Name
Title | ||
|---|---|---|
Retrieval of Aerosol Optical Thickness Using MODIS , a Study in Hong Kong and the Pearl River Delta Region |
Abstract | ||
|---|---|---|
Aerosol detection and monitoring by satellite observations has been substantially developed over the past decades. While several state-of-the-art aerosol retrieval techniques provide aerosol properties at global scale, high spatial detail that is suitable for urbanized regions is unavailable because most of the satellite-based products are at coarse resolution. A refined aerosol retrieval algorithm using the MODerate Resolution Imaging Spectroradiometer (MODIS) to retrieve aerosol properties at 500-m resolution over land is described here. The rationale of our technique is to first estimate the aerosol reflectances by decomposing the top-of-atmosphere reflectance from surface reflectance and Rayleigh path reflectance. For the determination of surface reflectances, a modified minimum reflectance technique (MRT) is used, and MRT images are computed for different seasons. A good agreement is obtained between the surface reflectances of MRT images and MODIS land surface reflectance products (MOD09), with a correlation of 0.9. For conversion of aerosol reflectance to aerosol optical thickness (AOT), comprehensive lookup tables are constructed which consider aerosol properties and sun-viewing geometry in the radiative transfer calculations. The resulting 500-m AOT images are highly correlated (r = 0.937) with AErosol RObotic NETwork sunphotometer observations in Hong Kong for most of the year corresponding to the long dry season. This study demonstrates a method for aerosol retrieval at fine resolution over urbanized regions, which can assist the study of aerosol spatial distribution. In addition, the MODIS 500-m AOT images can also be used to pinpoint source areas of cross-boundary aerosols from the Pearl River Delta region. |
Year | DOI | Venue |
|---|---|---|
2010 | 10.1109/TGRS.2010.2045124 | Geoscience and Remote Sensing, IEEE Transactions |
Keywords | Field | DocType |
aerosols,air pollution,atmospheric composition,atmospheric optics,atmospheric techniques,radiative transfer,AErosol RObotic NETwork sunphotometer observations,Hong Kong,MODIS land surface reflectance products,MODerate Resolution Imaging Spectroradiometer,MRT images,Pearl River Delta region,Rayleigh path reflectance,aerosol detection,aerosol monitoring,aerosol optical thickness,aerosol properties,aerosol reflectance,aerosol reflectances,aerosol retrieval algorithm,aerosol retrieval techniques,aerosol spatial distribution,air pollution,coarse resolution,cross-boundary aerosols,modified minimum reflectance technique,radiative transfer,remote sensing,source areas,sun-viewing geometry,surface reflectance,top-of-atmosphere reflectance,urbanized regions,Aerosols,air pollution,remote sensing | AERONET,Atmospheric optics,Optical depth,Moderate-resolution imaging spectroradiometer,Satellite,Remote sensing,Aerosol,Radiative transfer,Image resolution,Mathematics | Journal |
Volume | Issue | ISSN |
48 | 8 | 0196-2892 |
Citations | PageRank | References |
2 | 0.61 | 4 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Man Sing Wong | 1 | 20 | 11.83 |
| Kwon Ho Lee | 2 | 5 | 2.71 |
| Janet E. Nichol | 3 | 29 | 4.46 |
| Zhanqing Li | 4 | 35 | 13.98 |