Figure 1. Map showing location of Alaskan CALM grids with 6-year record, transects, and physiographic regions.
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D2, 8168, doi:10.1029/2001JD000927, 2003
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[7] CALM's initial focus was on two series of sites in northern Alaska, both of which were derived in part from antecedent observation programs. The regional network is comprised of two north-south transects across the North Slope (Figure 1), oriented along the regional climatic gradient [Clebsch and Shanks, 1968; Haugen, 1982]. The Western Transect consists of sites at Barrow and Atqasuk on the Coastal Plain, and Ivotuk in the Arctic Foothills. Because the latter site was established much later than the others, this paper treats only the Barrow-Atqasuk portion of the transect. The Kuparuk transect, 340 km to the east, parallels the Dalton Highway and the Trans-Alaska Pipeline System (TAPS) from Prudhoe Bay on the Coastal Plain to Toolik Lake in the northern foothills of the Brooks Range. ARCSS/CALM grids are located within the Kuparuk River basin at Betty Pingo and West Dock on the Coastal Plain, Happy Valley in the Sagwon Upland, and Toolik Lake and Imnavait Creek in the Arctic Foothills. ARCSS/CALM sites along the Kuparuk Transect grew out of several research programs, including U.S. Army Cold Regions Research and Engineering Laboratory (CRREL) activities in the Prudhoe Bay Oil Field [Brown, 1975; Walker et al., 1980], the U.S. Environmental Protection Agency's R4D program [Reynolds and Tenhunan, 1996], and scientific investigations at the University of Alaska's Toolik Lake Field Station. The five grids comprising the Kuparuk transect were in place by 1994, and were used intensively by the Arctic Flux Study [Kane and Reeburgh, 1998].
Citation: Spatial and temporal patterns of active layer thickness at Circumpolar Active Layer Monitoring (CALM) sites in northern Alaska, 1995–2000, J. Geophys. Res., 108(D2), 8168, doi:10.1029/2001JD000927, 2003.