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Comparison of aerosol optical depth of UV-B Monitoring and Research Program (UVMRP), AERONET and MODIS over continental United States |
Hongzhao TANG1( ), Maosi CHEN1, John DAVIS1, Wei GAO1,2 |
| 1. USDA UV-B Monitoring and Research Program, Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80521, USA; 2. Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO 80521, USA |
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Abstract The concern about the role of aerosols as to their effect in the Earth-Atmosphere system requires observation at multiple temporal and spatial scales. The Moderate Resolution Imaging Spectroradiameters (MODIS) is the main aerosol optical depth (AOD) monitoring satellite instrument, and its accuracy and uncertainty need to be validated against ground based measurements routinely. The comparison between two ground AOD measurement programs, the United States Department of Agriculture (USDA) Ultraviolet-B Monitoring and Research Program (UVMRP) and the Aerosol Robotic Network (AERONET) program, confirms the consistency between them. The intercomparison between the MODIS AOD, the AERONET AOD, and the UVMRP AOD suggests that the UVMRP AOD measurements are suited to be an alternative ground-based validation source for satellite AOD products. The experiments show that the spatial-temporal dependency between the MODIS AOD and the UVMRP AOD is positive in the sense that the MODIS AOD compare more favorably with the UVMRP AOD as the spatial and temporal intervals are increased. However, the analysis shows that the optimal spatial interval for all time windows is defined by an angular subtense of around 1° to 1.25°, while the optimal time window is around 423 to 483 minutes at most spatial intervals. The spatial-temporal approach around 1.25° & 423 minutes shows better agreement than the prevalent strategy of 0.25° & 60 minutes found in other similar investigations.
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| Keywords
aerosol optical depth (AOD)
United States Department of Agriculture (USDA) UV-B Monitoring and Research Program (UVMRP)
Aerosol Robotic Network (AERONET)
Moderate Resolution Imaging Spectroradiameters (MODIS)
validation
spatial-temporal approach
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Corresponding Author(s):
TANG Hongzhao,Email:hongzhao.tang@colostate.edu
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Issue Date: 05 June 2013
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