Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica
Abstract Temperature, inclination, and closure have been measured in a 309 m. deep drill hole at Byrd Station, Antarctica. The results of five series of measurements taken yearly since February 1958 show that temperatures below 70 m. have remained constant since December 1958, that the closure rate...
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Cambridge University Press (CUP)
1963
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Online Access: | http://dx.doi.org/10.1017/s0022143000028355 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000028355 |
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crcambridgeupr:10.1017/s0022143000028355 2024-03-03T08:38:46+00:00 Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica Gow, Anthony J. 1963 http://dx.doi.org/10.1017/s0022143000028355 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000028355 en eng Cambridge University Press (CUP) Journal of Glaciology volume 4, issue 36, page 771-784 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1963 crcambridgeupr https://doi.org/10.1017/s0022143000028355 2024-02-08T08:39:08Z Abstract Temperature, inclination, and closure have been measured in a 309 m. deep drill hole at Byrd Station, Antarctica. The results of five series of measurements taken yearly since February 1958 show that temperatures below 70 m. have remained constant since December 1958, that the closure rate has accelerated, and that the hole has undergone negligible inclination from the vertical. Anomalous temperatures in the upper levels of the drill hole are attributed to the steel casing that was permanently emplaced to a depth of 36 m. during drilling in 1957–58. A positive temperature gradient was observed in the casing, but negative gradients exist below the casing and a constant gradient profile is developed below 170 m. Both ice motion and climatic changes at Byrd Station are thought to have contributed to the formation of the observed negative temperature gradients. Insignificant bending of the drill hole would imply negligible differential motion in the upper 300 m. of the 2,400 m. thick ice sheet at Byrd Station. The rate of hole closure has accelerated throughout the 4 yr. period of observations, except at the bottom of the drill hole, where the most recent measurements (February 1962) show that some constraint is now developing. Deformation rates throughout the drill hole are not proportional to some constant power of the stress; instead the value of the power has been found to increase with both increasing stress and time of application of stress. This behavior is attributed to some process of continuous deformational recrystallization of ice in the walls of the drill hole. A recoring of the deformed drill hole to investigate such effects is advocated. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Journal of Glaciology Cambridge University Press Byrd Byrd Station ENVELOPE(-119.533,-119.533,-80.017,-80.017) Journal of Glaciology 4 36 771 784 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Gow, Anthony J. Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract Temperature, inclination, and closure have been measured in a 309 m. deep drill hole at Byrd Station, Antarctica. The results of five series of measurements taken yearly since February 1958 show that temperatures below 70 m. have remained constant since December 1958, that the closure rate has accelerated, and that the hole has undergone negligible inclination from the vertical. Anomalous temperatures in the upper levels of the drill hole are attributed to the steel casing that was permanently emplaced to a depth of 36 m. during drilling in 1957–58. A positive temperature gradient was observed in the casing, but negative gradients exist below the casing and a constant gradient profile is developed below 170 m. Both ice motion and climatic changes at Byrd Station are thought to have contributed to the formation of the observed negative temperature gradients. Insignificant bending of the drill hole would imply negligible differential motion in the upper 300 m. of the 2,400 m. thick ice sheet at Byrd Station. The rate of hole closure has accelerated throughout the 4 yr. period of observations, except at the bottom of the drill hole, where the most recent measurements (February 1962) show that some constraint is now developing. Deformation rates throughout the drill hole are not proportional to some constant power of the stress; instead the value of the power has been found to increase with both increasing stress and time of application of stress. This behavior is attributed to some process of continuous deformational recrystallization of ice in the walls of the drill hole. A recoring of the deformed drill hole to investigate such effects is advocated. |
format |
Article in Journal/Newspaper |
author |
Gow, Anthony J. |
author_facet |
Gow, Anthony J. |
author_sort |
Gow, Anthony J. |
title |
Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica |
title_short |
Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica |
title_full |
Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica |
title_fullStr |
Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica |
title_full_unstemmed |
Results of Measurements in the 309 Meter Bore Hole at Byrd Station, Antarctica |
title_sort |
results of measurements in the 309 meter bore hole at byrd station, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1963 |
url |
http://dx.doi.org/10.1017/s0022143000028355 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000028355 |
long_lat |
ENVELOPE(-119.533,-119.533,-80.017,-80.017) |
geographic |
Byrd Byrd Station |
geographic_facet |
Byrd Byrd Station |
genre |
Antarc* Antarctica Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctica Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 4, issue 36, page 771-784 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000028355 |
container_title |
Journal of Glaciology |
container_volume |
4 |
container_issue |
36 |
container_start_page |
771 |
op_container_end_page |
784 |
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1792507219567181824 |