Filters: Tags: boreal (X) > Categories: Data (X)

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Dissolved organic carbon and nitrogen release from boreal Holocene permafrost and seasonally frozen soils of Alaska Permafrost (perennially frozen) and active-layer (seasonally thawed) soils varying in soil carbon (C) and nitrogen (N) content and radiocarbon age were collected from three sites in interior Alaska to determine potential release of dissolved organic carbon (DOC), total dissolved N (TDN), dissolved organic nitrogen (DON), and dissolved inorganic nitrogen (DIN) upon thaw. Soil cores were cut into 15 cm thick sections, and deep active-layer (15-30 cm above the permafrost boundary) and shallow permafrost (15-30 cm below the permafrost boundary) sections were thawed and leached with deionized water. Soil leachates were analyzed for DOC, TDN, nitrate (NO3-), and ammonium (NH4+) concentrations, dissolved organic matter... Categories: Data; Tags: Alaska, Ecology, Soil Sciences, USGS Science Data Catalog (SDC), Water Quality, All tags... boreal, carbon, carbon-14 analysis, environment, nitrogen, permafrost, water chemistry, Fewer tags Probability of willow occuring for Koyukuk National Wildlife Refuge and vicinity Yukon Flats National Wildlife Refuge (YKF NWR) and Koyukuk NWR (KUK NWR), U.S. Fish and Wildlife Service (USFWS), initiated a project with the U.S. Geological Survey Earth Resources Observation and Science (EROS) Center to acquire map products needed for moose habitat assessment. The objective of this work was to create a suite of products which included: Estimated Vegetation Heights, Willow-Not Willow Estimates, and Vegetation Type Maps. These products are based on spectral characteristics found in bands 2 through 7 of Landsat 8 OLI scenes processed to surface reflectances, acquired in summer of 2013, and late winter of 2014. Training data was collected by fixed wing aircraft and helicopter by USFWS refuge staff,... Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Boreal, Height, Innoko Flats, Alaska, Koyukuk National Wildlife Refuge, Alaska, Landsat, All tags... Lidar, Willow, boreal, Fewer tags