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77 results for “circumpolar”
Arctic Boreal Annual Burned Area, Circumpolar Boreal Forest and Tundra, V2, 2002-2022
This dataset provides annual cumulative end-of-season burned area in circumpolar boreal forests and tundra for the years 2002-2022. The data were generated using the Arctic Boreal Burned Area (ABBA) version 2 algorithm with MODIS collection 6 products. The algorithm is based on Normalized Burned Ratio differencing (dNBR) and is designed specifically to capture late season fires. The annual MODIS Vegetation Continuous Fields (VCF) 250-m Collection 5.1 (MOD44B) product allowed for additional vegetation-dependent dNBR thresholds within the algorithm's processing steps. The spatial domain is circumpolar regions above 50 degrees north latitude. The data are provided in cloud-optimized GeoTIFF format with 463-m resolution.
Circumpolar Arctic Vegetation, Geobotanical, Physiographic Maps, 1982-2003
This data set provides the spatial distributions of vegetation types, geobotanical characteristics, and physiographic features for the circumpolar Arctic tundra biome for the period 1982-2003. Specific attributes include dominant vegetation, bioclimate subzones, floristic subprovinces, landscape types, lake coverage, Arctic treeline, elevation, and substrate chemistry data. Vegetation indices, trends, and biomass estimate products for the circumpolar Arctic through 2010 are also provided.
ABoVE: Level-4 WRF-STILT Footprint Files for Circumpolar Receptors, 2016-2019
This dataset provides Weather Research and Forecasting (WRF) Stochastic Time-Inverted Lagrangian Transport (STILT) Footprint data products for receptors (observations) located at positions along flight paths and at various fixed observing sites at circumpolar locations at northern latitudes during 2016-2019. Each aircraft and station position is treated as an independent receptor in the WRF-STILT model in order to simulate the land surface influence on observed atmospheric constituents. The footprints are independent of chemical species and can be applied to different flux models and incorporated into formal inversion frameworks. The particle trajectories that determine the footprint field are constrained only by the outer edges of the WRF modeling domain. The measurements included in this data set are crucial for understanding changes in Arctic carbon cycling and the potential threats posed by the thawing of Arctic permafrost.
Arctic Circumpolar Distribution and Soil Carbon of Thermokarst Landscapes, 2015
This data set provides the distribution of thermokarst landscapes in the boreal and tundra ecoregions within the northern circumpolar permafrost zones. This dataset provides an areal estimate of wetland, lake, and hillslope thermokarst landscapes as of 2015. Estimates of soil organic carbon (SOC) content associated with thermokarst and non-thermokarst landscapes were based on available circumpolar 0 to 3 meter SOC storage data.
BOREAS RSS-10 TOMS Circumpolar One-Degree PAR Images
The BOREAS RSS-10 team investigated the magnitude of daily, seasonal, and yearly variations of PAR from ground and satellite observations. This data set contains satellite estimates of surface-incident photosynthetically active radiation (PAR, 400-700 nm, MJ m-2) at 1 degree spatial resolution. The spatial coverage is circumpolar from latitudes of 41 to 66 degrees N latitude. The temporal coverage is from May through September for years 1979 through 1989. Eleven-year statistics are also provided: mean, standard deviation, and coefficient of variation for 1979-1989. The PAR estimates were derived from the global gridded ultraviolet reflectivity data product (average of 360, 380 nm) from the Nimbus-7 Total Ozone Mapping Spectrometer (TOMS). Image mask data are provided for identifying the boreal forest zone, and ocean/land and snow/ice covered areas. The data are available as binary image format data files. Companion files include example thumbnail images that may be viewed and the image data files downloaded using a convenient viewer utility.
ABoVE: Level-4 WRF-STILT Particle Trajectories for Circumpolar Receptors, 2016-2019
This dataset provides Weather Research and Forecasting (WRF) Stochastic Time-Inverted Lagrangian Transport (STILT) particle trajectory files for receptors located at positions along flight paths and at various fixed observing sites at circumpolar locations above 45 degrees North during 2016-2019. The particle files describe the motion of particles released backward in time over a 10-day period. The particle files are separated into archives by platform type (some platforms are combined) and can be characterized as either low resolution or high resolution depending on whether the subsequent footprint fields were generated on a circumpolar 0.5-degree grid (low-resolution) or both 0.5-degree and 0.1-degree grids (high-resolution). The platforms include flux towers at fixed sites, laboratory measurements of whole air samples collected by Programmable Flask Packages (PFP) onboard aircraft, and observations by NASA's Orbiting Carbon Observatory-2 satellite. These particle files were thinned to retain particle location information only when the particles have non-zero contributions to the corresponding footprint field. These particle files are used to compute the footprint fields available in a companion dataset. The particle trajectories that determine the footprint field are constrained only by the outer edges of the WRF modeling domain. Likewise, the companion footprint files are provided on a regular latitude-longitude grid. This dataset extends previous research on the atmospheric transport of land-surface emissions of greenhouse gases by the Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE) project. In particular, the content of the low-resolution particle files is similar to those for the CARVE dataset.
Tree Canopy Cover for the Circumpolar Taiga-Tundra Ecotone: 2000-2005
This data set provides a map of selected areas with defined tree canopy cover over the circumpolar taiga-tundra ecotone (TTE). Canopy cover was derived from the 500-meter MODIS Vegetation Continuous Fields (VCF) product as averaged over six years from 2000-2005 and processed as described in Ranson et al. (2011). This process identified patches of low tree canopy cover which are indicative of the transition from forest to tundra and differentiate the circumpolar taiga–tundra ecotone for the 2000–2005 period. The TTE is the Earth's longest vegetation transition zone and stretches for more than 13,400 km around Arctic North America, Scandinavia, and Eurasia. In Eurasia, the map extends from 60 degrees N to 70 degrees N, and in North America from 50 degrees N to 70 degrees N, excluding Baffin Island in northeastern Canada and the Aleutian Peninsula in southwestern Alaska. Note that for this product, taiga is being used one and the same as boreal forest.This circumpolar TTE area was classified according to VCF tree canopy cover.
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?
<p>Datasets for the Journal of Geophysical Research: Oceans publication: "Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?"</p> <p>[Abstract] Uncertainty exists in the time-mean total transport of the Antarctic Circumpolar Current (ACC), the world’s strongest ocean current. The two most recent observational programs in Drake Passage, DRAKE and cDrake, yielded transports of 141 and 173.3 Sv, respectively. In this paper, we use a realistic 1/12° global ocean simulation to interpret these observational estimates and reconcile their differences. We first show that the modeled ACC transport in the upper 1000 m is in excellent agreement with repeat shipboard acoustic Doppler current profiler (SADCP) transects and that the exponentially decaying transport profile in the model is consistent with the profile derived from repeat hydrographic data. By further comparing the model results to the cDrake and DRAKE observations, we argue that the modeled 157.3 Sv transport, i.e. approximately the average of the cDrake and DRAKE estimates, is actually representative of the time-mean ACC transport through the Drake Passage. The cDrake experiment overestimates the barotropic contribution in part because the array undersampled the deep recirculation southwest of the Shackleton Fracture Zone, whereas the surface geostrophic currents used in the DRAKE estimate yielded a weaker near-surface transport than implied by the SADCP data. We also find that the modeled baroclinic and barotropic transports are not correlated, thus monitoring either baroclinic or barotropic transport alone may be insufficient to assess the temporal variability of the total ACC transport.</p>
Silene uralensis aggregate, circumpolar species : dataset, Novaseq Illumina RAW READS SET 2
<p>This dataset includes 16 samples of circumpolar species included in the <em>Silene uralensis</em> aggregate, sensu http://panarcticflora.org/. Forty-eight low copy nuclear genes were enriched with <em>Silene-</em>specific probes. The samples were sequenced with the Novaseq technology from the short read Illumina platform. An excel sheet with samples information is included.</p> <p>Two other datasets are associated to this one, called "Silene uralensis aggregate, circumpolar species : dataset, Novaseq Illumina RAW READS SET 1" on Zenodo 10.5281/zenodo.12699639 and "Silene uralensis aggregate, circumpolar species : dataset, Miseq Illumina RAW READS" on Zenodo 10.5281/zenodo.12688714. These three datasets belong to a study about phylogenetics in the circumpolar <em>Silene uralensis</em> aggregate. </p>
Silene uralensis aggregate, circumpolar species : dataset, Novaseq Illumina RAW READS SET 1
<p>This dataset includes 16 samples of circumpolar species included in the <em>Silene uralensis</em> aggregate, sensu http://panarcticflora.org/. Forty-eight low copy nuclear genes were enriched with <em>Silene-</em>specific probes. The samples were sequenced with the Novaseq technology from the short read Illumina platform. An excel sheet with samples information is included.</p> <p>Two other datasets are associated to this one, called "Silene uralensis aggregate, circumpolar species : dataset, Novaseq Illumina RAW READS SET 2" on Zenodo 10.5281/zenodo.12700012 and "Silene uralensis aggregate, circumpolar species : dataset, Miseq Illumina RAW READS" on Zenodo 10.5281/zenodo.12688714. These three datasets belong to a study about phylogenetics in the circumpolar <em>Silene uralensis</em> aggregate. </p> <div> <div> <div> </div> <div> <div> <div> </div> <div> <p> </p> <p> </p> </div> </div> </div> </div> </div>
Circumpolar Flaw Lead System Study
Measurements taken within the Cape Bathurst flaw lead on board the icebreaker C.C.G.S. Amundsen to examine how physical changes affect biological processes in the flaw lead through an entire annual cycle (October 2007 - August 2008). The circumpolar flaw lead occurs each year when the central pack ice moves away from the coastal fast ice creating an area of open water called a flaw lead.
Waking the Bear: Understanding Circumpolar Bear Ceremonialism, Version 1
For centuries, Indigenous peoples across Eurasia and North American have maintained harmonious relations with bears with whom they share the world, honoring this relationship through elaborate ceremonies. At present, this website describes the bear ceremonies of Siberian people, the Mansi and the Khanty, through a rich narrative illustrated by photos, videos, and audio recordings. The content is in both English and Russian.Between 2021 to 2022, the research project aims to reach out to Native American and First Nations communities in the United States and Canada, whose concern has been indicated by the unique Grizzly Bear Treaty of 2016, initiated by the Piikani First Nation of Canada and signed by representatives of more than a hundred tribes. The hope is that the website might provide the focus for a future, multidisciplinary Indigenous-led forum on sharing the world with bears and other-than-human persons.
Northern Circumpolar Soils Map, Version 1
This data set consists of a circumpolar map of dominant soil characteristics, with a scale of 1:10,000,000, covering the United States, Canada, Greenland, Iceland, northern Europe, Russia, Mongolia, and Kazakhstan. The map was created using the Northern and Mid Latitude Soil Database. The map is in ESRI Shapefile format, consisting of 11 regional areas.. Polygons have attributes that give the percentage polygon area that is a given soil type. The map shows the dominant soil of the spatial polygon unless the polygon is over 90 percent rock or ice. It also shows the proportion of polygon encompassed by the dominant soil or nonsoil. Soils include turbels, orthels, histels, histosols, mollisols, vertisols, aridisols, andisols, entisols, spodosols, inceptisols (and hapludolls), alfisols (cryalf and udalf), natric great groups, aqu-suborders, glaciers, and rocklands. Data are available via ftp.
Subspecies and Distribution. A. l. lagopus Linnaeus, 1758 — most of the circumpolar range, in all Arctic tundra habitats. A. L beringensis Merriam, 1902 — Russia (Commander Is). A. L. fuliginosus Bechstein, 1799 — Iceland, Greenland, Svalbard. A.L pribilofensis Merriam, 1902 — Alaska (Pribilof Is). in Canidae
Subspecies and Distribution. A. l. lagopus Linnaeus, 1758 — most of the circumpolar range, in all Arctic tundra habitats. A. L beringensis Merriam, 1902 — Russia (Commander Is). A. L. fuliginosus Bechstein, 1799 — Iceland, Greenland, Svalbard. A.L pribilofensis Merriam, 1902 — Alaska (Pribilof Is).
Circumpolar Flaw Lead System Study
Measurements taken within the Cape Bathurst flaw lead on board the icebreaker C.C.G.S. Amundsen to examine how physical changes affect biological processes in the flaw lead through an entire annual cycle (October 2007 - August 2008). The circumpolar flaw lead occurs each year when the central pack ice moves away from the coastal fast ice creating an area of open water called a flaw lead.
Distribution. Circumpolar in the Southern Ocean. in Phocidae
Distribution. Circumpolar in the Southern Ocean.
Distribution. Circumpolar in the Southern Ocean. in Phocidae
Distribution. Circumpolar in the Southern Ocean.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.