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Multi-site characterization of tropical aerosols: Implications for regional radiative forcing

Sumit, K and Devara, PCS and Manoj, MG (2012) Multi-site characterization of tropical aerosols: Implications for regional radiative forcing. Atmospheric Research, 106. pp. 71-85.

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Abstract

A land campaign, as a part of the Indian Space Research Organization-Geosphere Biosphere Program (ISRO-GBP), has been organized using a suit of instruments like AERONET (Aerosol Robotic Network) Sun/Sky sunphotometer, Microtops-II (MICROprocessor-controlled Total Ozone Portable Spectrometer), short-wave pyranometer from December 1, 2006 to April 30, 2007, over five locations (Ahmedabad, Pune, Sinhgad, Trivandrum and Gadanki) representing different environments. The dominance of different aerosol types such as biomass burning, urban/industrial pollution, marine origin and desert-dust particles is expected at these five sites. In all locations, significant day-to-day variability in AOD and à ngström exponent is observed. The à ngström exponent exhibits its lowest values over semi-arid region (Ahmedabad) 0.4-0.7, while it is around 1.8 at rural site (Gadanki). The retrieved volume size distributions for Pune, Ahmedabad and Trivandrum are found to be bimodal with varying concentration of each mode. Interesting feature of this observation is, very low coarse-mode volume concentration observed at Trivandrum even though observations were made about 300m from the coast. The synergy of results from these complementary measurements is reflected in the computed regional aerosol radiative forcing and heating rates. We have used a radiative transfer model (SBDART) to examine the variations of aerosol direct radiative effect (ADRE) and heating rates to give an overall estimation of the effect on climate. The ADRE, over different measurement sites, at short wavelength is found to be negative at the surface in the range of -18 to -59Wm -2, and TOA forcing values varied from +0.9 to -8Wm -2.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: AOD; Coastal; High altitude; SSA; Urban, Arid regions; Atmospheric aerosols; Atmospheric radiation; Climate models; Heating rate; Marine pollution; Ozone; Radiative transfer; Space research, Air pollution, aerosol; biomass burning; climate forcing; coastal zone; concentration (composition); diurnal variation; heating; radiative forcing; radiative transfer; size distribution; tropical meteorology; urban pollution, Ahmedabad; Gadanki; Gujarat; India; Maharashtra; Pune; Tamil Nadu
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 21 Dec 2013 06:29
Last Modified: 21 Dec 2013 06:29
URI: http://moeseprints.incois.gov.in/id/eprint/523

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