Publications

Prijith, SS; Athul, AK; Babu, SS (2024). Aerosol Optical Depth Over Ocean From Ocean Color Monitor-3 Onboard the Earth Observation Satellite (EOS-06). IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, 21, 1004105.

Abstract
The Continuance of satellite-based retrievals with series of space-borne sensors is essential to generate long term climate quality data records. Indian Space Research Organisation (ISRO) launched Ocean Color Monitor-3 (OCM-3), onboard the Earth Observation Satellite-06 (EOS-06), which is the third one in the series of OCM sensors. EOS-06/OCM-3 has potential for the retrieval of AOD at 555 nm (tau (555) ) over oceanic regions at pixel level resolution of 366 m at nadir. Here, an algorithm for AOD retrieval based on look-up table (LUT) approach, employing radiative transfer computations to account for multiple scattering in the atmosphere, is presented. LUTs of top of the atmosphere (TOA) reflectance are generated with region and season specific aerosol models, based on the measurements of aerosol properties over the oceanic regions around India in pre-monsoon and winter seasons. Theoretically expected uncertainty in tau (555) from OCM-3 (tau (OCM3) ) is estimated to be epsilon (tau) = 0.1 x tau + 0.2, (correlation coefficient, R = 0.95). Validation of tau (OCM3) with AERONET AOD shows a linear regression slope (m) 0.79, intercept (c) 0.02 and R 0.85. tau (OCM3) is in good agreement with MODIS AOD with m, c and R values 0.996, 0.06 and 0.78, respectively and thereby ensures continuity of climate quality AOD data for longer period. Retrieval of AOD from OCM-3 at a finer spatial resolution would significantly improve regional characterization of aerosol properties and assessment of aerosol climate impacts.

DOI:
10.1109/LGRS.2024.3476435

ISSN:
1558-0571