{{title}}

{{description}}

View Record
Search
Collections
Record Type
79
ISO Topics
Primary Organization
Funding Organization
Primary Contact
Other Contact
Status
Data Types
Regions
Dates
Tags

79 results found Displaying entries 1 - 20 of 79 in total

Circumpolar Arctic Substrate pH

Aga circumpolar substrate ph 2003 Alaska Geobotany Center (AGC) - Differences in substrate chemistry have important effects on dominant plant communities. Some of the most important effects are related to soil pH, which governs 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 are often unavailable in acidic soils (pH < 5.5) or in soils...
Complete
2019-08-19 14:04:17 -0800
9trmurq3zu agc logo 144
Data
Full Record

Circumpolar Arctic AVHRR Summer Warmth Index 1982-2003 (Raynolds et al. 2008)

Aga circumpolar avhrr swi 1982 2003 Alaska Geobotany Center (AGC) - This data set was calculated from monthly AVHRR thermal infrared data (Comiso 2003). Summer Warmth Index (SWI) is the sum of monthly mean temperatures above 0 degrees Celsius. The months of May-September were evaluated for the years 1982 - 2003 (Raynolds et al. 2008). Back to [Circumpolar Arctic Vegetation Map](/catalog/entries/5503-circumpolar-arctic-vegetation-map-cavm-team-2003) **Map...
Complete
2019-08-15 13:37:09 -0800
9trmurq3zu agc logo 144
Data
Full Record

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
9trmurq3zu agc logo 144
Data
Full Record

Circumpolar Arctic Bioclimate Subzones

Aga circumpolar bioclimate 2003 Alaska Geobotany Center (AGC) - A fundamental problem for the CAVM is how to characterize the transitions in vegetation that occur across the roughly 10 °C mean July temperature gradient from the tree line to the coldest parts of the Arctic. 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...
Complete
2019-08-16 12:51:25 -0800
9trmurq3zu agc logo 144
Data
Full Record

Upper Kuparuk River Region Surficial Geology

Aga upper kuparuk surfgeol walker 2008 Alaska Geobotany Center (AGC) - Surficial geology affects vegetation patterns and disturbance recovery rates. Surficial geology was grouped into the following classes for map display: • Glacial till deposit: Glacial till in the region was deposited during the Sagavanirktok and Itkillik glaciations (mid and late Pleistocene). Till surfaces are generally rocky and gently undulating with blockfields, and nonsorted circles....
Complete
2019-08-15 14:19:41 -0800
9trmurq3zu agc logo 144
Data
Full Record

Ivotuk Vegetation Maps (Reidel et al. 2005)

Alaska Geobotany Center (AGC) - The Ivotuk study site is located in northwestern Alaska, on the North Slope of the Brooks Mountains Range. The study site was chosen because four tundra vegetation types, moist acidic tundra (MAT), moist nonacidic tundra (MNT), mossy tussock tundra, and shrub tundra exist within a 2 km^2 area. This project was funded by the NSF Arctic System Sciences, Land-Atmosphere-Ice Interactions Program...
Unknown
1999-01-01
2005-12-31
2019-08-16 13:06:22 -0800
9trmurq3zu agc logo 144 6jc8g1ukz3 nsf
Data
Full Record

Toolik Lake Area Percent Water

Aga toolik area pctwater walker 2008 Alaska Geobotany Center (AGC) - Map of the Toolik Lake research area percent water. The amount of water (lakes, ponds, streams, wetlands), strongly affects the reflectance of the land surface over large areas of Alaska. The percent water was based on the number of AVHRR water pixels in each polygon divided by the number of pixels in each polygon. The classes of water coverage in a polygon were reported as follows: 0%,...
Complete
2019-08-16 14:20:12 -0800
9trmurq3zu agc logo 144
Data
Full Record

Upper Kuparuk River Region NDVI trend 1985-2007 (Raynolds et al 2010)

Aga upper kuparuk landsat ndvi trend 1985 2007 Alaska Geobotany Center (AGC) - Landsat TM and ETM data were used to calculate NDVI for the study area (823 km^2). This image shows the results of a slope of linear regression of NDVI for 1985, 1989, 1995, 1999, 2004, 2007. Only pixels with significant trends (p < 0.05) area shown. The research was funded by NSF grants for studying the Greening of the Arctic and Seasonality: NSF grants OPP-0120736, ARC-0531180, and...
Complete
2019-08-14 15:06:19 -0800
9trmurq3zu agc logo 144 6jc8g1ukz3 nsf
Data
Full Record

Toolik Lake Grid Surficial Geology

Aga toolik grid surfgeol walker 2008 Alaska Geobotany Center (AGC) - The Toolik Lake Grid map focuses on the south side of Toolik Lake. This area is one of the principal intensive research areas at the Toolik Lake Field Station. It includes many experimental research sites where long-term observations and experiments are being conducted, including the greenhouse and snow-fence experiments. The grid was constructed in 1989 to provide geographic referencing for...
Complete
2019-08-16 13:47:14 -0800
9trmurq3zu agc logo 144
Data
Full Record

Kuparuk River Basin Elevation Map

Ku topo u6 Alaska Geobotany Center (AGC) - Kuparuk River Basin elevation (m) is a grid map (tif) with 30-m pixels. Data are taken from the GTOPO30 global digital elevation model (DEM) (Gesch et al. 1999) and are at approximately 1 km spacing. Back to [Kuparuk River Basin](/catalog/entries/5450-kuparuk-river-basin-vegetation-map-walker-1997) Go to **Website Link :: Toolik Arctic Geobotanical Atlas** below for details on legend...
Complete
2019-08-15 14:04:02 -0800
9trmurq3zu agc logo 144
Data
Full Record

Toolik Lake Grid Glacial Geology

Aga toolik grid glacgeol walker 2008 Alaska Geobotany Center (AGC) - The Toolik Lake Grid map focuses on the south side of Toolik Lake. This area is one of the principal intensive research areas at the Toolik Lake Field Station. It includes many experimental research sites where long-term observations and experiments are being conducted, including the greenhouse and snow-fence experiments. The grid was constructed in 1989 to provide geographic referencing for...
Complete
2019-08-16 13:42:34 -0800
9trmurq3zu agc logo 144
Data
Full Record

NSSI Landcover GIS Data: Landcover Mapping for North Slope of Alaska (Ducks Unlimited, 2013)

Nslandcover Alaska Geobotany Center (AGC) - Data is provided as raster GIS layer in .img format. The project final report is included in the full data download or can be downloaded separately. This map is the outcome of a multi-year project to produce a moderate resolution landcover base map for the North Slope of Alaska to serve as a primary base layer for long-term science and planning activities on the North Slope. New Landsat...
Complete
2019-08-26 13:56:56 -0800
09 43 17 665 fws 300x300 Ducksunlimitedlogo 17 15 15 907 alcc logo primary 600 9trmurq3zu agc logo 144 15 21 35 16 nssi trans
Data
Full Record

Landsat Land Cover Map of Northern Alaska (Muller et al. 1999)

Aga northslope landcover muller 1999 This map was created for the US National Science Foundation Land-Atmosphere-Ice Interactions (LAII) Flux Study and the Arctic Transitions in the Land-Atmosphere System (ATLAS) Study (OPP-9318530 and OPP-9415554). The map covers all of northern Alaska, from the Brooks Range divide to the coast. It is a raster (tif) map, with 50 m pixels, and 9 land cover categories. It is based on an...
Complete
1998-06-01
2019-08-02 12:01:37 -0800
6jc8g1ukz3 nsf
Data
Full Record

Toolik Lake Grid Geobotanical

Walker%26maier 2008 side 2 Alaska Geobotany Center (AGC) - The Toolik Lake grid map focuses on the 1.2-km2 research grid on the south side of Toolik Lake. This area is one of the principal intensive research areas at the Toolik Lake Field Station. It includes many experimental research sites where long-term observations and experiments are being conducted, including the greenhouse and snow-fence experiments. The grid was constructed in 1989 to provide...
Complete
2008-01-01
2008-12-31
2019-08-16 13:41:05 -0800
9trmurq3zu agc logo 144
Data
Full Record

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
2019-08-26 13:59:23 -0800
9trmurq3zu agc logo 144
Data
Full Record

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
9trmurq3zu agc logo 144
Data
Full Record

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
9trmurq3zu agc logo 144
Data
Full Record

Patterned-Ground 10 x 10 m Grids (Raynolds et al. 2005)

Alaska Geobotany Center (AGC) - This mapping includes six locations along the Dalton Highway and in the Prudhoe Bay Oilfield area, forming a north-south transect across the climate gradient on the North Slope of Alaska. From south to north, the locations are Happy Valley, Sagwon, Franklin Bluffs, Deadhorse, West Dock, and Howe Island. At each location, 10 x 10 m grids were mapped to characterize the heterogeneity of...
Complete
2019-08-20 13:59:19 -0800
9trmurq3zu agc logo 144 6jc8g1ukz3 nsf
Data
Full Record

Circumpolar Arctic Floristic Provinces Map

Aga circumpolar floristic 2003 Alaska Geobotany Center (AGC) - Floristic sectors characterize the considerable east-west floristic variation within the subzones. The more northern Arctic bioclimate subzones have a relatively consistent core of Arctic plant species that occur around the circumpolar region. Further south, local east-west variation is related to a variety of factors, including different paleohistories and the greater climatic heterogeneity....
Complete
2019-08-16 12:53:02 -0800
9trmurq3zu agc logo 144
Data
Full Record

Circumpolar Arctic AVHRR NDVI Trend 1982-2008 (Bhatt et al. 2010)

Aga circumpolar 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 13:35:35 -0800
9trmurq3zu agc logo 144
Data
Full Record