气候变化领域集成服务门户(CCPortal): Factors affecting precipitation formation and precipitation susceptibility of marine stratocumulus with variable above- and below-cloud aerosol concentrations over the Southeast Atlantic

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DOI	10.5194/acp-22-2769-2022
	Factors affecting precipitation formation and precipitation susceptibility of marine stratocumulus with variable above- and below-cloud aerosol concentrations over the Southeast Atlantic
	Gupta, Siddhant; McFarquhar, Greg M.; O'Brien, Joseph R.; Poellot, Michael R.; Delene, David J.; Miller, Rose M.; Griswold, Jennifer D. Small
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2769
结束页码	2793
卷号	22 期号:4 页码:25
英文摘要	Aerosol-cloud-precipitation interactions (ACIs) provide the greatest source of uncertainties in predicting changes in Earth's energy budget due to poor representation of marine stratocumulus and the associated ACIs in climate models. Using in situ data from 329 cloud profiles across 24 research flights from the NASA ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) field campaign in September 2016, August 2017, and October 2018, it is shown that contact between above-cloud biomass burning aerosols and marine stratocumulus over the Southeast Atlantic Ocean was associated with precipitation suppression and a decrease in the precipitation susceptibility (S-o) to aerosols. The 173 contact profiles with aerosol concentration (N-a) greater than 500 cm(-3) within 100 m above cloud tops had a 50 % lower precipitation rate (R-p) and a 20 % lower S-o, on average, compared to 156 separated profiles with N-a less than 500 cm(-3) up to at least 100 m above cloud tops. Contact and separated profiles had statistically significant differences in droplet concentration (N-e) and effective radius (R-e) (95 % confidence intervals from a two-sample t test are reported). Contact profiles had 84 to 90 cm(-3) higher N-c and 1.4 to 1.6 mu m lower R-e compared to separated profiles. In clean boundary layers (below-cloud N-a less than 350 cm(-3)), contact profiles had 25 to 31 cm(-3) higher N-c and 0.2 to 0.5 mu m lower R-e. In polluted boundary layers (below-cloud N-a exceeding 350 cm(-3)), contact profiles had 98 to 108 cm(-3) higher N-c and 1.6 to 1.8 mu m lower R-e . On the other hand, contact and separated profiles had statistically insignificant differences between the average liquid water path, cloud thickness, and meteorological parameters like surface temperature, lower tropospheric stability, and estimated inversion strength. These results suggest the changes in cloud microphysical properties were driven by ACIs rather than meteorological effects, and adjustments to existing relationships between R-p and N-c in model parameterizations should be considered to account for the role of ACIs.
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:000765810100001
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/273653
作者单位	University of Oklahoma System; University of Oklahoma - Norman; University of Oklahoma System; University of Oklahoma - Norman; University of North Dakota Grand Forks; University of Illinois System; University of Illinois Urbana-Champaign; University of Hawaii System; University of Hawaii Manoa
推荐引用方式 GB/T 7714	Gupta, Siddhant,McFarquhar, Greg M.,O'Brien, Joseph R.,et al. Factors affecting precipitation formation and precipitation susceptibility of marine stratocumulus with variable above- and below-cloud aerosol concentrations over the Southeast Atlantic[J],2022,22(4):25.
APA	Gupta, Siddhant.,McFarquhar, Greg M..,O'Brien, Joseph R..,Poellot, Michael R..,Delene, David J..,...&Griswold, Jennifer D. Small.(2022).Factors affecting precipitation formation and precipitation susceptibility of marine stratocumulus with variable above- and below-cloud aerosol concentrations over the Southeast Atlantic.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(4),25.
MLA	Gupta, Siddhant,et al."Factors affecting precipitation formation and precipitation susceptibility of marine stratocumulus with variable above- and below-cloud aerosol concentrations over the Southeast Atlantic".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.4(2022):25.