Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada
Abstract Near‐surface rock temperatures were recorded hourly for more than one year around a sandstone tor located on a ridge‐crest at an elevation of 270 m asl. There were significant differences between air and rock temperatures except during the polar night. The SSE‐ and WSW‐facing sides experien...
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crwiley:10.1002/ppp.396 2024-06-02T08:06:03+00:00 Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada Lewkowicz, Antoni G. 2001 http://dx.doi.org/10.1002/ppp.396 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.396 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.396 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 12, issue 4, page 351-366 ISSN 1045-6740 1099-1530 journal-article 2001 crwiley https://doi.org/10.1002/ppp.396 2024-05-03T11:49:52Z Abstract Near‐surface rock temperatures were recorded hourly for more than one year around a sandstone tor located on a ridge‐crest at an elevation of 270 m asl. There were significant differences between air and rock temperatures except during the polar night. The SSE‐ and WSW‐facing sides experienced large amplitude diurnal temperature cycles in the late‐winter and spring, and these crossed through 0 °C from mid‐April to May, well before air temperatures rose above freezing. Rock temperatures at a depth of 15 mm on the SSE‐face exceeded air temperature by up to 31 °C. During most of the summer, rock faces and air temperatures remained above 0 °C. Diurnal temperature cycles were smaller in amplitude in the autumn and few cycles through 0 °C were measured because of persistent cloud cover and the absence of a radiation‐reflecting snowpack. Modelling using a constant environmental lapse rate shows that although the timing and number of temperature cycles through 0 °C are influenced by altitude, the importance of rock‐face orientation on the relative numbers of cycles is independent of tor elevation. The average rate of micro‐weathering measured on several tors over four years was 0.012 mm a −1 . No loss of larger clasts was observed at the monitored tor over 11 years suggesting that the combined rate of all types of weathering is low. Copyright © 2001 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ellesmere Island Nunavut Permafrost and Periglacial Processes polar night Wiley Online Library Canada Ellesmere Island Nunavut Permafrost and Periglacial Processes 12 4 351 366 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Near‐surface rock temperatures were recorded hourly for more than one year around a sandstone tor located on a ridge‐crest at an elevation of 270 m asl. There were significant differences between air and rock temperatures except during the polar night. The SSE‐ and WSW‐facing sides experienced large amplitude diurnal temperature cycles in the late‐winter and spring, and these crossed through 0 °C from mid‐April to May, well before air temperatures rose above freezing. Rock temperatures at a depth of 15 mm on the SSE‐face exceeded air temperature by up to 31 °C. During most of the summer, rock faces and air temperatures remained above 0 °C. Diurnal temperature cycles were smaller in amplitude in the autumn and few cycles through 0 °C were measured because of persistent cloud cover and the absence of a radiation‐reflecting snowpack. Modelling using a constant environmental lapse rate shows that although the timing and number of temperature cycles through 0 °C are influenced by altitude, the importance of rock‐face orientation on the relative numbers of cycles is independent of tor elevation. The average rate of micro‐weathering measured on several tors over four years was 0.012 mm a −1 . No loss of larger clasts was observed at the monitored tor over 11 years suggesting that the combined rate of all types of weathering is low. Copyright © 2001 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Lewkowicz, Antoni G. |
spellingShingle |
Lewkowicz, Antoni G. Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada |
author_facet |
Lewkowicz, Antoni G. |
author_sort |
Lewkowicz, Antoni G. |
title |
Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada |
title_short |
Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada |
title_full |
Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada |
title_fullStr |
Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada |
title_full_unstemmed |
Temperature regime of a small sandstone tor, latitude 80 °N, Ellesmere Island, Nunavut, Canada |
title_sort |
temperature regime of a small sandstone tor, latitude 80 °n, ellesmere island, nunavut, canada |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1002/ppp.396 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.396 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.396 |
geographic |
Canada Ellesmere Island Nunavut |
geographic_facet |
Canada Ellesmere Island Nunavut |
genre |
Ellesmere Island Nunavut Permafrost and Periglacial Processes polar night |
genre_facet |
Ellesmere Island Nunavut Permafrost and Periglacial Processes polar night |
op_source |
Permafrost and Periglacial Processes volume 12, issue 4, page 351-366 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.396 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
12 |
container_issue |
4 |
container_start_page |
351 |
op_container_end_page |
366 |
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1800750936821334016 |