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Aerosol characteristics during the coolest june month over new delhi, northern india

Kumar, A and Tiwari, S and Bisht, DS and Devara, PCS and Goloub, P and Li, Z and Srivastava, MK (2011) Aerosol characteristics during the coolest june month over new delhi, northern india. International Journal of Remote Sensing, 32 (23). pp. 8463-8483.

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Abstract

June 2008, which is also the transition month between two major seasons for Indo-Gangetic Basin (IGB), has been identified the coolest June over New Delhi during the past century, showing mean temperature of 31.6 ± 1.7°C, which was found to be ~2°C less than its climatological mean (33.9°C). Aerosol optical properties for this month and thus obtained physical parameters have been studied using data from the CIMEL sun/sky radiometer, installed in New Delhi under the Aerosol Robotic Network (AERONET) programme. Results reveal bimodal aerosol volume size distribution. The monthly mean values for aerosol optical depth (AOD) at 500 nm (0.96 ± 0.31) and à ngström exponent at the wavelength pair of 440-870 nm (0.79 ± 0.42) show significant lower values whereas single scattering albedo at 675 nm shows a significantly larger value (0.94 ± 0.04) compared with previous measurements over the station. Results suggest dominance of scattering- type particles such as water-soluble aerosols from anthropogenic sources and dust aerosols from natural sources with higher relative humidity over the station. Radiative forcing caused due to the aerosols for the month of June 2008, which have been computed using the radiative-transfer model, informs low forcing at the top of atmosphere (TOA, +14 W -m) as well as at surface (-33 W m-2). The resultant atmospheric forcing (+47 W m-2) indicates warming effect that caused heating of lower atmosphere at the rate of 0.89 K day-1.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor and Francis.
Uncontrolled Keywords: Aerosol characteristics; Aerosol optical depths; Aerosol optical property; Aerosol robotic networks; Anthropogenic sources; Atmospheric forcing; Bimodal aerosol; Dust aerosols; Higher relative humidity; Indo-Gangetic basin; Lower atmosphere; Mean temperature; Mean values; Natural sources; Physical parameters; Radiative forcings; Radiative transfer model; Single scattering albedo; Top of atmospheres; Wavelength pair, Atmospheric humidity; Atmospheric radiation; Optical properties, Atmospheric aerosols, aerosol property; albedo; anthropogenic source; atmospheric forcing; dust; heating; optical depth; particle size; radiative forcing; radiative transfer; radiometer; size distribution, Delhi; India; New Delhi
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/692

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