Arctic patterned-ground ecosystems: A synthesis of field studies and models along a North American Arctic Transect

  • Authors: Walker, D. A.; Epstein, H. E.; Romanovsky, V. E.; Ping, C. L.; Michaelson, G. J.; Daanen, R. P.; Shur, Y.; Peterson, R. A.; Krantz, W. B.; Raynolds, M. K.; Gould, W. A.; Gonzalez, G.; Nicolsky, D. J.; Vonlanthen, C. M.; Kade, A. N.; Kuss, P.; Kelley, A. M.; Munger, C. A.; Tarnocai, C. T.; Matveyeva, N. V; Daniëls, F. J. A.
  • Publication Year: 2008
  • Publication Series: Scientific Journal (JRNL)
  • Source: Journal of Geophysical Research
  • DOI: 10.1029/2007JG000504

Abstract

Arctic landscapes have visually striking patterns of small polygons, circles, and hummocks. The linkages between the geophysical and biological components of these systems and their responses to climate changes are not well understood. The “Biocomplexity of Patterned Ground Ecosystems” project examined patterned-ground features (PGFs) in all five Arctic bioclimate subzones along an 1800-km trans-Arctic temperature gradient in northern Alaska and northwestern Canada. This paper provides an overview of the transect to illustrate the trends in climate, PGFs, vegetation, n-factors, soils, active-layer depth, and frost heave along the climate gradient. We emphasize the thermal effects of the vegetation and snow on the heat and water fluxes within patterned-ground systems. Four new modeling approaches build on the theme that vegetation controls microscale soil temperature differences between the centers and margins of the PGFs, and these in turn drive the movement of water, affect the formation of aggradation ice, promote differential soil heave, and regulate a host of system properties that affect the ability of plants to colonize the centers of these features. We conclude with an examination of the possible effects of a climate warming on patterned-ground ecosystems.

  • Citation: Walker, D. A.; Epstein, H. E.; Romanovsky, V. E.; Ping, C. L.; Michaelson, G. J.; Daanen, R. P.; Shur, Y.; Peterson, R. A.; Krantz, W. B.; Raynolds, M. K.; Gould, W. A.; Gonzalez, G.; Nicolsky, D. J.; Vonlanthen, C. M.; Kade, A. N.; Kuss, P.; Kelley, A. M.; Munger, C. A.; Tarnocai, C. T.; Matveyeva, N. V.; Daniëls, F. J. A. 2008. Arctic patterned-ground ecosystems: A synthesis of field studies and models along a North American Arctic Transect. Journal of Geophysical Research. 113(G3): 165-. https://doi.org/10.1029/2007JG000504.
  • Keywords: permafrost, thermal regime, tundra, soils, impacts of climate change
  • Posted Date: February 5, 2015
  • Modified Date: August 11, 2021
  • Print Publications Are No Longer Available

    In an ongoing effort to be fiscally responsible, the Southern Research Station (SRS) will no longer produce and distribute hard copies of our publications. Many SRS publications are available at cost via the Government Printing Office (GPO). Electronic versions of publications may be downloaded, printed, and distributed.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • To view this article, download the latest version of Adobe Acrobat Reader.