气候变化领域集成服务门户(CCPortal): A Lagrangian analysis of pockets of open cells over the southeastern Pacific

CCPortal

DOI	10.5194/acp-22-8197-2022
	A Lagrangian analysis of pockets of open cells over the southeastern Pacific
	Smalley, Kevin M.; Lebsock, Matthew D.; Eastman, Ryan; Smalley, Mark; Witte, Mikael K.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8197
结束页码	8219
卷号	22 期号:12 页码:23
英文摘要	Pockets of open cells (POCs) have been shown to develop within closed-cell stratocumulus (StCu), and a large body of evidence suggests that the development of POCs result from changes in small-scale processes internal to the boundary layer rather than large-scale forcings. Precipitation is widely viewed as a key process important to POC development and maintenance. In this study, GOES-16 satellite observations are used in conjunction with MERRA-2 winds to track and compare the microphysical and environmental evolution of two populations of closed-cell StCu selected by visual inspection over the southeastern Pacific Ocean: one group that transitions to POCs and another comparison group (CLOSED) that does not. The high spatiotemporal resolution of the new GOES-16 data allows for a detailed examination of the temporal evolution of POCs in this region. We find that POCs tend to develop near the coast, last tens of hours, are larger than 10(4) km(2), and often (88% of cases) do not re-close before they exit the StCu deck. Most POCs are observed to form at night and tend to exit the StCu during the day when the StCu is contracting in area. Relative to the CLOSED trajectories, POCs have systematically larger effective radii, lower cloud drop number concentrations, a comparable conditional in-cloud liquid water path, and a higher frequency of more intense precipitation. Meanwhile, no systematic environmental differences other than boundary layer height are observed between POC and CLOSED trajectories. Interestingly, there are no differences in reanalysis aerosol optical depth between both sets of trajectories, which may lead one to the interpretation that differences in aerosol concentrations are not influencing POC development or resulting in a large number that re-close. However, this largely depends on the reanalysis treatment of aerosol-cloud interactions, and the product used in this study has no explicit handling of these important processes. These results support the consensus view regarding the importance of precipitation on the formation and maintenance of POCs and demonstrate the utility of modern geostationary remote sensing data in evaluating the POC life cycle.
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:000814708300001
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/273016
作者单位	California Institute of Technology; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); University of Washington; University of Washington Seattle; University of California System; University of California Los Angeles; United States Department of Defense; United States Navy; Naval Postgraduate School
推荐引用方式 GB/T 7714	Smalley, Kevin M.,Lebsock, Matthew D.,Eastman, Ryan,et al. A Lagrangian analysis of pockets of open cells over the southeastern Pacific[J],2022,22(12):23.
APA	Smalley, Kevin M.,Lebsock, Matthew D.,Eastman, Ryan,Smalley, Mark,&Witte, Mikael K..(2022).A Lagrangian analysis of pockets of open cells over the southeastern Pacific.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),23.
MLA	Smalley, Kevin M.,et al."A Lagrangian analysis of pockets of open cells over the southeastern Pacific".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):23.