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Displaying entries 41 - 60 of 128 in total

Alaska Arctic Elevation Map

Aga arctic ak elevation 1993 Alaska Geobotany Center (AGC) - Elevation strongly influences soil moisture and patterns of tundra plant communities. Areas less than 100 m above sea level were separated to show low-elevation plains. Areas above 100 m elevation were divided into 333-m intervals to show decreases of about 2 °C, as predicted by the adiabatic lapse rate of 6 °C per 1000 m. This corresponds to the change in mean July temperature between...
Complete
2019-08-19 12:54:01 -0800
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Alaska Arctic False Color-Infrared (CIR) Map

Aga arctic ak avhrr cir 1995 Alaska Geobotany Center (AGC) - Advanced Very High Resolution Radiometer (AVHRR) data were obtained from the USGS Global AVHRR 10-day composite data (http://edcdaac.usgs.gov/1KM/1kmhomepage.asp) (Markon et al. 1995). Glaciers and oceans were masked out using information from the Digital Chart of the World (ESRI 1993). The image is composed of 1 x 1-km pixels. The color of each pixel was determined by its reflectance at the...
Complete
2019-08-19 14:00:33 -0800
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Alaska Arctic Floristic Provinces Map

Aga arctic ak floristic 2005 Alaska Geobotany Center (AGC) - The Arctic has a relatively consistent core ofplant species that occur throughout the circumpolar region, but there is also considerable east to west variation in regional floras, particularly in the southern bioclimate subzones. These differences are due to factors such as different histories related to glaciations, land bridges, and north-south trending mountain ranges that have influenced...
Complete
2019-08-19 13:57:32 -0800
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Alaska Arctic Lake Cover Map

Aga arctic ak lake cover 2005 1 Alaska Geobotany Center (AGC) - Lake cover strongly affects the reflectance of the land surface over large areas of Alaska, and was useful for identifying extensive wetlands. Lake cover was based on the number of AVHRR water pixels in each mapped polygon, divided by the number of pixels in the polygon. Since the imagery has a pixel size of 1 km^2, lake cover is underestimated for areas with many small lakes. Pixels within 2...
Complete
2019-08-15 13:14:09 -0800
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Alaska Arctic Landscape Map

Aga arctic ak landscape 2005 Alaska Geobotany Center (AGC) - The landscape physiography map displays regions of plains, hills, mountains, glaciers and lakes. Generally, plains are flat or gently rolling landscapes less than 200 m above sea level. Hills are more dissected than plains (more surface roughness) and are 200-500 m in elevation. Mountains have greater surface roughness and are above 500 m in elevation. The Alaska Arctic Tundra Vegetation Map is...
Complete
2019-08-19 13:58:19 -0800
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Alaska Arctic Substrate Chemistry Map

Aga arctic ak substrate 2005 Alaska Geobotany Center (AGC) - Differences in substrate chemistry, including pH, govern the availability of essential plant nutrients. Soils in the circumneutral range (pH 5.5-7.2) are generally mineral rich, whereas the full suite of essential nutrients is often unavailable in acidic soils (pH < 5.5) or in soils associated with calcareous bedrock (pH > 7.2). The latter often have unique assemblages of plant species. The...
Complete
2019-08-19 13:58:49 -0800
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Alaska Arctic Tundra Vegetation Map (Raynolds et al. 2006)

Akfront Alaska Geobotany Center (AGC) - The Alaska Arctic Tundra Vegetation Map (AATVM) is a geoecological map of the Arctic Tundra within Alaska. It includes areas north and west of the forest boundary and excludes areas that have a boreal flora such as the Aleutian Islands and alpine tundra regions south of treeline. The map expands on the Alaska portion of the [Circumpolar Arctic Vegetation...
Complete
2019-08-16 12:42:33 -0800
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Alaska Arctic Vegetation Map

Aga arctic ak vegetation 2005 Alaska Geobotany Center (AGC) - Mapped polygons at 1:7.5 million scale contain many vegetation types. The map portrays the zonal vegetation within each mapped polygon. Zonal sites are areas where the vegetation develops under the prevailing climate, uninfluenced by extremes of soil moisture, snow, soil chemistry, or disturbance, and are generally flat or gently sloping, moderately drained sites, with fine-grained soils...
Complete
2019-08-19 13:59:19 -0800
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AVA-AK: Arctic Network (Jorgenson et al. 2009)

Aava arcticnetworknps tjorgenson 2009 plotmap Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Arctic Network. Vegetation sampling for an ecological land survey classification and landcover map was completed for the over 19.5 million acres encompassed by the Bering Land Bridge National Preserve, Cape Krusenstern National Monument, Gates of the Arctic National Park and Preserve, Kobuk Valley National Park and Noatak National Preserve. The study was...
Complete
2002-07-10
2008-08-10
2019-09-27 16:33:25 -0800
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AVA-AK: ATLAS-1 (Atqasuk, Barrow, Ivotuk, Oumalik) Vegetation Studies (Edwards et al. 2000)

Aava atlas1 dwalker 2000 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive-Alaska: ATLAS-1. Vegetation from 15 releves within 8 different grids at Barrow, Atqasuk, Ivotuk and Oumalik were described as part of the NSF-funded Arctic Transition in Land-Atmosphere System (ATLAS) project. The full ATLAS Transect also includes locations at Council and Quartz Creek, which are in the ATLAS-2 dataset (Raynolds et al. 2002). The focus of the ATLAS...
Complete
1998-01-01
2000-06-22
2019-09-27 16:35:38 -0800
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AVA-AK: Barrow DOE NGEE-Arctic (Sloan et al. 2014)

Barrow%20doe%20ngee%20%28brw vs%29%20pic%20by%20rich%20norby Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Barrow DOE NGEE-Arctic. As part of a larger study to understand the structure and function of Arctic terrestrial ecosystems response to climate change, 48 vegetation study plots were established at the Barrow Environmental Observatory, NGEE Intensive Sampling Site 1, Areas A-D. Species cover and plot specific environmental data were recorded in 2012....
Complete
2012-07-17
2012-07-21
2019-09-27 16:42:42 -0800
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AVA-AK: Frost Boil Vegetation Plots (Kade et al. 2005)

Aava frostboils akade 2005 locationmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Frost Boil Vegetation Plots. The vegetation associated with cryoturbated frost-heave features on the North Slope, Alaska was described by Kade et al. (2005) as part of the "Biocomplexity associated with biogeochemical cycles in arctic frost-boil ecosystems" project (National Science Foundation grant OPP-0120736) from 2002 to 2006. The study sites spanned...
Complete
2000-08-16
2003-08-09
2019-09-27 17:01:28 -0800
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AVA-AK: Happy Valley Vegetation Plots (Walker et al. 1997)

Aava happyvalley dwalker 1997 a sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Happy Valley Vegetation Plots. The Happy Valley research site is located along the Sagavanirktok River in a glaciated valley of the northern Arctic Foothills of the Brooks Range. Vegetation of the Happy Valley research site was described and mapped by Walker et al. through the Institute of Arctic and Alpine Research, Tundra Ecosystem Analysis and Mapping...
Complete
1994-07-18
1994-07-28
2019-09-27 17:06:51 -0800
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AVA-CA: High Arctic Canada, Isachsen, Ellef Ringnes Is. Vegetation Plots (Vonlanthen et al. 2008)

Aava hacisachsen cvonlanthen 2008 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive-Canada: High Arctic Canada, Isachsen, Ellef Ringnes Island Vegetation Plots. The vegetation of 52 plots at Isachsen (the now closed High Arctic Weather Station) on Ellef Ringnes Island, Canada was studied as part of a multi-year project focused on patterned-ground plant communities. Patterned ground includes circles, polygons, nets, hummocks, and other features...
Complete
2005-07-22
2005-07-29
2019-09-27 17:14:43 -0800
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AVA-CA: High Arctic Canada, Mould Bay, Prince Patrick Is. Vegetation Plots (Vonlanthen et al. 2008)

Aava hacmldbay cvonlanthen 2008 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Canada: High Arctic Canada, Mould Bay, Prince Patrick Island Vegetation Plots. The vegetation at Mould Bay on Prince Patrick Island, Canada was studied as part of a multi-year project focused on patterned-ground plant communities. Patterned ground includes circles, polygons, nets, hummocks, and other features caused by differential freezing processes in soils....
Complete
2004-07-18
2004-07-24
2019-09-27 17:17:20 -0800
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Atqasuk

Alaska Geobotany Center (AGC) - Komarkova maps with 2 themes. They are currently in a paper/mylar version and need to be digitized and will be available here in the future.
Unknown
2019-08-15 14:01:10 -0800
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Barrow

Alaska Geobotany Center (AGC) - D. A. Walker IBP site and topogrid with 7 themes. These are currently in a paper/mylar version and need to be digitized. Once complete, they will be available for download here. D. A. Walker. 1977. The Analysis of the Effectiveness of a Television Scanning Densitometer for Indicating Geobotanical Features in an ice-Wedge Polygon Complex at Barrow, Alaska. M.A. University of Colorado, Boulder.
Unknown
2019-08-14 13:59:49 -0800
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Beechey Point Land Cover Classification: CRREL Report 87-5

Aga beecheypointquad landsat vegetation 1987 Alaska Geobotany Center (AGC) - This report presents a Landsat-derived land cover classification of the Beechey Point, Alaska, 1:250,000-scale quadrangle with descriptions of the major vegetation units. Eight Landsat-level units deri neds from multispectral scanner data, eleven photo-interpreted units, and eight common vegetation complexes are described and illustrated. Procedures of Landsat analysis, field methods, and...
Complete
1987-04-01
2019-08-19 12:47:31 -0800
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CANADIAN TRANSECT FOR THE CIRCUMPOLAR ARCTIC VEGETATION MAP (1999)

Gonzalez etal 2000 Alaska Geobotany Center (AGC) - Variations in vegetation cover and species composition related to climate are evident from the southern to northern Arctic. Scientists involved in the Circumpolar Arctic Vegetation Mapping (CAVM) project and undergraduate students in a University of Minnesota field course conducted a north-south transect in the Canadian Arctic in order to investigate this large-scale variation in vegetation....
Complete
2000-05-01
2019-08-15 13:26:31 -0800
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Circumpolar Arctic AVHRR False Color-Infrared (CIR) Map

Aga circumpolar avhrr cir 1995 Alaska Geobotany Center (AGC) - Advanced Very High Resolution Radiometer (AVHRR) data were obtained from the USGS Global AVHRR 10-day composite data. (http://edcdaac.usgs.gov/1KM/1kmhomepage.asp) (Markon et al. 1995). Glaciers and oceans were masked out using information from the Digital Chart of the World (ESRI 1993). The image is composed of 1 x 1-km pixels. The color of each pixel was determined by its reflectance at the...
Complete
2019-08-16 12:49:41 -0800
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