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National Park Service Natural Resource Program Center National Park Service

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The National Park Service (NPS) approved the use of Calcium Chloride as a dust suppressant on the Park road after four years of research. A formal monitoring program to track the spatial and temporal movement of CaCl2 concentrations along the Park road began in 2005. Fifteen terrestrial sites and fourteen water body locations were selected to monitor the movement of chloride from the roadbed into roadside soils and surface waters. Initial results showed wide variability in chloride concentrations in soil adjacent to the roadbed, while waterbodies generally had low concentrations (ABR 2006). This report presents 2007 results for the dust palliative chloride monitoring program.During the summer of 2007, 35 applications...
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Normalized difference vegetation index (NDVI) derived from AVHRR and MODIS satellitesensors is summarized in five northern Alaskan National Park Service units dominated by arctictundra. NDVI is an index of vegetation productivity that is closely related to the warmth ofsummer growing seasons in the arctic. Mean NDVI for ecological sections (broad landscapescalemapping units) is highest for densely vegetated lowlands, lowest in sparsely vegetated highmountain areas, and intermediate in lowlands with significant area of lakes. NDVI during greenup(June) varies 20 to 40% between years, while peak NDVI and late-season NDVI vary 10 to20% between years. These short-term variations are closely linked to current-year variations...
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This report summarizes methods and results for an aerial Dall’s sheep (Ovis dalli dalli) survey conducted in 2008 by the National Park Service Arctic Network Inventory and Monitoring Program, with support from the Alaska Department of Fish and Game, in the northeastern portion of Gates of the Arctic National Park and Preserve, Alaska. This area includes the Itkillik Preserve, where the highest densities of Dall’s sheep in the Park and Preserve have been found, and both subsistence and sport hunting are allowed. Approximately 1905 km2 of delineated habitat were surveyed via small, fixed-wing aircraft from 9-14 July. Sheep groups were counted and classified as lambs, ewe-like sheep (ewes, yearlings and rams with less...
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