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Characterization of aerosols and pre-cursor gases over Maitri during 24th Indian Antarctica Expedition

Devara, PCS and Sonbawne, SM and Dani, KK and Saha, SK and Ernest Raj, P (2011) Characterization of aerosols and pre-cursor gases over Maitri during 24th Indian Antarctica Expedition. International Journal of Remote Sensing, 32 (20). pp. 5815-5826.

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Abstract

Within the framework of the 24th Indian Antarctica Expedition (IAE), observations of total column aerosol optical depth (AOD), ozone (TCO) and precipitable water content (TCW) using a multi-channel solar-radiometer (MICROTOPS-II: Microprocessor-controlled Total Ozone Portable Spectrometer-II), and observations of short-wave global radiative flux using a wide-band pyranometer have been carried out over the Indian Antarctica station Maitri (70.76° S, 11.74° E) and the southern Indian Ocean during December 2004-February 2005. These extensive datasets have been utilized to investigate the aerosol optical, physical and radiative properties, and their interface with simultaneously measured gases. Data over the Oceanic region have been collected from the ship front deck. The daily mean AOD at a characteristic wavelength of 500 nm was found to be 0.042 with an average Angstrom coefficient of 0.24, revealing an abundance of coarse-mode particles. Interestingly, the January fluxes were found to be less by about 20 compared with those in February. The average short-wave direct radiative forcing due to aerosols showed cooling at the surface with an average value of -0.47 Wm -2. The TCO increased from about 252 DU around 38° S to about 312 DU at 70° S, showing a gradual increase in ozone with increasing latitude. The TCO measured by the surface- based ozone monitor matched reasonably well with that observed by the Total Ozone Mapping Spectrometer (TOMS) satellite sensor within 5. Variability in ozone on a daily scale during the study period was less than 4 over the Antarctica region.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor and Francis.
Uncontrolled Keywords: Aerosol optical depths; Angstrom coefficient; Antarctica; Average values; Data sets; Direct radiative forcing; Multi-channel; Oceanic regions; Precipitable water content; Pyranometers; Radiative fluxes; Radiative properties; Satellite sensors; Short waves; Southern Indian ocean; Total ozone; Total ozone mapping spectrometer; Wide-band, Atmospheric radiation; Ozone; Spectrometers; Spectrometry, Atmospheric aerosols, aerosol; optical depth; ozone; precipitable water; radiometer; spectrometer; TOMS; water content, Antarctica
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 27 Jul 2014 09:39
Last Modified: 27 Jul 2014 09:39
URI: http://moeseprints.incois.gov.in/id/eprint/695

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