DOI: 10.1002/jgrd.50330
论文题名: CALIOP and AERONET aerosol optical depth comparisons: One size fits none
作者: Omar A.H. ; Winker D.M. ; Tackett J.L. ; Giles D.M. ; Kar J. ; Liu Z. ; Vaughan M.A. ; Powell K.A. ; Trepte C.R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4748
结束页码: 4766
语种: 英语
英文关键词: AERONET
; Aerosol Optical Depth
; CALIPSO
Scopus关键词: Atmospheric aerosols
; Instrument errors
; Overpasses
; AERONET
; Aerosol optical depths
; Aerosol robotic networks
; CALIPSO
; Cloud contamination
; Cloud-aerosol lidar with orthogonal polarizations
; Geographic conditions
; Satellite observations
; Optical radar
; aerosol
; backscatter
; CALIPSO
; cloud
; cloud cover
; inhomogeneity
; lidar
; optical depth
; satellite data
英文摘要: We compare the aerosol optical depths (AOD) retrieved from backscatter measurements of the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) satellite with coincident Aerosol Robotic Network (AERONET) measurements. Overpass coincidence criteria of ±2 h and within a 40 km radius are satisfied at least once at 149 globally distributed AERONET sites from 2006 to 2010. Most data pairs (>80%) use AERONET measurements acquired ±30 min of the overpass. We examine the differences in AOD estimates between CALIOP and AERONET for various aerosol, environmental, and geographic conditions. Results show CALIOP AOD are lower than AERONET AOD especially at low optical depths as measured by AERONET (500 nm AOD < 0.1). Furthermore, the median relative AOD difference between the two measurements is 25% of the AERONET AOD for AOD > 0.1. Differences in AOD between CALIOP and AERONET are possibly due to cloud contamination, scene inhomogeneity, instrument view angle differences, CALIOP retrieval errors, and detection limits. Comparison of daytime to nighttime number of 5 km × 60 m (60 m in the vertical) features detected by CALIOP show that there are 20% more aerosol features at night. We find that CALIPSO and AERONET do not agree on the cloudiness of scenes. Of the scenes that meet the above coincidence criteria, CALIPSO finds clouds in more than 45% of the coincident atmospheric columns AERONET classifies as clear. Key PointsCriteria for AOD ComparisonsStudy provides guidance for CALIPSO data screening ©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/63763
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: NASA Langley Research Center, Science Directorate, MailStop 475, Hampton, VA 23681, United States; Science Systems and Applications Inc. (SSAI), Hampton VA, United States; NASA Goddard Space Flight Center, Greenbelt MD, United States; Sigma Space Corporation, Greenbelt MD, United States; National Institute of Aerospace, Hampton VA, United States
Recommended Citation:
Omar A.H.,Winker D.M.,Tackett J.L.,et al. CALIOP and AERONET aerosol optical depth comparisons: One size fits none[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)