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Boundary layer aerosol characteristics at Mahabubnagar during CAIPEEX-IGOC: Modeling the optical and radiative properties

Srivastava, AK and Bisht, DS and Tiwari, S (2013) Boundary layer aerosol characteristics at Mahabubnagar during CAIPEEX-IGOC: Modeling the optical and radiative properties. Science of the Total Environment, 468-46. pp. 1093-1102. ISSN 00489697

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An Integrated Ground Observational Campaign (IGOC) was conducted at Mahabubnagar - a tropical rural station in the southern peninsular India, under the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) program during the period from July to November 2011. Measured chemical composition and carbonaceous aerosols from PM2.5 samples were used in an aerosol optical model to deduce crucial aerosol optical properties, which were then used in a radiative transfer model for radiative forcing estimations. The model derived aerosol optical depth (AOD at 500nm), varied from 0.13 to 0.76 (mean of 0.40±0.18) whereas à ngström exponent (AE) between 0.10 and 0.65 (mean of 0.33±0.17) suggests relative dominance of coarse particles over the station. On the other hand, single scattering albedo (SSA at 500nm) was found to vary from 0.78 to 0.92 (mean of 0.87±0.04) during the measurement period. The magnitude of absorption à ngström exponent (AAE), varied from 0.83 to 1.33 (mean of 1.10±0.15), suggests mixed type aerosols over the station. Aerosol direct radiative forcing was estimated and found to vary from -8.9 to -49.3Wm-2 (mean of -27.4±11.8Wm-2) at the surface and +9.7 to +44.5Wm-2 (mean of +21.3±9.4Wm-2) in the atmosphere during the course of measurements. The atmospheric forcing was observed to be ~30 higher during October (+29±9Wm-2) as compared to August (+21±7Wm-2) when the station is mostly influenced by continental polluted aerosols. The result suggests an additional atmospheric heating rate of 0.24Kday-1 during October, which may be crucial for various boundary layer processes in favorable atmospheric conditions.

Item Type: Article
Additional Information: Copyrights of this article belongs to Elsevier.
Uncontrolled Keywords: Aerosol direct radiative forcing; Aerosol optical property; Atmospheric heating rate; CAIPEEX-IGOC; Precipitation enhancement; Radiative forcings; Radiative transfer model; Single scattering albedo
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 26 Jun 2014 10:23
Last Modified: 26 Jun 2014 10:23

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