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Antarctic science. 1998 Mar;10(1):31-8. doi: 10.1017/s0954102098000054 Q41.82024

Soil temperatures and stability of ice-cemented ground in the McMurdo Dry Valleys, Antarctica

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C McKay  1, M T Mellon, E I Friedmann

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  • 1 Space Science Division, NASA Ames Research Center, Moffett Field, CA 94035, USA.
  • 2 NASA ARC
  • DOI: 10.1017/s0954102098000054 PMID: 11541256

    摘要 Ai翻译

    Year-round temperature measurements at 1600 m elevation during 1994 in the Asgard Range Antarctica, indicate that the mean annual frost point of the ice-cemented ground, 25 cm below the surface, is -21.7 +/- 0.2 degrees C and the mean annual frost point of the atmosphere is -27.5 +/- 1.0 degrees C. The corresponding mean annual temperatures are -24.9 degrees C and -23.3 degrees C. These results imply that there is a net flux of water vapour from the ice to the atmosphere resulting in a recession of the ice-cemented ground by about 0.4-0.6 mm yr-1. The level of the ice-cemented permafrost is about 12 cm below the level of dry permafrost. The summer air temperatures would have to increase about 7 degrees C for thawing temperatures to just reach the top of the subsurface ice. Either subsurface ice at this location is evaporating over time or there are sporadic processes that recharge the ice and maintain equilibrium over long timescales.

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    期刊名:Antarctic science

    缩写:ANTARCT SCI

    ISSN:0954-1020

    e-ISSN:1365-2079

    IF/分区:1.8/Q4

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    Soil temperatures and stability of ice-cemented ground in the McMurdo Dry Valleys, Antarctica