All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 958 302 22
PDF Downloads 775 267 16

The Microclimates of the Arctic Tundra

Gunter WellerGeophysical Institute, University of Alaska, Fairbanks 99701

Search for other papers by Gunter Weller in
Current site
Google Scholar
PubMed
Close
and
Bjorn HolmgrenGeophysical Institute, University of Alaska, Fairbanks 99701

Search for other papers by Bjorn Holmgren in
Current site
Google Scholar
PubMed
Close
Full access

Abstract

The microclimates of the arctic tundra at Barrow, Alaska, are described for the near-surface terrestrial layers in which most biological activities take place. Temperature profiles are constructed from detailed measurements in the air, vegetation and soil, from 16 m above to 6 m below the tundra surface. Wind and radiation measurements supplement these data. Considering the tundra as a two-dimensional heat exchange surface, daily components of the heat balance are computed and summarized for a number of periods throughout the year, which are characterized by changes of the physical nature of the tundra surface such as appearance and disappearance of snow, meltwater and precipitation, and growth and decay of vegetation. Through changes in surface terrain parameters such as albedo and roughness length, and availability of water for phase changes, the thermal and moisture regimes of the near-surface layer change markedly during these periods as reflected by the heat balance.

Abstract

The microclimates of the arctic tundra at Barrow, Alaska, are described for the near-surface terrestrial layers in which most biological activities take place. Temperature profiles are constructed from detailed measurements in the air, vegetation and soil, from 16 m above to 6 m below the tundra surface. Wind and radiation measurements supplement these data. Considering the tundra as a two-dimensional heat exchange surface, daily components of the heat balance are computed and summarized for a number of periods throughout the year, which are characterized by changes of the physical nature of the tundra surface such as appearance and disappearance of snow, meltwater and precipitation, and growth and decay of vegetation. Through changes in surface terrain parameters such as albedo and roughness length, and availability of water for phase changes, the thermal and moisture regimes of the near-surface layer change markedly during these periods as reflected by the heat balance.

Save