气候变化领域集成服务门户(CCPortal): On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes

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DOI	10.1029/2020JD032465
	On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes
	Naud C.M.; Booth J.F.; Lamer K.; Marchand R.; Protat A.; McFarquhar G.M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:13
英文摘要	Focusing on conditions of subsidence when low clouds are present, ground-based observations in both the North Atlantic and the Southern Ocean reveal strong relationships between cloud boundary (base and top heights) and different measures of lower tropospheric instability. The difference in potential temperature between the surface and 800 hPa (a metric called M) provides a stronger relationship than measures of inversion strength such as the lower tropospheric stability and estimated inversion strength. This is because (1) inversion strength itself does not correlate well with cloud boundaries, and (2) M contains information that appears important for cloud boundaries. These include the surface forcing through the use of sea surface rather than near-surface air temperature and an upper level close to the real cloud top. These results expand upon previous work on the importance of M as a predictor of cloud morphology. However, important differences are found in low-cloud conditions for the North Atlantic as compared to the Southern Ocean (for a given value of M): stronger inversions, deeper boundary layers, and much larger sea level pressures. Therefore, the relationship between cloud boundaries and M differs between the two regions. A general circulation model provides similar relationships as observed between M and both cloud top height and temperature but tends to place clouds higher and at colder temperatures than observed for a given M. This might cause issues with the representation of precipitation, cloud cover and radiation in the Southern Ocean. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	boundary layer stability; CAM6; low-level clouds; MCAO M-index; southern ocean
语种	英语
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/185945
作者单位	Applied Physics and Applied Mathematics, Columbia University/NASA-GISS, New York, NY, United States; Earth and Atmospheric Sciences, CUNY-City College, New York, NY, United States; JISAO, University of Washington, Seattle, WA, United States; Australian Bureau of Meteorology, Melbourne, VIC, Australia; School of Meteorology and Cooperative Institute for Mesoscale Meteorology Studies (CIMMS), University of Oklahoma, Norman, OK, United States
推荐引用方式 GB/T 7714	Naud C.M.,Booth J.F.,Lamer K.,et al. On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes[J],2020,125(13).
APA	Naud C.M.,Booth J.F.,Lamer K.,Marchand R.,Protat A.,&McFarquhar G.M..(2020).On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes.Journal of Geophysical Research: Atmospheres,125(13).
MLA	Naud C.M.,et al."On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes".Journal of Geophysical Research: Atmospheres 125.13(2020).