DOI: 10.1002/jgrd.50278
论文题名: A global survey of the effect of cloud contamination on the aerosol optical thickness and its long-term trend derived from operational AVHRR satellite observations
作者: Zhao T.X.-P. ; Chan P.K. ; Heidinger A.K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 2849
结束页码: 2857
语种: 英语
Scopus关键词: Advanced very high resolution radiometers (AVHRR)
; Contamination
; Reflection
; Aerosol optical thickness
; Aerosol remote sensing
; Aerosol retrieval algorithms
; Climate data records
; Cloud contamination
; Passive satellites
; Satellite observations
; Surface disturbances
; Aerosols
; aerosol property
; algorithm
; AVHRR
; calibration
; clear sky
; data set
; error analysis
; global ocean
; marine atmosphere
; NOAA satellite
; optical depth
; pixel
; radiometer
; satellite imagery
; trend analysis
英文摘要: Subpixel cloud contamination is one of the major issues plaguing passive satellite aerosol remote sensing. Its impact on the aerosol optical thickness (AOT) retrieval has been analyzed/evaluated by many studies. However, the question of how it influences the AOT trend remains to be answered. In this paper, four long-term advanced very high resolution radiometer (AVHRR) AOT data sets from 1981 to 2009 over global oceans for four different definitions of clear sky, respectively, are produced by applying a two-channel aerosol retrieval algorithm to the AVHRR clear-sky reflectances derived by combining NOAA Pathfinder Atmosphere's Extended AVHRR climate data record level-2b all-sky reflectances with the cloud probability parameter determined from the Bayesian probabilistic cloud detection technique. A global analysis of the effect of cloud contamination on the AVHRR AOT retrieval as well as on its long-term trend is then performed by comparing the results from the four data sets. It was found that cloud contamination imposes not only a positive bias on AOT values but also a positive bias on its long-term trend such that negative trends become less negative and positive trends become more positive. A cloud probability value of ≤1% has been identified as an optimal criterion for clear-sky definition to minimize the cloud contamination in the AVHRR aerosol retrieval while still retaining strong aerosol signals. In order for a satellite aerosol product to be useful and reliable in aerosol trend detection, the cloud contamination effect on aerosol trends needs to be studied/evaluated carefully along with the effects of calibration error, surface disturbance, and aerosol model assumptions. © 2013. 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/63822
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: National Climatic Data Center, NOAA/NESDIS, 151 Patton Ave., RM-445, Asheville, NC 28801, United States; Cooperative Institute for Climate and Satellites-North Carolina (CICS-NC), NOAA/NESDIS/NCDC, Asheville, NC, United States; Center for Satellite Applications and Research (STAR), NOAA/NESDIS, Madison, WI, United States
Recommended Citation:
Zhao T.X.-P.,Chan P.K.,Heidinger A.K.. A global survey of the effect of cloud contamination on the aerosol optical thickness and its long-term trend derived from operational AVHRR satellite observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)