气候变化领域集成服务门户(CCPortal): Effective sea ice area based on a thickness threshold

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DOI	10.1007/s00382-021-05655-6
	Effective sea ice area based on a thickness threshold
	Ford V.L.; Frauenfeld O.W.; Nowotarski C.J.; Bombardi R.J.
发表日期	2021
ISSN	0930-7575
起始页码	899
结束页码	916
卷号	56 期号:2021-11-12
英文摘要	As Arctic sea ice declines in response to climate change, a shift from thick multiyear ice to a thinner ice cover is occurring. With this transition, ice thicknesses approach a threshold below which ice no longer insulates the atmosphere from oceanic surface fluxes. While this is well known, there are no estimates of the magnitude of this threshold, nor of the proportion of sea ice area that is below this threshold as ice thins. We determine this threshold by simulating the atmospheric response to varying thicknesses, ranging from 0.0 to 2.0 m and determine that threshold to be 0.40–0.50 m. The resulting “effective” ice area is 4–14% lower than reported total ice area, as 0.39–0.97 × 106 km2 of the total ice area falls below the threshold throughout the twentieth century, including during notable ice minima. The atmosphere above large non-insulating ice-covered regions is susceptible to more than 2 °C of warming despite ice presence. Observed mean Arctic Ocean ice thickness is projected to fall below this threshold as early as the mid-2020s. Studies on ocean–atmosphere interactions in relation to sea ice area should focus on this insulating sea ice area, where ice is at least 0.40–0.50 m thick, and treat ice regions below 0.40–0.50 m thickness with caution. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	Arctic sea ice; Insulating ice area; Sea ice thickness threshold
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183275
作者单位	Climate Science Lab, Department of Geography, Texas A&M University, College Station, United States; Department of Atmospheric Sciences, Texas A&M University, College Station, United States
推荐引用方式 GB/T 7714	Ford V.L.,Frauenfeld O.W.,Nowotarski C.J.,et al. Effective sea ice area based on a thickness threshold[J],2021,56(2021-11-12).
APA	Ford V.L.,Frauenfeld O.W.,Nowotarski C.J.,&Bombardi R.J..(2021).Effective sea ice area based on a thickness threshold.Climate Dynamics,56(2021-11-12).
MLA	Ford V.L.,et al."Effective sea ice area based on a thickness threshold".Climate Dynamics 56.2021-11-12(2021).