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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Published in:Arctic, Antarctic, and Alpine Research
Main Authors: Kenji Yoshikawa, Douglas R. Hardy, Kenji Narita, William R. Bolton, Julia Stanilovskaya, Elena B. Sparrow
Format: Article in Journal/Newspaper
Language:English
Published: Taylor & Francis Group 2021
Subjects:
geo
Ice
Online Access:https://doi.org/10.1080/15230430.2021.1903375
https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07
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spelling fttriple:oai:gotriple.eu:oai:doaj.org/article:6195250ff7f44c3ab571bfddb32c3c07 2023-05-15T14:14:21+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 2021-01-01 https://doi.org/10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 en eng Taylor & Francis Group 1523-0430 1938-4246 doi:10.1080/15230430.2021.1903375 https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07 undefined Arctic, Antarctic, and Alpine Research, Vol 53, Iss 1, Pp 127-145 (2021) tropical permafrost kilimanjaro high mountain permafrost permafrost geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.1080/15230430.2021.1903375 2023-01-22T19:13:45Z 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 Unknown Arctic, Antarctic, and Alpine Research 53 1 127 145
institution Open Polar
collection Unknown
op_collection_id fttriple
language English
topic tropical permafrost
kilimanjaro
high mountain permafrost
permafrost
geo
envir
spellingShingle tropical permafrost
kilimanjaro
high mountain permafrost
permafrost
geo
envir
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
geo
envir
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 1523-0430
1938-4246
doi:10.1080/15230430.2021.1903375
https://doaj.org/article/6195250ff7f44c3ab571bfddb32c3c07
op_rights undefined
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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