DOI: 10.1002/2017JD027926
Scopus记录号: 2-s2.0-85044506426
论文题名: Coupled Retrieval of Liquid Water Cloud and Above-Cloud Aerosol Properties Using the Airborne Multiangle SpectroPolarimetric Imager (AirMSPI)
作者: Xu F. ; van Harten G. ; Diner D.J. ; Davis A.B. ; Seidel F.C. ; Rheingans B. ; Tosca M. ; Alexandrov M.D. ; Cairns B. ; Ferrare R.A. ; Burton S.P. ; Fenn M.A. ; Hostetler C.A. ; Wood R. ; Redemann J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 6 起始页码: 3175
结束页码: 3204
语种: 英语
英文关键词: aerosols above cloud
; airborne remote sensing
; marine stratocumulus clouds
; polarimetry
; vector radiative transfer
Scopus关键词: aerosol
; airborne sensing
; cloud droplet
; footprint
; optical depth
; optimization
; polarization
; radiative transfer
; remote sensing
; satellite imagery
; size distribution
; stratocumulus
英文摘要: An optimization algorithm is developed to retrieve liquid water cloud properties including cloud optical depth (COD), droplet size distribution and cloud top height (CTH), and above-cloud aerosol properties including aerosol optical depth (AOD), single-scattering albedo, and microphysical properties from sweep-mode observations by Jet Propulsion Laboratory's Airborne Multiangle SpectroPolarimetric Imager (AirMSPI) instrument. The retrieval is composed of three major steps: (1) initial estimate of the mean droplet size distribution across the entire image of 80–100 km along track by 10–25 km across track from polarimetric cloudbow observations, (2) coupled retrieval of image-scale cloud and above-cloud aerosol properties by fitting the polarimetric data at all observation angles, and (3) iterative retrieval of 1-D radiative transfer-based COD and droplet size distribution at pixel scale (25 m) by establishing relationships between COD and droplet size and fitting the total radiance measurements. Our retrieval is tested using 134 AirMSPI data sets acquired during the National Aeronautics and Space Administration (NASA) field campaign ObseRvations of Aerosols above CLouds and their intEractionS. The retrieved above-cloud AOD and CTH are compared to coincident HSRL-2 (HSRL-2, NASA Langley Research Center) data, and COD and droplet size distribution parameters (effective radius reff and effective variance veff) are compared to coincident Research Scanning Polarimeter (RSP) (NASA Goddard Institute for Space Studies) data. Mean absolute differences between AirMSPI and HSRL-2 retrievals of above-cloud AOD at 532 nm and CTH are 0.03 and <0.5 km, respectively. At RSP's footprint scale (~ 323 m), mean absolute differences between RSP and AirMSPI retrievals of COD, reff, and veff in the cloudbow area are 2.33, 0.69 μm, and 0.020, respectively. Neglect of smoke aerosols above cloud leads to an underestimate of image-averaged COD by ~15%. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114244
Appears in Collections: 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Liberal Arts, School of the Art Institute of Chicago, Chicago, IL, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; NASA Langley Research Center, Hampton, VA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; NASA Ames Research Center, Moffett Field, CA, United States
Recommended Citation:
Xu F.,van Harten G.,Diner D.J.,et al. Coupled Retrieval of Liquid Water Cloud and Above-Cloud Aerosol Properties Using the Airborne Multiangle SpectroPolarimetric Imager (AirMSPI)[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(6)