| DOI: | 10.1002/2016GL068506
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| 论文题名: | Threshold sensitivity of shallow Arctic lakes and sublake permafrost to changing winter climate |
| 作者: | Arp C.D.; Jones B.M.; Grosse G.; Bondurant A.C.; Romanovsky V.E.; Hinkel K.M.; Parsekian A.D.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9682
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| EISSN: | 1944-9413
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| 出版年: | 2016
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| 卷: | 43, 期:12 | | 起始页码: | 6358
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| 结束页码: | 6365
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| 语种: | 英语
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| 英文关键词: | climate change
; lake ice
; permafrost
; taliks
; thermokarst lakes
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| Scopus关键词: | Freezing
; Ice
; Lakes
; Permafrost
; Thawing
; Empirical model
; High temperature sensitivity
; Northern Alaska
; Permafrost thaws
; Taliks
; Thermokarst lakes
; Threshold sensitivity
; Water sediment interface
; Climate change
; climate change
; ice lake
; ice thickness
; permafrost
; sediment-water interface
; sensitivity analysis
; shallow water
; talik
; thermokarst
; threshold
; water temperature
; winter
; Alaska
; Arctic
; United States
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| 英文摘要: | Interactions and feedbacks between abundant surface waters and permafrost fundamentally shape lowland Arctic landscapes. Sublake permafrost is maintained when the maximum ice thickness (MIT) exceeds lake depth and mean annual bed temperatures (MABTs) remain below freezing. However, declining MIT since the 1970s is likely causing talik development below shallow lakes. Here we show high-temperature sensitivity to winter ice growth at the water-sediment interface of shallow lakes based on year-round lake sensor data. Empirical model experiments suggest that shallow (1 m depth) lakes have warmed substantially over the last 30 years (2.4°C), with MABT above freezing 5 of the last 7 years. This is in comparison to slower rates of warming in deeper (3 m) lakes (0.9°C), with already well-developed taliks. Our findings indicate that permafrost below shallow lakes has already begun crossing a critical thawing threshold approximately 70 years prior to predicted terrestrial permafrost thaw in northern Alaska. ©2016. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977557139&doi=10.1002%2f2016GL068506&partnerID=40&md5=6d30c55da6d7d1cc3742e7c1e1216832
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/10645
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States
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| Recommended Citation: | |
Arp C.D.,Jones B.M.,Grosse G.,et al. Threshold sensitivity of shallow Arctic lakes and sublake permafrost to changing winter climate[J]. Geophysical Research Letters,2016-01-01,43(12).
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