DOI: 10.1002/jgrd.50806
论文题名: Retrieval of aerosol optical depth under thin cirrus from MODIS: Application to an ocean algorithm
作者: Lee J. ; Hsu N.C. ; Bettenhausen C. ; Sayer A.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 10111
结束页码: 10124
语种: 英语
英文关键词: aerosol
; AOD
; cirrus
; correction
; MODIS
Scopus关键词: Aerosols
; Algorithms
; Atmospheric aerosols
; Electric power factor correction
; Optical correlation
; Optical radar
; Radiometers
; Reflection
; Satellite imagery
; Aerosol retrieval algorithms
; Aerosol robotic networks
; AOD
; cirrus
; Cloud-aerosol lidar with orthogonal polarizations
; Moderate resolution imaging spectroradiometer
; MODIS
; Statistical comparisons
; Clouds
; aerosol
; algorithm
; atmospheric correction
; cirrus
; error analysis
; marine environment
; MODIS
; optical depth
; reflectance
; spatial variation
; water vapor
英文摘要: A strategy for retrieving aerosol optical depth (AOD) under conditions of thin cirrus coverage from the Moderate Resolution Imaging Spectroradiometer (MODIS) is presented. We adopt an empirical method that derives the cirrus contribution to measured reflectance in seven bands from the visible to shortwave infrared (0.47, 0.55, 0.65, 0.86, 1.24, 1.63, and 2.12 μm, commonly used for AOD retrievals) by using the correlations between the top-of-atmosphere (TOA) reflectance at 1.38 μm and these bands. The 1.38 μm band is used due to its strong absorption by water vapor and allows us to extract the contribution of cirrus clouds to TOA reflectance and create cirrus-corrected TOA reflectances in the seven bands of interest. These cirrus-corrected TOA reflectances are then used in the aerosol retrieval algorithm to determine cirrus-corrected AOD. The cirrus correction algorithm reduces the cirrus contamination in the AOD data as shown by a decrease in both magnitude and spatial variability of AOD over areas contaminated by thin cirrus. Comparisons of retrieved AOD against Aerosol Robotic Network observations at Nauru in the equatorial Pacific reveal that the cirrus correction procedure improves the data quality: the percentage of data within the expected error ±(0.03 + 0.05 × AOD) increases from 40% to 80% for cirrus-corrected points only and from 80% to 86% for all points (i.e., both corrected and uncorrected retrievals). Statistical comparisons with Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) retrievals are also carried out. A high correlation (R = 0.89) between the CALIOP cirrus optical depth and AOD correction magnitude suggests potential applicability of the cirrus correction procedure to other MODIS-like sensors. Key Points AOD retrieval under thin cirrus from MODIS is presentedThe cirrus-corrected AOD is compared with AERONET and CALIOP observationsThe cirrus correction procedure improves the data quality ©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/63328
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: Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; NASA Goddard Space Flight Center, Code 613, Greenbelt, MD 20771, United States; Science Systems and Applications, Inc., Lanham, MD, United States; Goddard Earth Science Technology and Research, Universities Space Research Association, Columbia, MD, United States
Recommended Citation:
Lee J.,Hsu N.C.,Bettenhausen C.,et al. Retrieval of aerosol optical depth under thin cirrus from MODIS: Application to an ocean algorithm[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)