globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD026301
论文题名:
Validation of high-resolution MAIAC aerosol product over South America
作者: Martins V.S.; Lyapustin A.; de Carvalho L.A.S.; Barbosa C.C.F.; Novo E.M.L.M.
刊名: Journal of Geophysical Research: Atmospheres
出版年: 2017
卷: 122, 期:14
起始页码: 7537
结束页码: 7559
语种: 英语
英文关键词: AERONET ; aerosol optical depth (AOD) ; columnar water vapor (CWV) ; MODIS-MAIAC ; South America
英文摘要: Multiangle Implementation of Atmospheric Correction (MAIAC) is a new Moderate Resolution Imaging Spectroradiometer (MODIS) algorithm that combines time series approach and image processing to derive surface reflectance and atmosphere products, such as aerosol optical depth (AOD) and columnar water vapor (CWV). The quality assessment of MAIAC AOD at 1 km resolution is still lacking across South America. In the present study, critical assessment of MAIAC AOD550 was performed using ground-truth data from 19 Aerosol Robotic Network (AERONET) sites over South America. Additionally, we validated the MAIAC CWV retrievals using the same AERONET sites. In general, MAIAC AOD Terra/Aqua retrievals show high agreement with ground-based measurements, with a correlation coefficient (R) close to unity (RTerra:0.956 and RAqua: 0.949). MAIAC accuracy depends on the surface properties and comparisons revealed high confidence retrievals over cropland, forest, savanna, and grassland covers, where more than 2/3 (~66%) of retrievals are within the expected error (EE = ±(0.05 + 0.05 × AOD)) and R exceeding 0.86. However, AOD retrievals over bright surfaces show lower correlation than those over vegetated areas. Both MAIAC Terra and Aqua retrievals are similarly comparable to AERONET AOD over the MODIS lifetime (small bias offset ~0.006). Additionally, MAIAC CWV presents quantitative information with R ~ 0.97 and more than 70% of retrievals within error (±15%). Nonetheless, the time series validation shows an upward bias trend in CWV Terra retrievals and systematic negative bias for CWV Aqua. These results contribute to a comprehensive evaluation of MAIAC AOD retrievals as a new atmospheric product for future aerosol studies over South America. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: "We would like to acknowledge the NASA and MODIS team for the maintenance of satellite aerosol products. The work of V.S. Martins was funded by the Coordination for the Improvement of Higher Education Personnel (CAPES) Program. We thank Y. Wang for updating MAIAC data available at ftp://dataportal.nccs.nasa.gov/DataRelease/SouthAmerica/. We also thank AERONET PIs (B. Holben, P. Artaxo, E. Pereira, and E. Quel) for providing sun photometer data. Global Land cover product is available at http://landcover.usgs.gov/global_climatology.php and IBGE land cover at ftp://geoftp.ibge.gov.br/informacoes_ambientais/. We also thank Andrew Sayer and the anonymous reviewer for their helpful comments.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62627
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: Image Processing Division, Brazilian Institute for Space Research, São José dos Campos, Brazil; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Remote Sensing Division, Brazilian Institute for Space Research, São José dos Campos, Brazil

Recommended Citation:
Martins V.S.,Lyapustin A.,de Carvalho L.A.S.,et al. Validation of high-resolution MAIAC aerosol product over South America[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(14)
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