气候变化领域集成服务门户(CCPortal): Daytime aerosol optical depth above low-level clouds is similar to that in adjacent clear skies at the same heights: Airborne observation above the southeast Atlantic

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DOI	10.5194/acp-20-11275-2020
	Daytime aerosol optical depth above low-level clouds is similar to that in adjacent clear skies at the same heights: Airborne observation above the southeast Atlantic
	Shinozuka Y.; Kacenelenbogen M.S.; Burton S.P.; Howell S.G.; Zuidema P.; Ferrare R.A.; Leblanc S.E.; Pistone K.; Broccardo S.; Redemann J.; Sebastian Schmidt K.; Cochrane S.P.; Fenn M.; Freitag S.; Dobracki A.; Segal-Rosenheimer M.; Flynn C.J.
发表日期	2020
ISSN	16807316
起始页码	11275
结束页码	11285
卷号	20 期号:19
英文摘要	To help satellite retrieval of aerosols and studies of their radiative effects, we demonstrate that daytime aerosol optical depth over low-level clouds is similar to that in neighboring clear skies at the same heights. Based on recent airborne lidar and sun photometer observations above the southeast Atlantic, the mean aerosol optical depth (AOD) difference at 532 nm is between 0 and-0:01, when comparing the cloudy and clear sides, each up to 20 km wide, of cloud edges. The difference is not statistically significant according to a paired t test. Systematic differences in the wavelength dependence of AOD and in situ single scattering albedo are also minuscule. These results hold regardless of the vertical distance between cloud top and aerosol layer bottom. AOD aggregated over ~ 2? grid boxes for each of September 2016, August 2017 and October 2018 also shows little correlation with the presence of low-level clouds. We posit that a satellite retrieval artifact is entirely responsible for a previous finding of generally smaller AOD over clouds (Chung et al., 2016), at least for the region and time of our study. Our results also suggest that the same values can be assumed for the intensive properties of free-tropospheric biomass-burning aerosol regardless of whether clouds are present below. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; albedo; biomass burning; cloud radiative forcing; concentration (composition); optical depth; satellite imagery; troposphere; Atlantic Ocean; Atlantic Ocean (Southeast)
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/143920
作者单位	Universities Space Research Association, Columbia, MD, United States; Nasa Ames Research Center, Moffett Field, CA, United States; Nasa Langley Research Center, Hampton, VA, United States; Department of Oceanography, University of Hawai'i at Ma noa, Honolulu, HI, United States; Department of Atmospheric Sciences, University of Miami, Miami, FL, United States; Bay Area Environmental Research Institute, Moffett Field, CA, United States; School of Meteorology, University of Oklahoma, Norman, OK, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; Laboratory for Atmospheric and Space Physics, Boulder, CO, United States; Science Systems and Applications Inc, Hampton, VA, United States; Department of Geophysics, Porter School of the Environment and Earth Sciences, Tel Aviv University, Tel Aviv, Israel
推荐引用方式 GB/T 7714	Shinozuka Y.,Kacenelenbogen M.S.,Burton S.P.,et al. Daytime aerosol optical depth above low-level clouds is similar to that in adjacent clear skies at the same heights: Airborne observation above the southeast Atlantic[J],2020,20(19).
APA	Shinozuka Y..,Kacenelenbogen M.S..,Burton S.P..,Howell S.G..,Zuidema P..,...&Flynn C.J..(2020).Daytime aerosol optical depth above low-level clouds is similar to that in adjacent clear skies at the same heights: Airborne observation above the southeast Atlantic.Atmospheric Chemistry and Physics,20(19).
MLA	Shinozuka Y.,et al."Daytime aerosol optical depth above low-level clouds is similar to that in adjacent clear skies at the same heights: Airborne observation above the southeast Atlantic".Atmospheric Chemistry and Physics 20.19(2020).