A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica
We developed a simulation model for terrestrial sites including sensible heat exchange between the atmosphere and ground surface, inter- and intra-layer heat conduction by rock and soil, and shortwave and longwave radiation. Water fluxes included snowmelt, freezing/thawing of soil water, soil capill...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:geog_fac-1004 2023-05-15T13:58:46+02:00 A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica Hunt, H. W. Fountain, Andrew G. Doran, Peter T. Basagic, Hassan J. 2010-01-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geog_fac/5 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1004&context=geog_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geog_fac/5 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1004&context=geog_fac Geography Faculty Publications and Presentations McMurdo Dry Valleys (Antarctica) Antarctica -- Environmental conditions McMurdo Dry Valleys (Antarctica) -- Soil temperature -- Models Environmental Sciences Geology Glaciology text 2010 ftportlandstate 2022-01-09T19:25:32Z We developed a simulation model for terrestrial sites including sensible heat exchange between the atmosphere and ground surface, inter- and intra-layer heat conduction by rock and soil, and shortwave and longwave radiation. Water fluxes included snowmelt, freezing/thawing of soil water, soil capillary flow, and vapour flows among atmosphere, soil, and snow. The model accounted for 96-99% of variation in soil temperature data. No long-term temporal trends in soil temperature were apparent. Soil water vapour concentration in thawed surface soil in summer often was higher than in frozen deeper soils, leading to downward vapour fluxes. Katabatic winds caused a reversal of the usual winter pattern of upward vapour fluxes. The model exhibited a steady state depth distribution of soil water due to vapour flows and in the absence of capillary flows below the top 0.5 cm soil layer. Beginning with a completely saturated soil profile, soil water was lost rapidly, and within a few hundred years approached a steady state characterized by dry soil (,0.5% gravimetric) down to one metre depth and saturated soil below that. In contrast, it took 42,000 years to approach steady state beginning from a completely dry initial condition. Text Antarc* Antarctica McMurdo Dry Valleys Portland State University: PDXScholar McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) |
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Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
McMurdo Dry Valleys (Antarctica) Antarctica -- Environmental conditions McMurdo Dry Valleys (Antarctica) -- Soil temperature -- Models Environmental Sciences Geology Glaciology |
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McMurdo Dry Valleys (Antarctica) Antarctica -- Environmental conditions McMurdo Dry Valleys (Antarctica) -- Soil temperature -- Models Environmental Sciences Geology Glaciology Hunt, H. W. Fountain, Andrew G. Doran, Peter T. Basagic, Hassan J. A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica |
topic_facet |
McMurdo Dry Valleys (Antarctica) Antarctica -- Environmental conditions McMurdo Dry Valleys (Antarctica) -- Soil temperature -- Models Environmental Sciences Geology Glaciology |
description |
We developed a simulation model for terrestrial sites including sensible heat exchange between the atmosphere and ground surface, inter- and intra-layer heat conduction by rock and soil, and shortwave and longwave radiation. Water fluxes included snowmelt, freezing/thawing of soil water, soil capillary flow, and vapour flows among atmosphere, soil, and snow. The model accounted for 96-99% of variation in soil temperature data. No long-term temporal trends in soil temperature were apparent. Soil water vapour concentration in thawed surface soil in summer often was higher than in frozen deeper soils, leading to downward vapour fluxes. Katabatic winds caused a reversal of the usual winter pattern of upward vapour fluxes. The model exhibited a steady state depth distribution of soil water due to vapour flows and in the absence of capillary flows below the top 0.5 cm soil layer. Beginning with a completely saturated soil profile, soil water was lost rapidly, and within a few hundred years approached a steady state characterized by dry soil (,0.5% gravimetric) down to one metre depth and saturated soil below that. In contrast, it took 42,000 years to approach steady state beginning from a completely dry initial condition. |
format |
Text |
author |
Hunt, H. W. Fountain, Andrew G. Doran, Peter T. Basagic, Hassan J. |
author_facet |
Hunt, H. W. Fountain, Andrew G. Doran, Peter T. Basagic, Hassan J. |
author_sort |
Hunt, H. W. |
title |
A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica |
title_short |
A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica |
title_full |
A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica |
title_fullStr |
A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica |
title_full_unstemmed |
A Dynamic Physical Model for Soil Temperature and Water in Taylor Valley, Antarctica |
title_sort |
dynamic physical model for soil temperature and water in taylor valley, antarctica |
publisher |
PDXScholar |
publishDate |
2010 |
url |
https://pdxscholar.library.pdx.edu/geog_fac/5 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1004&context=geog_fac |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
McMurdo Dry Valleys Taylor Valley |
geographic_facet |
McMurdo Dry Valleys Taylor Valley |
genre |
Antarc* Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys |
op_source |
Geography Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geog_fac/5 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1004&context=geog_fac |
_version_ |
1766267105485783040 |