Retrieval of aerosol optical depth under thin cirrus from MODIS: Application to an ocean algorithm

被引:24
作者
Lee, Jaehwa [1 ,2 ]
Hsu, N. Christina [2 ]
Bettenhausen, Corey [2 ,3 ]
Sayer, Andrew M. [2 ,4 ]
机构
[1] Univ Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] Sci Syst & Applicat Inc, Lanham, MD USA
[4] Univ Space Res Assoc, Goddard Earth Sci Technol & Res, Columbia, MD USA
关键词
aerosol; AOD; cirrus; correction; MODIS; RADIATIVE-TRANSFER CODE; GROUND-BASED LIDAR; ATMOSPHERIC CORRECTION; VECTOR VERSION; SATELLITE DATA; CLOUDS; VALIDATION; AERONET; CALIPSO; RATIO;
D O I
10.1002/jgrd.50806
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
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 mu m, commonly used for AOD retrievals) by using the correlations between the top-of-atmosphere (TOA) reflectance at 1.38 mu m and these bands. The 1.38 mu m 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+0.05xAOD) 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.
引用
收藏
页码:10111 / 10124
页数:14
相关论文
共 44 条
[31]   The MODIS aerosol algorithm, products, and validation [J].
Remer, LA ;
Kaufman, YJ ;
Tanré, D ;
Mattoo, S ;
Chu, DA ;
Martins, JV ;
Li, RR ;
Ichoku, C ;
Levy, RC ;
Kleidman, RG ;
Eck, TF ;
Vermote, E ;
Holben, BN .
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2005, 62 (04) :947-973
[32]   Simultaneous determination of aerosol and thin cirrus optical depths over oceans from MODIS data: Some case studies [J].
Roskovensky, J. K. ;
Liou, K. N. .
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2006, 63 (09) :2307-2323
[33]   Simultaneous retrieval of aerosol and thin cirrus optical depths using MODIS airborne simulator data during CRYSTAL-FACE and CLAMS [J].
Roskovensky, JK ;
Liou, KN ;
Garrett, TJ ;
Baumgardner, D .
GEOPHYSICAL RESEARCH LETTERS, 2004, 31 (18) :L181101-4
[34]   Detection of thin cirrus from 1.38 μm/0.65 μm reflectance ratio combined with 8.6-11 μm brightness temperature difference -: art. no. 1985 [J].
Roskovensky, JK ;
Liou, KN .
GEOPHYSICAL RESEARCH LETTERS, 2003, 30 (19) :ASC4-1
[35]   Differentiating airborne dust from cirrus clouds using MODIS data [J].
Roskovensky, JK ;
Liou, KN .
GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (12) :1-5
[36]   Global distribution of cirrus clouds from CloudSat/Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) measurements [J].
Sassen, Kenneth ;
Wang, Zhien ;
Liu, Dong .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2008, 113 (D20)
[37]   A pure marine aerosol model, for use in remote sensing applications [J].
Sayer, A. M. ;
Smirnov, A. ;
Hsu, N. C. ;
Holben, B. N. .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2012, 117
[38]   Comparison of CALIPSO aerosol optical depth retrievals to AERONET measurements, and a climatology for the lidar ratio of dust [J].
Schuster, G. L. ;
Vaughan, M. ;
MacDonnell, D. ;
Su, W. ;
Winker, D. ;
Dubovik, O. ;
Lapyonok, T. ;
Trepte, C. .
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2012, 12 (16) :7431-7452
[39]   Cloud-screening and quality control algorithms for the AERONET database [J].
Smirnov, A ;
Holben, BN ;
Eck, TF ;
Dubovik, O ;
Slutsker, I .
REMOTE SENSING OF ENVIRONMENT, 2000, 73 (03) :337-349
[40]  
Solomon S, 2007, AR4 CLIMATE CHANGE 2007: THE PHYSICAL SCIENCE BASIS, P1