Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p22a..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P22A-02
Mathematics
Logic
0702 Permafrost (0475), 1625 Geomorphology And Weathering (0790, 1824, 1825, 1826, 1886), 5416 Glaciation, 6225 Mars, 9310 Antarctica (4207)
Scientific paper
Buried glacier ice rests beneath a 40-80 cm thick layer of sublimation till in central Beacon Valley, Antarctica. We applied a diffusion model to track vapor flux within the till to assess long-term stability of subsurface ice. As input, we used meteorological data from HOBO data loggers that captured changes in solar radiance, atmospheric temperature, relative humidity, soil temperature, soil moisture, and wind speed and direction from November 2004 to January 2007. Additional factors influencing ice stability that are not addressed in the present model include surface roughness, turbulence, and the growth and mobilization of secondary ices and salts. Results show that ice loss is extremely sensitive to minor perturbations in air temperature and relative humidity, and that vapor flows into and out of the sublimation till at rates dependent on the non-linear variation of soil temperature with depth. Current annual ice loss is calculated at 0.07 mm in central Beacon Valley. Net loss of buried glacier ice during summer months (equaling >90% of total annual ice loss) is reduced to zero if average summertime air temperatures decrease from -7°C to -12°C, or average summertime RH increases from 36% to 58%, or infiltration of minor snowmelt increases to ~0.002 mm per day. Such changes in summertime conditions could be achieved with an increase in average cloud cover. An understanding of the range of physical processes affecting buried ice in the Antarctic Dry Valleys, Earth's closest terrestrial analog for Mars, is helpful in defining factors that could potentially alter the stability and evolution of near-surface ice on Mars.
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