Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica
Abstract Instead of starting with an initially dry, below sea-level basin undergoing glacierization, as was done in an earlier. model, the present computations are based on the existence of an open channel connecting the Ross and Bellingshausen Seas. The period of glacierization begins as the sea in...
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Cambridge University Press (CUP)
1961
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Online Access: | http://dx.doi.org/10.1017/s0022143000017482 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000017482 |
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crcambridgeupr:10.1017/s0022143000017482 2024-03-03T08:38:55+00:00 Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica Wexler, H. 1961 http://dx.doi.org/10.1017/s0022143000017482 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000017482 en eng Cambridge University Press (CUP) Journal of Glaciology volume 3, issue 30, page 1075-1087 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1961 crcambridgeupr https://doi.org/10.1017/s0022143000017482 2024-02-08T08:39:08Z Abstract Instead of starting with an initially dry, below sea-level basin undergoing glacierization, as was done in an earlier. model, the present computations are based on the existence of an open channel connecting the Ross and Bellingshausen Seas. The period of glacierization begins as the sea in the channel freezes permanently and acquires accumulation, both from local precipitation and transport from the adjacent mountains. Times of growth of the ice shelf, by combined freezing from below and accumulation of 10 and 20 cm. yr. −1 , respectively, are determined for the case of a linear temperature profile in the ice. After the ice shelf becomes grounded further growth is by accumulation only. Steady-state temperature profiles for ice sheets 2,300 and 4,300 m. thick are computed under assumption of constant geothermal heat flux of 10 −6 cal. cm. −1 sec. −1 and compared with observed temperatures in the 300 m. drill hole at Byrd Station. Basal melting of the 4,300 m. thick ice is found to exist only for the smaller accumulation rate. The effect of down-slope motion and sinking of ice strata on the vertical temperature profile of the surface layer is studied with aid of the Benfield-Radok formula. Assuming no climatic temperature change and an initial temperature gradient at the ice crest of 1° C. increase per 100 m. increase in depth, the curve of best fit of all those tried is for a sinking rate of 20 cm. yr. −1 and a down-slope speed of 85 m. yr. −1 (2,130 yr. of motion from the crest). Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Journal of Glaciology Cambridge University Press Byrd Byrd Station ENVELOPE(-119.533,-119.533,-80.017,-80.017) Journal of Glaciology 3 30 1075 1087 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Wexler, H. Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract Instead of starting with an initially dry, below sea-level basin undergoing glacierization, as was done in an earlier. model, the present computations are based on the existence of an open channel connecting the Ross and Bellingshausen Seas. The period of glacierization begins as the sea in the channel freezes permanently and acquires accumulation, both from local precipitation and transport from the adjacent mountains. Times of growth of the ice shelf, by combined freezing from below and accumulation of 10 and 20 cm. yr. −1 , respectively, are determined for the case of a linear temperature profile in the ice. After the ice shelf becomes grounded further growth is by accumulation only. Steady-state temperature profiles for ice sheets 2,300 and 4,300 m. thick are computed under assumption of constant geothermal heat flux of 10 −6 cal. cm. −1 sec. −1 and compared with observed temperatures in the 300 m. drill hole at Byrd Station. Basal melting of the 4,300 m. thick ice is found to exist only for the smaller accumulation rate. The effect of down-slope motion and sinking of ice strata on the vertical temperature profile of the surface layer is studied with aid of the Benfield-Radok formula. Assuming no climatic temperature change and an initial temperature gradient at the ice crest of 1° C. increase per 100 m. increase in depth, the curve of best fit of all those tried is for a sinking rate of 20 cm. yr. −1 and a down-slope speed of 85 m. yr. −1 (2,130 yr. of motion from the crest). |
format |
Article in Journal/Newspaper |
author |
Wexler, H. |
author_facet |
Wexler, H. |
author_sort |
Wexler, H. |
title |
Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica |
title_short |
Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica |
title_full |
Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica |
title_fullStr |
Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica |
title_full_unstemmed |
Growth and Thermal Structure of the Deep Ice in Byrd Land, Antarctica |
title_sort |
growth and thermal structure of the deep ice in byrd land, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1961 |
url |
http://dx.doi.org/10.1017/s0022143000017482 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000017482 |
long_lat |
ENVELOPE(-119.533,-119.533,-80.017,-80.017) |
geographic |
Byrd Byrd Station |
geographic_facet |
Byrd Byrd Station |
genre |
Antarc* Antarctica Ice Shelf Journal of Glaciology |
genre_facet |
Antarc* Antarctica Ice Shelf Journal of Glaciology |
op_source |
Journal of Glaciology volume 3, issue 30, page 1075-1087 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000017482 |
container_title |
Journal of Glaciology |
container_volume |
3 |
container_issue |
30 |
container_start_page |
1075 |
op_container_end_page |
1087 |
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1792507410395430912 |