Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania
Tropical mountain permafrost has a unique thermal regime due to ground surface exposure to strong solar radiation. The intensity of the surface offset resulting from snow cover also strongly affects the absence or presence of permafrost. Latent heat transfer and reflected solar radiation (higher alb...
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Online Access: | https://doi.org/10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 |
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ftdoajarticles:oai:doaj.org/article:6195250ff7f44c3ab571bfddb32c3c07 2023-05-15T14:14:34+02:00 Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania Kenji Yoshikawa Douglas R. Hardy Kenji Narita William R. Bolton Julia Stanilovskaya Elena B. Sparrow 2021-01-01T00:00:00Z https://doi.org/10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 EN eng Taylor & Francis Group http://dx.doi.org/10.1080/15230430.2021.1903375 https://doaj.org/toc/1523-0430 https://doaj.org/toc/1938-4246 1523-0430 1938-4246 doi:10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 Arctic, Antarctic, and Alpine Research, Vol 53, Iss 1, Pp 127-145 (2021) tropical permafrost kilimanjaro high mountain permafrost permafrost Environmental sciences GE1-350 Ecology QH540-549.5 article 2021 ftdoajarticles https://doi.org/10.1080/15230430.2021.1903375 2022-12-31T14:50:01Z Tropical mountain permafrost has a unique thermal regime due to ground surface exposure to strong solar radiation. The intensity of the surface offset resulting from snow cover also strongly affects the absence or presence of permafrost. Latent heat transfer and reflected solar radiation (higher albedo) that occur during the snow-covered season contribute to a positive feedback that cools the ground. Eleven ground temperature monitoring sites were established on the mountain at 2,780 to 5,820 m.a.s.l. The geothermal heat flow is locally high in the caldera of this volcano, as shown by borehole temperature data. Permafrost is located near the only glacier entirely within the caldera (Furtwängler). These three-year continuous records of ground temperature data encompass years of high and low snow cover. Our results show that the current lower boundary of permafrost is slightly above summit altitude and relict permafrost is present due to the influence of saturated sand on latent heat transfer. Permafrost tends to be lost more rapidly during drought years. The remaining permafrost seems likely to disappear in the future. The presence of permafrost and its thermal resistance depends on the ice content of caldera sand and the duration of snow cover. Article in Journal/Newspaper Antarctic and Alpine Research Arctic Ice permafrost Directory of Open Access Journals: DOAJ Articles Arctic, Antarctic, and Alpine Research 53 1 127 145 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
tropical permafrost kilimanjaro high mountain permafrost permafrost Environmental sciences GE1-350 Ecology QH540-549.5 |
spellingShingle |
tropical permafrost kilimanjaro high mountain permafrost permafrost Environmental sciences GE1-350 Ecology QH540-549.5 Kenji Yoshikawa Douglas R. Hardy Kenji Narita William R. Bolton Julia Stanilovskaya Elena B. Sparrow Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania |
topic_facet |
tropical permafrost kilimanjaro high mountain permafrost permafrost Environmental sciences GE1-350 Ecology QH540-549.5 |
description |
Tropical mountain permafrost has a unique thermal regime due to ground surface exposure to strong solar radiation. The intensity of the surface offset resulting from snow cover also strongly affects the absence or presence of permafrost. Latent heat transfer and reflected solar radiation (higher albedo) that occur during the snow-covered season contribute to a positive feedback that cools the ground. Eleven ground temperature monitoring sites were established on the mountain at 2,780 to 5,820 m.a.s.l. The geothermal heat flow is locally high in the caldera of this volcano, as shown by borehole temperature data. Permafrost is located near the only glacier entirely within the caldera (Furtwängler). These three-year continuous records of ground temperature data encompass years of high and low snow cover. Our results show that the current lower boundary of permafrost is slightly above summit altitude and relict permafrost is present due to the influence of saturated sand on latent heat transfer. Permafrost tends to be lost more rapidly during drought years. The remaining permafrost seems likely to disappear in the future. The presence of permafrost and its thermal resistance depends on the ice content of caldera sand and the duration of snow cover. |
format |
Article in Journal/Newspaper |
author |
Kenji Yoshikawa Douglas R. Hardy Kenji Narita William R. Bolton Julia Stanilovskaya Elena B. Sparrow |
author_facet |
Kenji Yoshikawa Douglas R. Hardy Kenji Narita William R. Bolton Julia Stanilovskaya Elena B. Sparrow |
author_sort |
Kenji Yoshikawa |
title |
Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania |
title_short |
Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania |
title_full |
Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania |
title_fullStr |
Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania |
title_full_unstemmed |
Ground thermal regimes and implications for permafrost distribution on Kilimanjaro, Tanzania |
title_sort |
ground thermal regimes and implications for permafrost distribution on kilimanjaro, tanzania |
publisher |
Taylor & Francis Group |
publishDate |
2021 |
url |
https://doi.org/10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 |
genre |
Antarctic and Alpine Research Arctic Ice permafrost |
genre_facet |
Antarctic and Alpine Research Arctic Ice permafrost |
op_source |
Arctic, Antarctic, and Alpine Research, Vol 53, Iss 1, Pp 127-145 (2021) |
op_relation |
http://dx.doi.org/10.1080/15230430.2021.1903375 https://doaj.org/toc/1523-0430 https://doaj.org/toc/1938-4246 1523-0430 1938-4246 doi:10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 |
op_doi |
https://doi.org/10.1080/15230430.2021.1903375 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
53 |
container_issue |
1 |
container_start_page |
127 |
op_container_end_page |
145 |
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1766286961865129984 |