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Aerosol optical thickness and spatial variability along coastal and offshore waters of the eastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Aerosol optical thickness and spatial variability along coastal and offshore waters of the eastern Arabian Sea
 
Creator Menon, H.B.
Sangekar, N.
Lotliker, A.
Moorthy, K.K.
Vethamony, P.
 
Subject Remote Sensing
aerosol optical thickness
ocean-colour monitor
Arabian Sea
 
Description Data from the ocean-colour monitor (OCM) on board the Indian Remote Sensing Satellite P4 were used to analyse the spatial and temporal distribution of aerosol optical thickness (AOT) over the coastal and offshore waters of the eastern Arabian Sea. Zero water-leaving radiance from the near infrared (NIR) region was assumed for oceanic (open ocean) waters, because of the absorption of longwave radiation by water molecules. As this assumption fails in coastal waters, it was necessary to correct for water-leaving radiance and sun glint to the NIR bands. The aerosol size distribution parameter (alpha) was derived from a relationship between two NIR bands. The Angstrom turbidity parameter (beta) was obtained using an algorithm relating in situ hand-held, sun-photometer measurements and aerosol radiance (L sub(a)) at 490 nm. The relationship between beta and L sub(a) (490) was derived with a sensitivity analysis, using a calibrated radiative transfer model. AOTs were retrieved for each pixel of 500 nm. The algorithm’s performance was tested by comparing OCM-derived AOT values with in situ AOT and MODIS-derived values. Aerosol maps thus generated from January to December 2005 demonstrate the potential of this new retrieval method for producing AOT climatology from OCM data over coastal waters
 
Date 2011-03-09T10:56:01Z
2011-03-09T10:56:01Z
2011
 
Type Journal Article
 
Identifier ICES Journal of Marine Science, vol.68(4); 2011; 745-750
http://drs.nio.org/drs/handle/2264/3811
 
Language en
 
Rights This is a pre-copy-editing, author-produced PDF of an article accepted for publication in [ICES Journal of Marine Science] following peer review. The definitive publisher-authenticated version [Citation above] is available online at: http://icesjms.oxfordjournals.org/content/68/4/745
 
Publisher Oxford