Validation of space-born Moderate Resolution Imaging Spectroradiometer remote sensors aerosol products using application of ground-based Multi-wavelength Radiometer |
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Authors: | Raj Paul Guleria Jagdish Chandra Kuniyal Pitamber Prasad Dhyani |
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Institution: | 1. G.B. Pant Institute of Himalayan Environment and Development, Himachal Unit, Mohal-Kullu 175126, India;2. G.B. Pant Institute of Himalayan Environment and Development, Kosi-Katarmal, Almora 263643, India |
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Abstract: | The measurements of aerosol optical properties were carried out during April 2006 to March 2011 over Mohal (31.9°N, 77.12°E) in the northwestern Indian Himalaya, using the application of ground-based Multi-wavelength Radiometer (MWR) and space-born Moderate Resolution Imaging Spectroradiometer (MODIS) remote sensors. The average (±standard deviation) values of aerosol optical depth (AOD) at 500 nm, Ångström exponent and turbidity coefficient during the entire measurement period were 0.25 ± 0.09, 1.15 ± 0.42 and 0.12 ± 0.06 respectively. About 86% AOD values retrieved from MODIS remote sensor were found within an uncertainty limit (Δτpλ = ±0.05 ± 0.15τpλ). In general, the MWR derived AOD values were higher than that of MODIS retrieval with absolute difference ∼0.02. During the entire period of measurement space-born MODIS remote sensor and ground-based MWR observation showed good correspondence with significant correlation coefficient ∼0.78 and root mean square difference ∼0.06. For daily observations the relative difference between these two estimates stood less than 9%. However, satellite-based and ground-based observation showed good correspondence, but further efforts still needed to eliminate systematic errors in the existing MODIS algorithm. |
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Keywords: | Aerosol optical depth Å ngströ m parameters MODIS Single scattering albedo |
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