Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr
Climatic assessment of circum-Arctic permafrost zonation over the last 122 kyr
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过去122 kyr环北极永久冻土带的气候评估
DOI:
10.1016/j.polar.2021.100765
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发表时间:
2022
期刊:
影响因子:
1.8
通讯作者:
Yokohata Tokuta
中科院分区:
文献类型:
--
作者:
Saito Kazuyuki;Okuno Jun'ichi;Machiya Hirokazu;Iwahana Go;Ohno Hiroshi;Yokohata Tokuta
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 km 2 (interglacial) and 26.7 million km 2 (glacial); the maximum extent of subsea and subglacial permafrost was 7.7 million km 2 and 0.5 million km 2, respectively. The climatic sensitivity of its areal extent was examined for the meridional temperature gradient in the polar amplification (increase by 0.2 million km 2 [° C/10°]− 1 when warming occurs) and the global mean annual temperature (decrease by 4.3 million km 2° C− 1).
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影响因子:
2.2
作者:
Yeyi Liu;D. Jiang
通讯作者:
D. Jiang
DOI:
--
发表时间:
2004
期刊:
数学 56・3
影响因子:
--
作者:
T.Takenouchi;S.Eguchi;渕野昌
通讯作者:
渕野昌
影响因子:
30.7
作者:
Chadburn, S. E.;Burke, E. J.;Westermann, S.
通讯作者:
Westermann, S.
影响因子:
5
作者:
Lindgren, Amelie;Hugelius, Gustaf;Vandenberghe, Jef
通讯作者:
Vandenberghe, Jef
DOI:
--
发表时间:
1982
期刊:
--
影响因子:
--
作者:
S. Harris
通讯作者:
S. Harris