Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr
Permafrost is an important climate factor of the cold-region environments, known to evolve over a long timescale. Although direct observations are required for the exact determination of presence, this is difficult especially in remote areas. An indirect assessment of permafrost zonation can help in...
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ftnipr:oai:nipr.repo.nii.ac.jp:00016911 2023-05-15T14:52:33+02:00 Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr 2022-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16911 http://id.nii.ac.jp/1291/00016780/ en eng https://doi.org/10.1016/j.polar.2021.100765 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16911 http://id.nii.ac.jp/1291/00016780/ Polar Science, 31, 100765(2022-03) 18739652 Permafrost zonation Circum-Arctic Glacial-interglacial timescale Statistical modeling Journal Article 2022 ftnipr https://doi.org/10.1016/j.polar.2021.100765 2022-12-03T19:43:26Z Permafrost is an important climate factor of the cold-region environments, known to evolve over a long timescale. Although direct observations are required for the exact determination of presence, this is difficult especially in remote areas. An indirect assessment of permafrost zonation can help in estimating the probable extents and providing an understanding of its spatiotemporal variability under different climate. In this paper, we adopt a previously defined indirect assessment method using freezing and thawing indices, which was revised and evaluated against new observation-based dataset. The revised method was applied to time-series of the circum-Arctic environment for the past 122 kyr constructed from a Greenland ice core, present-day reanalysis climatology, and a glacial isostatic adjustment model, and subsequently, examined in terms of the aggregation, persistence, and retreat of permafrost. Permafrost zones over exposed land varied between 9.11 million km2 (interglacial) and 26.7 million km2 (glacial); the maximum extent of subsea and subglacial permafrost was 7.7 million km2 and 0.5 million km2, respectively. The climatic sensitivity of its areal extent was examined for the meridional temperature gradient in the polar amplification (increase by 0.2 million km2 []−1 when warming occurs) and the global mean annual temperature (decrease by 4.3 million km2 −1). Article in Journal/Newspaper Arctic Greenland Greenland ice core Ice ice core permafrost Polar Science Polar Science National Institute of Polar Research Repository, Japan Arctic Greenland Polar Science 31 100765 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
Permafrost zonation Circum-Arctic Glacial-interglacial timescale Statistical modeling |
spellingShingle |
Permafrost zonation Circum-Arctic Glacial-interglacial timescale Statistical modeling Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr |
topic_facet |
Permafrost zonation Circum-Arctic Glacial-interglacial timescale Statistical modeling |
description |
Permafrost is an important climate factor of the cold-region environments, known to evolve over a long timescale. Although direct observations are required for the exact determination of presence, this is difficult especially in remote areas. An indirect assessment of permafrost zonation can help in estimating the probable extents and providing an understanding of its spatiotemporal variability under different climate. In this paper, we adopt a previously defined indirect assessment method using freezing and thawing indices, which was revised and evaluated against new observation-based dataset. The revised method was applied to time-series of the circum-Arctic environment for the past 122 kyr constructed from a Greenland ice core, present-day reanalysis climatology, and a glacial isostatic adjustment model, and subsequently, examined in terms of the aggregation, persistence, and retreat of permafrost. Permafrost zones over exposed land varied between 9.11 million km2 (interglacial) and 26.7 million km2 (glacial); the maximum extent of subsea and subglacial permafrost was 7.7 million km2 and 0.5 million km2, respectively. The climatic sensitivity of its areal extent was examined for the meridional temperature gradient in the polar amplification (increase by 0.2 million km2 []−1 when warming occurs) and the global mean annual temperature (decrease by 4.3 million km2 −1). |
format |
Article in Journal/Newspaper |
title |
Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr |
title_short |
Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr |
title_full |
Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr |
title_fullStr |
Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr |
title_full_unstemmed |
Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr |
title_sort |
climatic assessment of circum-arctic permafrost zonation over the last 122 kyr |
publishDate |
2022 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16911 http://id.nii.ac.jp/1291/00016780/ |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland ice core Ice ice core permafrost Polar Science Polar Science |
genre_facet |
Arctic Greenland Greenland ice core Ice ice core permafrost Polar Science Polar Science |
op_relation |
https://doi.org/10.1016/j.polar.2021.100765 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16911 http://id.nii.ac.jp/1291/00016780/ Polar Science, 31, 100765(2022-03) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2021.100765 |
container_title |
Polar Science |
container_volume |
31 |
container_start_page |
100765 |
_version_ |
1766323779289481216 |