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- Title
Spatiotemporal Spectral Variations of AOT in India's EEZ over Arabian Sea: Validation of OCM-II.
- Authors
Simha, C. P.; Devara, P. C. S.; Saha, S. K.; Babu, K. N.; Shukla, A. K.
- Abstract
We report the results of sun-photometric measurements of Aerosol Optical Thickness (AOT) in India's Exclusive Economic Zone (EEZ) over the Arabian Sea along with synchronous Ocean Color Monitor (OCM-II) derived AOT estimates during December 12, 2009-January 10, 2010. Relatively higher values of Angstrom exponent (α) around 1.2 near coast and 0.2-0.8 in the India's EEZ, observed during the cruise period, indicate the presence of smaller particles near the coast due to anthropogenic activities; and larger particles in the India's EEZ due to advection of pollutants from Indian subcontinent via long-range transport. Results related to α and its derivative reveal four different aerosol types (urban-industrial, desert-dust, clean-marine, and mixed-type) with varying fraction during the study period. Surface radiative forcing due to aerosols is found to be 20 W/m2 over India's EEZ. OCMderived AOTs showed good corroboration with in situ measurements with a correlation coefficient of about 0.95. A reasonably good correlation was also observed between AOT and wind speed (R = 0.6); AOT and relative humidity (R = 0.58). The concurrent MODIS AOT data also agree well with those observed by the OCEANSAT (OCM-II) satellite during the campaign period.
- Subjects
INDIA; ARABIAN Sea; ECONOMIC zones (Law of the sea); SPATIOTEMPORAL processes; PHOTOMETRY; OCEAN color; ATMOSPHERIC aerosols; RADIATIVE forcing
- Publication
International Journal of Oceanography, 2012, p1
- ISSN
1687-9406
- Publication type
Article
- DOI
10.1155/2012/473162