气候变化领域集成服务门户(CCPortal): Arctic Cloud Response to a Perturbation in Sea Ice Concentration: The North Water Polynya

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DOI	10.1029/2020JD034409
	Arctic Cloud Response to a Perturbation in Sea Ice Concentration: The North Water Polynya
	Monroe E.E.; Taylor P.C.; Boisvert L.N.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:16
英文摘要	Surface and atmosphere energy exchanges play an important role in the Arctic climate system by influencing the lower atmospheric stability and humidity, sea ice melt and growth, and surface temperature. Sea ice significantly alters the character of these energy exchanges relative to ice-free ocean. The observed decline in Arctic sea ice since 1979 motivates questions related to the evolving role of surface-atmosphere coupling and potential feedbacks on the Arctic system. Due to the strong wintertime cloud warming effect, a critical question concerns the potential response of low clouds to Arctic sea ice decline. Previous approaches relied on interannual variability to investigate the cloud response to sea ice decline. However, the covariation between atmospheric conditions and sea ice makes it difficult to define an observational control when using interannual variability. To circumvent this difficulty, we exploit the recurring North Water polynya, an episodic opening in the northern Baffin Bay sea ice, as a natural laboratory to isolate the cloud response to a rapid, near-step perturbation in sea ice. Our results show that during the event, (a) low-cloud cover is 10%–33% larger over the polynya than nearby sea ice, (b) cloud liquid water content is up to 400% larger over the polynya than nearby sea ice, and (c) the surface cloud radiative effect is 18 W m−2 larger over the polynya than nearby sea ice. Our results provide evidence that the low-cloud response during a polynya is a positive feedback lengthening the event. © 2021. Science Systems and Applications, Inc. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
英文关键词	Arctic clouds; cloud radiative effects; North Water; polynya; sea ice; surface turbulent flux
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237073
作者单位	Science Systems and Applications Inc., Hampton, VA, United States; NASA Langley Research Center, Hampton, VA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Monroe E.E.,Taylor P.C.,Boisvert L.N.. Arctic Cloud Response to a Perturbation in Sea Ice Concentration: The North Water Polynya[J],2021,126(16).
APA	Monroe E.E.,Taylor P.C.,&Boisvert L.N..(2021).Arctic Cloud Response to a Perturbation in Sea Ice Concentration: The North Water Polynya.Journal of Geophysical Research: Atmospheres,126(16).
MLA	Monroe E.E.,et al."Arctic Cloud Response to a Perturbation in Sea Ice Concentration: The North Water Polynya".Journal of Geophysical Research: Atmospheres 126.16(2021).