Aerosol optical thickness and spatial variability along coastal and offshore waters of the eastern Arabian Sea
IR@NIO: CSIR-National Institute Of Oceanography, Goa
View Archive Info| Field | Value | |
| Creator |
Menon, H.B.
Sangekar, N. Lotliker, A. Moorthy, K.K. Vethamony, P. |
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| Date |
2011-03-09T10:56:01Z
2011-03-09T10:56:01Z 2011 |
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| Identifier |
ICES Journal of Marine Science, vol.68(4); 2011; 745-750
http://drs.nio.org/drs/handle/2264/3811 |
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| 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
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| Language |
en
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| Publisher |
Oxford
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| 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
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| Subject |
Remote Sensing
aerosol optical thickness ocean-colour monitor Arabian Sea |
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| Title |
Aerosol optical thickness and spatial variability along coastal and offshore waters of the eastern Arabian Sea
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| Type |
Journal Article
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