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Displaying entries 1 - 20 of 127 in total

Alaska Arctic Vegetation Archive: ATLAS-2 (Raynolds et al. 2002)

Aava atlas2 mraynolds 2000 plotmap anc Alaska Geobotany Center (AGC) - The ATLAS-2 dataset is part of larger NSF-funded Arctic Transition in Land-Atmosphere System (ATLAS) project. ATLAS-2 contains the Seward Peninsula portion of the project with 52 plots at Council and Quartz Creek. The full ATLAS Transect also includes 15 releves at locations on the North Slope at Barrow, Atkasuk, Oumalik, and Ivotuk which are in the ATLAS-1 dataset (Edwards et al. 2000). The...
Complete
2000-07-11
2000-07-29
2019-08-13 12:41:30 -0800
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Alaska Arctic Vegetation Archive: Arrigetch Peaks (Cooper 1983)

Aava arrigetchpeask dcooper 1983 sitephoto metadata Alaska Geobotany Center (AGC) - The vegetation of Arrigetch Peaks was described and mapped by David J. Cooper for his PhD thesis funded by National Park Service. Located in the Endicott Mountains of the central Brooks Range, the vegetation of of the Arrigetch Peaks is uniquely influenced by both latitude and altitude (Cooper 1986b). A reconnaissance of the area was completed in in 1976, while most of the data were collected...
Complete
1976-01-01
1983-12-31
2019-08-13 12:37:19 -0800
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Alaska Arctic Vegetation Archive: Flux Towers-Zona (Barrow, Atqasuk, Ivotuk) Vegetation Plots (Davidson et al. 2016a, Davidson et al. 2016b)

Sitephoto composite fluxtwrzona Alaska Geobotany Center (AGC) - Vegetation plots within the Flux Towers-Zona project eddy covariance tower footprints at Barrow: (three towers) including the Barrow Environmental Observatory Flux Tower (BEO), Barrow Biocomplexity Experiment South Tower (BES), and Climate Monitoring and Diagnostics Laboratory Flux Tower (CMDL), at Atqasuk: the Atqasuk Flux Tower (ATQ), and at Ivotuk: Ivotuk Flux Tower (IVO), were described by...
Complete
2014-07-18
2014-08-31
2019-08-13 14:05:34 -0800
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Alaska Arctic Vegetation Archive: High Arctic Canada, Green Cabin, Banks Island Vegetation Plots (Vonlanthen et al. 2008)

Aava hacgrncabin cvonlanthen 2008 plotmap anc Alaska Geobotany Center (AGC) - The vegetation at Green Cabin on Banks Island, Canada were studied as part of a multi-year project focused on the bicomplexity of patterned-ground plant communities. Patterned ground includes circles, polygons, nets, hummocks, and other features caused by differential freezing processes in soils. Vegetation plot data were collected at Green Cabin, during July 8-12, 2003. The primary source...
Complete
2003-07-08
2003-07-12
2019-08-13 14:17:10 -0800
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Alaska Arctic Vegetation Archive: Imnavait Creek Vegetation Plots (Walker et al. 1987a)

Aava imnavaitcreek dwalker 1987a a sitephoto metadata Alaska Geobotany Center (AGC) - Vegetation in the vicinity of the Imnavait Creek field site located in the Upper Kuparuk watershed of the Brooks Range was described by D.A. Walker et al. as part of a study that was initiated in the summer of a Department of Energy R4D (Response, Resistance, Resilience and Recovery from Disturbance) project. Imnavait Creek was chosen as a study site as it provides a good representation of the...
Complete
1984-08-01
1985-09-04
2019-08-13 14:20:36 -0800
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The Alaska Arctic Vegetation Archive (AVA-AK)

Phyt http://dx.doi.org/10.1127/phyto/2016/0128 Phytocoenologia 46:221-229 Walker, D.A. 2016 The Alaska Arctic Vegetation Archive (AVA-AK, GIVD-ID: NA-US-014) is a free, publically available database archive of vegetation-plot data from the Arctic tundra region of northern Alaska. The archive currently contains 24 datasets with 3,026 non-overlapping plots. Of these, 74% have geolocation data with...
Complete
2016-09-01
2018-08-09 15:17:13 -0800
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Alaska Arctic AVHRR NDVI Map

Aga arctic ak avhrr ndvi 1995 Alaska Geobotany Center (AGC) - The normalized difference vegetation index (NDVI) is a measure of greenness. NDVI was calculated as: NDVI = (NIR - R) / (NIR + R), where NIR is the spectral reflectance in the AVHRR near-infrared channel (0.725-1.1 µm, channel 2) where light-reflectance from the plant canopy is dominant, and R is the reflectance in the red channel (0.5 to 0.68 µm, channel 1), the portion of the spectrum where...
Complete
2019-08-15 13:33:22 -0800
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Alaska Arctic Bioclimate Subzone Map

Aga arctic ak bioclimate 2005 Alaska Geobotany Center (AGC) - Various authors, working with different geobotanical traditions, have divided the Arctic into bioclimatic regions using a variety of terminologies. The origins of these different terms and approaches have been reviewed by the Panarctic Flora (PAF) initiative (Elvebakk 1999). The PAF and CAVM accepted a five-subzone version of the Russian zonal approach. The subzone boundaries are somewhat...
Complete
2019-08-15 13:34:19 -0800
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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
2019-08-15 13:11:57 -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
2019-08-15 13:12:35 -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
2019-08-15 13:13:16 -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
2019-08-15 13:14:50 -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
2019-08-15 13:15:57 -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
2019-08-15 13:17:27 -0800
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Alaska Arctic Vegetation Archive: NPR-A ANHP (Boucher et al. 2014)

Alaska Geobotany Center (AGC) - Pending evaluation.
Unknown
2019-08-13 14:47:40 -0800
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Alaska Arctic Vegetation Archive: Arctic Network (Jorgenson et al. 2009)

Aava arcticnetworknps tjorgenson 2009 plotmap Alaska Geobotany Center (AGC) - 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 accomplished over an eight-year period (2002-2009) by...
Complete
2002-07-10
2008-08-10
2019-08-13 12:36:44 -0800
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Alaska Arctic Vegetation Archive: ATLAS-1 (Atqasuk, Barrow, Ivotuk, Oumalik) Vegetation Studies (Edwards et al. 2000)

Aava atlas1 dwalker 2000 plotmap anc Alaska Geobotany Center (AGC) - 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 project was to improve understanding of...
Complete
1998-01-01
2000-06-22
2019-08-13 12:38:20 -0800
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Alaska Arctic Vegetation Archive: Atqasuk Vegetation Plots (Komárková & Webber 1980; Villarreal 2013)

Aava atqasuk 1980 sitephoto Alaska Geobotany Center (AGC), Systems Ecology Lab, University of Texas El Paso (SEL at UTEP) - The Atqasuk vegetation plots were originally described and mapped by Drs. Vera Komárková and Patrick J. Webber in 1975 as part of the Research on Arctic Tundra Environments (RATE) project. These sites were resampled in 2000 and 2010 and assessed for community change as part of the 'IPY Back to the Future: Resampling old research sites to assess changes in high latitude terrestrial ecosystem...
Complete
1975-07-01
2010-07-01
2019-08-13 12:45:32 -0800
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