5,889 Works

Collaborative research: Spatial and temporal variability of surface albedo and light absorbing chemical species in Greenland.

Michael Bergin
The collaborative team will take advantage of the currently funded Greenland Inland Traverse (GrIT) traveling between Thule and Summit Greenland to access a spatially diverse area of the GIS in order to better understand albedo variability and the snow properties that influence albedo. The GrIT route offers a unique opportunity to study a wide range of snow accumulation zones (i.e. the ablation zone, soaked snow zone, the percolation zone and the dry snow zone) across...

Understanding the Wave-Driven Circulation and Variability of the Polar Atmosphere through Coordinated Observation, Analysis, and Modeling

Richard Collins
The goal of this investigation is to understand the wave-driven circulation and variability of the polar atmosphere through an integrated study that combines satellite measurements, lidar measurements, meteorological analyses, and model simulations will be conducted. This study is an international collaboration between investigators at six institutions in Germany, Japan and the United States. An international network of four Rayleigh lidars located in observatories at Andoya, Norway (69°N, 16°E), Chatanika, Alaska (65°N, 147°W), Kangarlussuaq, Greenland (67°N,...

Collaborative Research: The Distributed Biological Observatory (DBO)-A Change Detection Array in the Pacific Arctic Region

Jacqueline Grebmeier
The Arctic is changing. The Distributed Biological Observatory studies these changes in the northern Bering and Chukchi seas. Investigators sample locations that are biologically important in U.S. territorial waters. These locations have been sampled annually since 2010. Other investigators also sample the same locations. As a result, the locations are sampled multiple times a year. Data are collected on environmental conditions including water column and sea floor animals that are food for whales, seals, and...

Late Quaternary Sea Ice History of the Beringian Arctic Gateway

Ben Pelto
Sea ice extent in the Arctic Ocean and its marginal seas is a key component of the coupled ice-atmosphere-ocean system and a driver of meridional ocean circulation, yet information about sea ice conditions in the past is very limited. The goals of this proposed study are two-fold. The first is to use archived surface sediments collected from the Bering and Chukchi Seas to develop quantitative measures of seasonal sea-ice extent and duration. This will be...

High frequency (HF) radar depth sounding dataset, Greenland, 2016

John Paden & Jilu Li
To better understand processes affecting the ice sheets and to supply boundary condition information into ice sheet models and ice thickness for other ice sheet analysis, the Center for Remote Sensing of Ice Sheets (CReSIS) has designed, developed, and deployed a near high frequency (33-37 MHz) radar depth sounder in Greenland. An uninhabited aerial vehicle (UAV), dubbed the G1XB, was modified to carry this HF sounder. This dataset contains data collected at Russell Glacier in...

Functional trait and survival data for seed and seedling transplant experiments of alpine Nabalus spp. at Whiteface Mountain in Wilmington, NY, USA, July through September 2017

Kristen Haynes
These datasets contain survival, seed establishment, and functional trait data for seeds and seedlings of the plants Nabalus boottii (Syn: Prenanthes boottii), Nabalus trifoliolatus var. nanus, and non-alpine Nabalus trifoliolatus. Seeds and seedlings from low and high elevation were transplanted at low, mid, and high elevation on Whiteface Mountain in Wilmington, New York, and grown for two months, the approximate length of the alpine growing season. Using these data, we assessed the fitness (i.e. survival)...

Population genetics of a climate-indicating predator across the forest-tundra ecotone

Derek Taylor
Subarctic freshwater lakes and ponds in Alaska are important oases for polar biodiversity and resources for arctic peoples. However, this habitat is also among the most sensitive to disturbances such as heavy metal pollution, eutrophication, and drainage or desiccation from climate warming. Environmental indicator species in freshwater have both acted as sentinels for ongoing change and as proxies for historical change. Phantom midges (Chaoborus), for example, are among the most important freshwater dipterans for aquatic...

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The holographic map as a conditional expectation

Thomas Faulkner

Collaborative research: What role do glaciers play in terrestrial sub-arctic hydrology?

Seth Campbell
The overall project assessed the linkages and controls of a subarctic glacier-permafrost hydrological system from a watershed-scale perspective using field measurements, remote sensing and numerical modeling. Jarvis Creek (634km2), which feeds the Delta and Tanana River in Interior Alaska, was studied as a proxy of the observed mountain glacier melting and permafrost degradation that has been documented across the Arctic region in recent decades. The specific objectives were to 1) assess the hydrologic fluxes (including...

Moss-associated Nitrogen (N2) fixation rate measurements from Toolik Field Station, Anchorage, and Fairbanks in 2016 and 2017

Julia Stuart & Michelle Mack
During late June 2016, 10 sites were sampled near Fairbanks, Alaska and 4 sites sampled near Toolik Field Station, Alaska. The following year, in June 2017, an additional 10 sites were sampled in the Anchorage, Alaska area. Sites were selected for accessibility, lack of disturbance, and presence of moss. Each site was comprised of one 30 meters (m) transect and 6 subplots at 5 m intervals along the transect. Environmental variables of interest such as...

Mooring Observations from the Atlantic Water Inflow Experiment (ATWAIN) from September 21, 2012 through September 19, 2013

Leah McRaven
The overall goal of this study is to obtain a quantitative description of the water mass composition, kinematics, and dynamics of the Atlantic water boundary current in the eastern Arctic Ocean over an annual cycle, in order to elucidate the role of the current in regulating the Arctic system. The project is part of a larger cooperative program entitled the Atlantic Water Inflow Experiment (ATWAIN), which is an international collaboration between six institutions: The Woods...

Photogrammetric scans of aerial photographs of North American glaciers, 1996

, Austin S. Post, William Hauer, Alexander Zinck & Shad O'Neel
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...

Hydroxyl (OH) airglow image data, Alaska, 2012

Kim Nielsen
Airglow image data of various emissions are stored in .png image format. The filename indicates the observation site (PFRR = Poker Flat Research Range), the observation time (year, month, day, hour, min, and sec) of image acquisition start, and finally the emission identifier follows (for example OH or Na). Please note that this data set is the RAW data and contain the entire set of images obtained during the project period. This include high, medium,...

Photogrammetric scans of aerial photographs of North American glaciers, 1995

, Austin S. Post, William Hauer, Alexander Zinck & Shad O'Neel
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...

Chinese National Arctic Research Expedition (CHINARE)Conductivity-Temperature-Depth (CTD) data collected by the Xue Long, Barrow Canyon, Chukchi Sea, 2010

Jian-Feng He
This data has been collected and submitted as part of the Distributed Biological Observatory (DBO) program. Data were originally collected as part of the CHINARE project, headed by He Jianfeng (hejianfeng@pric.org.cn). Conductivity-Temperature-Depth (CTD) data were taken aboard the MV Xue Long. During this cruise, data were taken along the established repeat hydrography transect, DBO5. This submission includes CTD data from the DBO5 transect. There are nine cnv data files containing the following parameters: pressure, depth,...

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Collaborative Research: Asynchrony in the timing of goose-vegetation interactions: implications for biogeochemical cycling in wet sedge tundra

Karen Beard & Jeffrey Welker
Terrestrial high-latitude ecosystems are experiencing dramatic increases in temperature, changes in precipitation, and advancement of the growing season with important implications for trophic interactions. Uncoupling of the temporal relationships between migratory animals and the phenology of the forage they rely on for energy, nutrition, and rearing of young is one of the most glaring consequences of these changes. Furthermore, herbivores in high latitudes are likely to mediate biogeochemical responses to climate change substantially altering ecosystem...

Photogrammetric scans of aerial photographs of North American glaciers, 1970

, Austin S. Post, William Hauer, Alexander Zinck & Shad O'Neel
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...

Hydroxyl (OH) airglow image data, Alaska, January 2012

Kim Nielsen
Airglow image data of various emissions are stored in .png image format. The filename indicates the observation site (PFRR = Poker Flat Research Range), the observation time (year, month, day, hour, min, and sec) of image acquisition start, and finally the emission identifier follows (for example OH or Na). Please note that this data set is the RAW data and contain the entire set of images obtained during the project period. This include high, medium,...

Detecting the phylogenetic signal of glacial refugia in a bryodiversity hotspot outside the tropics

Ernest Wu
Glacial refugia have likely been important in shaping diversity gradients outside the tropics. However, the biogeographical histories of most species within glacial refugia remain unclear. We examined the geographic range structure and phylogenetic attributes of the mosses of Haida Gwaii, a putative glacial refugium and ‘hotspot’ of moss diversity off the northwest coast of British Columbia. We found that many species have widespread, but disjunct distributions, typically with few close relatives on the islands. We...

Firth River Tree Ring Data [Anchukaitis, K.]

Kevin Anchukaitis, Rosanne D'Arrigo, David Frank, Laia Hayles & Brendan Buckley
Northwestern North America has one of the highest rates of recent temperature increase in the world, but the putative "divergence problem" in dendroclimatology potentially limits the ability of tree-ring proxy data at high latitudes to provide long-term context for current anthropogenic change. Here, summer temperatures are reconstructed from a Picea glauca maximum latewood density (MXD) chronology that shows a stable relationship to regional temperatures and spans most of the last millennium at the Firth River...

O-Buoy15 Deployment

William Simpson
This data set contains O-Buoy Deployment data. Daily, hourly or continuous measurements over Arctic Ocean sea ice of ozone (O3), carbon dioxide (CO2), bromine monoxide (BrO), wind speed and direction, air temperature and relative humidity (RH), barometric pressure, latitude and longitude, Universal Coordinated Time (UTC), horizon pictures, heading, pitch and roll *** SEE INSTRUMENT README FILES IN DATASET *** These are level 1 data, unfiltered. *Data are current as of 2016-01-20.

Collaborative Research: The NEEM Deep Ice Core

Ian Baker, Edward Brook, Jeff Severinghaus & Todd Sowers
The North Eemian (NEEM) Deep Ice Core Project was designed to acquire a new ice core in northern Greenland. NEEM is an international effort, led by the glaciology group at the University of Copenhagen. More than a dozen countries have expressed a desire to participate. The US is a main partner in NEEM and is already providing about one-third of the logistics costs needed to collect the ice core. US scientists will take the lead...

Arctic Shorebird Demographics Network

Richard B. Lanctot, Stephen Brown & Brett K. Sandercock
See "01_ASDN_readme.txt" (under "Download Data" tab) for data author and contact information. Field data on shorebird ecology and environmental conditions were collected from 1993-2014 at 16 field sites in Alaska, Canada, and Russia. Data were not collected in every year at all sites. Studies of the population ecology of these birds included nest-monitoring to determine timing of reproduction and reproductive success; live capture of birds to collect blood samples, feathers, and fecal samples for investigations...

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  • 2020
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