气候变化领域集成服务门户(CCPortal): Stability-dependent increases in liquid water with droplet number in the Arctic

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DOI	10.5194/acp-22-5743-2022
	Stability-dependent increases in liquid water with droplet number in the Arctic
	Murray-Watson, Rebecca J.; Gryspeerdt, Edward
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	5743
结束页码	5756
卷号	22 期号:9 页码:14
英文摘要	The effects of aerosols on cloud microphysical properties are a large source of uncertainty when assessing anthropogenic climate change. The aerosol-cloud relationship is particularly unclear in high-latitude polar regions due to a limited number of observations. Cloud liquid water path (LWP) is an important control on cloud radiative properties, particularly in the Arctic, where clouds play a central role in the surface energy budget. Therefore, understanding how aerosols may alter cloud LWP is important, especially as aerosol sources such as industry and shipping move further north in a warming Arctic. Using satellite data, this work investigates the effects of aerosols on liquid Arctic clouds over open ocean by considering the relationship between cloud droplet number concentration (N-d) and LWP, an important component of the aerosol-LWP relationship. The LWP response to N-d varies significantly across the region, with increases in LWP with N-d observed at very high latitudes in multiple satellite datasets, with this positive signal observed most strongly during the summer months. This result is in contrast to the negative response typically seen in global satellite studies and previous work on Arctic clouds showing little LWP response to aerosols. The lower tropospheric stability (LTS) was found to be an important control on the spatial variations in LWP response, strongly influencing the sign and magnitude of the N-d-LWP relationship, with increases in LWP in high-stability environments. The influence of humidity varied depending on the stability, with little impact at low LTS but a strong influence at high LTS. The mean Nd state does not dominate the LWP response, despite the nonlinearities in the relationship. As the N-d-LWP sensitivity changed from positive to negative when moving from high- to low-LTS environments, this work shows evidence of a temperature-dependent aerosol indirect effect. Additionally, the LWP-LTS relationship changes with Nd, generating an aerosol-dependent cloud feedback. As the LTS is projected to decrease and the boundary layer to become more polluted in a future Arctic, these results show that aerosol increases may produce lower cloud water paths. This shift to more unstable environments implies that LWP adjustments shift from enhancing the Twomey effect by 8 % to offsetting it by around 40 %, with this warming effect having potential consequences for sea ice extent.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000789846500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273858
作者单位	Imperial College London
推荐引用方式 GB/T 7714	Murray-Watson, Rebecca J.,Gryspeerdt, Edward. Stability-dependent increases in liquid water with droplet number in the Arctic[J],2022,22(9):14.
APA	Murray-Watson, Rebecca J.,&Gryspeerdt, Edward.(2022).Stability-dependent increases in liquid water with droplet number in the Arctic.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(9),14.
MLA	Murray-Watson, Rebecca J.,et al."Stability-dependent increases in liquid water with droplet number in the Arctic".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.9(2022):14.