxonKey is Bombus veteranus (Fabricius, 1793)"
 ]
}

 The dataset includes 644 records from 16 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027680-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a28c9r455
title: Cloud microphysical properties at Arctic atmospheric observatories: Eureka, Canada

description: This data set contains cloud microphysical properties data for Eureka, Canada. Cloud microphysical properties determine the manner in which clouds impact atmospheric radiation and the hydrological cycle. This collection of data sets documents vertically-resolved cloud microphysical properties at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensors measurements at each site. A variety of cloud microphysics retrieval algorithms are employed to first identify the cloud type (phase) and then characterize the hydrometeor characteristic size and water content for both liquid and ice phases. While an attempt has been made to maintain consistent retrievals across the different observatories, each has a unique set of cloud observation instruments which can impose unique, site-specific signatures on the retrieval results.
DOI: 10.18739/a2d50fx8z
title: Cloud microphysical properties at Arctic atmospheric observatories

description: Cloud microphysical properties determine the manner in which clouds impact atmospheric radiation and the hydrological cycle. This collection of data sets documents vertically-resolved cloud microphysical properties at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensors measurements at each site. A variety of cloud microphysics retrieval algorithms are employed to first identify the cloud type (phase) and then characterize the hydrometeor characteristic size and water content for both liquid and ice phases. While an attempt has been made to maintain consistent retrievals across the different observatories, each has a unique set of cloud observation instruments which can impose unique, site-specific signatures on the retrieval results.
DOI: 10.18739/a24q7qq5t
title: Cloud microphysical properties at Arctic atmospheric observatories: Barrow, Alaska

description: This data set contains cloud microphysical properties data for Barrow, Alaska. Cloud microphysical properties determine the manner in which clouds impact atmospheric radiation and the hydrological cycle. This collection of data sets documents vertically-resolved cloud microphysical properties at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensors measurements at each site. A variety of cloud microphysics retrieval algorithms are employed to first identify the cloud type (phase) and then characterize the hydrometeor characteristic size and water content for both liquid and ice phases. While an attempt has been made to maintain consistent retrievals across the different observatories, each has a unique set of cloud observation instruments which can impose unique, site-specific signatures on the retrieval results.
DOI: 10.18739/a20z70x2j
title: Investigations of the Long Term Sustainability of Human Ecodynamic Systems in Northern Iceland

description: This project has centered on the Lake Myvatn area of northeastern Iceland. In spite of severe erosion problems, the Myvatn economy has been largely sustainable since the time when Iceland was first settled in the late ninth century. Until the
 early part of the twentieth century, the inhabitants of the region lived almost entirely on the proceeds of the land by farming, fishing for trout, and collecting the eggs of wild birds. In recent times, tourism has become an extremely important part
 of the economy. This brings needed revenue but raises conservation issues in what is a very fragile ecosystem. The interplay between the hydrology and geology of the area has formed a unique landscape characterised by an abundance of pseudo-craters
 and curious lava formations and an ecosystem that is unparalleled in Iceland. In the Myvatn area most resources are directly connected to water. The complex food web and biogeochemistry of the lake has created unique wildlife resources on which
 people depended, and adjacent wetlands produced the most important sources of hay for the animal husbandry practiced in the area. In the past, because of its North Atlantic location, marginal for agriculture, grass was the only viable crop in
 Iceland, and the economy focused primarily on the keeping of sheep and cattle until comparatively recent times. This meant that the success or failure of the grass crop, coupled with winter rangeland grazing, was the one aspect of the economy on
 which all else rested. If there was not enough hay to feed the livestock over the winter, then they could die, and the human population could also suffer with famines and related difficulties. The primary goal of this project was to establish what
 were the varying factors that influenced the success or failure of the grass growth and hay crop and grazing, and the sustainability of the use of these resources. A particularly important part of the project was to examine resource-management
 decisions and to consider to what extent local farmers focused on the long-term sustainability of grazing resources.
DOI: 10.18739/a27h1dm98
title: Diatoms, Grain Size, Magnetic Susceptibility, and Cesium and Lead Isotopes from Short HAPS Cores Collected on the Bering Sea Shelf

description: Regime shift in the Pacific Decadal Oscillation (PDO) and changes in the intensity of the Aleutian Low have manifest significant impacts on the Bering Sea ecosystem from commercially important fisheries to phytoplankton. This leads us to examine Bering Sea shelf sediments in an effort to determine if recent environmental changes are recorded in the sediments deposited over the past half a century. Samples were collected on board the USCGC Healy Icebreaker during May 2006 and June 2007. Haps cores were collected and subsampled either by slicing the sediments at 1 cm intervals or by pushing a polyvinyl chloride (PVC) pipe into the center of the Haps core. The data set archived here contains diatom counts, detailed grain size analysis, magnetic susceptibility, and x-radiographs for a suite of short cores. One core, DBSB, was dated using 210-Pb and 137-Cs. It was found to reach back to 1949 at 13 cm depth. Forty-six diatom taxa are recorded and diatom counts are presented either as raw counts or as relative percent abundances. Grain size is calculated using a laser diffraction particle size analyzer and is reported as weight percent for grain size bins ranging from 0.01 to 3700 Î¼m. Lead and cesium isotopes are reported in Becquerels per gram and magnetic susceptibility is reported in SI units. X-radiographs are archived as images. These data show that the sediments are moderately bioturbated, but still reflect changing environmental conditions since 1950.
DOI: 10.18739/a23r0pt6m
title: Mt. Hunter AWS data

description: Meteorological data and images collected on the Mt. Hunter plateau, Denali National Park, Alaska. Data were collected with an automatic weather station using instrumentation from Campbell Scientific.
 Large-scale atmospheric circulation systems affect the geographic distribution of precipitation in western North America, yet little is known about how these systems may have varied before the instrumental period of the last 150 years. The main goal of this project is to reconstruct the history of precipitation in Alaska during the last thousand years using ice core records of snow accumulation. The researchers plan to collect several new ice cores from the Mt. Hunter Plateau in the Alaska Range of Denali National Park and the new ice cores will be combined with an existing spatial array of ice cores in the region to map changes in the spatial patterns of precipitation. Because changes in atmospheric circulation patterns caused by ENSO and the Pacific Decadal Oscillation (PDO) affect where the precipitation falls, this spatial array of ice cores will provide a record of how these larger scale climate systems have varied during the last thousand years. The project will focus on determining the differences in the precipitation patterns at the Little Ice Age (approximately 200 to 600 years ago) and Medieval Climate Anomaly (approximately 800 to 1,200 years ago).
DOI: 10.18739/a2v698c4k
title: Beaufort Gyre Exploration Project - Mooring A 2004-2005

description: Mooring A (2004-2005) was deployed for 362 days equipped with bottom pressure recorder (20824 samples of pressure, temperature and salinity), McLane Moored Profiler (322 profiles of pressure, temperature, salinity and horizontal velocity), and an upward looking sonar (15633619 samples of pressure, temperature, and ice draft).
DOI: 10.18739/a2000010m
title: Beaufort Gyre Exploration Project - Mooring D 2014-2015

description: Mooring D (2014-2015) was deployed for 379 days equipped with
bottom pressure recorder (36343 samples of pressure, and
temperature), a McLane Moored Profilers (338 profiles of
pressure,temperature, salinity and horizontal velocity), an
upward looking sonar (32697489 samples of pressure, temperature
and ice draft), and an Acoustic Doppler Current Profiler (ADCP,
9097 profiles of zonal (U) and meridional (V) velocity as well as
ice drift).
DOI: 10.18739/a2qf8jk0f
title: Beaufort Gyre Exploration Project - Mooring C 2003-2004

description: Mooring C (2003-2004) was deployed for 360 days equipped with bottom pressure recorder (20721 samples of pressure, temperature and salinity), McLane Moored Profiler (318 profiles of pressure, temperature, salinity and horizontal velocity), and an upward looking sonar (15538760 samples of pressure, temperature, and ice draft).
DOI: 10.18739/a2kp7tr6p
title: Beaufort Gyre Exploration Project - Mooring B 2003-2004

description: Mooring B (2003-2004) was deployed for 358 days equipped with bottom pressure recorder (20585 samples of pressure, temperature and salinity), McLane Moored Profiler (319 profiles of pressure, temperature, salinity and horizontal velocity), and an upward looking sonar (15436160 samples of pressure, temperature, and ice draft).
DOI: 10.18739/a2fx73z3d
title: Beaufort Gyre Exploration Project - Mooring A 2003-2004

description: Mooring A (2003-2004) was deployed for 362 days equipped with bottom pressure recorder (20842 samples of pressure, temperature and salinity), McLane Moored Profiler (180 profiles of pressure, temperature, salinity and horizontal velocity), and an upward looking sonar (15628919 samples of pressure, temperature, and ice draft).
DOI: 10.18739/a2b853j29
title: Dissolved Ba measurements: 2007

description: This data set comprises results from the inductively coupled plasma mass spectrometry (ICPMS) analyses of dissolved Barium (Ba) performed on the samples collected from the upper water column (depth &lt; ~300 m) at the stations occupied in the Canada Basin during the cruise of the Canadian Coast Guard Ship (CCGS) Louis S. St-Laurent in summer 2007 (Cruise No. 2007-20)
DOI: 10.18739/a22r3nx4d
title: Dissolved Ba measurements: 2004

description: This data set comprises results from the Inductively coupled plasma mass spectrometry (ICPMS) analyses of dissolved barium (Ba) performed on the samples collected from the upper water column (depth &lt; ~300 m) at the stations occupied in the Canada Basin during the cruise of the Canadian Coast Guard Ship, CCGS Louis S. St-Laurent in summer 2004 (Cruise No. 2004-16).
DOI: 10.18739/a26h4cq91
title: Dissolved Ba measurements: 2005

description: This data set comprises results from the Inductively coupled plasma mass spectrometry (ICPMS) analyses of dissolved Ba performed on the samples collected from the upper water column (depth &lt; ~300 m) at the stations occupied in the Canada Basin during the cruise of the Canadian Coast Guard Ship CCGS Louis S. St-Laurent in summer 2005 (Cruise No. 2005-04).
DOI: 10.18739/a2z02z88n
title: Dissolved Ba measurements: 2003

description: This data set comprises results from the Inductively coupled plasma mass spectrometry (ICPMS) analyses of dissolved Barium (Ba) performed on the samples collected from the upper water column (depth &lt; ~300 m) at the stations occupied in the Canada Basin during the cruise of the Canadian Coast Guard ship (CCGS) Louis S. St-Laurent in summer 2003 (Cruise No. 2003-21).
DOI: 10.18739/a2t727g4w
title: Hydrographic CCGS Louis S. St-Laurent Cruise CTD and Geochemistry Data 2003-2007

description: This data set contains data from late summer hydrographic cruises conducted in years 2003 through 2007. Conductivity, Temperature, and Depth (CTD) data for each year is archived in a zip file. The zip file contains an ascii formated file for each CTD station. Some stations include data from both the down cast and upcast. Some of the zip files also contain as well as a single matlab-format file combining all the station data. Cruise documentation is also available. Geochemistry data is provided in a separate spreadsheet. The CTD and geochemistry data were produced by researchers at the Institute of Ocean Sciences, Fisheries and Oceans Canada. The principal investigators are Fiona McLaughlin, Eddy Carmack, Sarah Zimmermann, Michiyo Kawai (IOS) and Chris Guay.
DOI: 10.18739/a2pg1hp0r
title: Beaufort Gyre Exploration Project - Mooring C 2007-2008

description: Mooring C (2007-2008) was deployed for 357 days equipped with bottom pressure recorder (17137 samples of pressure, temperature and salinity), McLane Moored Profiler (13 profiles of pressure, temperature, salinity and horizontal velocity), and an upward looking sonar (15450300 samples of pressure, temperature, and ice draft).
DOI: 10.18739/a2jq0sv7g
title: Beaufort Gyre Exploration Project - Mooring D 2007-2008

description: Mooring D (2007-2008) was deployed for 356 days equipped with bottom pressure recorder (no data return), McLane Moored Profiler (313 profiles of pressure, temperature, salinity and horizontal velocity), an upward looking sonar (15364800 samples of pressure, temperature and ice draft), and an Acoustic Doppler Current Profiler (ADCP, 6752 profiles of zonal (U) and meridional (V) velocity as well as ice drift).
DOI: 10.18739/a2f18sf6t
title: Hydrographic CCGS Louis S. St-Laurent Cruise CTD and Geochemistry Data 2008

description: Contains data from late summer hydrographic cruise conducted in 2008. There were 73 Conductivity , Temperature, and Depth (CTD) casts performed aboard the Canadian Coast Guard Ship (CCGS) Louis S. St-Laurent between 17 July and 21 August 2008 in the Canada Basin using a SBE911+ CTD system with 24 10-L Niskins. The CTD data for down and upcasts are provided in 1-db averaged files (*.cnv), in Seabird's text format with one file per cast and separate files for down and up direction. CTD data for each year is archived in a zip file. The zip file contains an ascii formated file for each CTD station. Some stations include data from both the down cast and upcast. Some of the zip files also contain as well as a single matlab-format file combining all the station data. Cruise documentation is also available. Geochemistry data is provided in a separate spreadsheet.