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First Results from Light Scattering Enhancement Factor over Central Indian Himalayas during GVAX Campaign

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dc.contributor.author Dumka, U. C
dc.contributor.author Kaskaoutis, D. G
dc.contributor.author Sagar, R
dc.contributor.author Chen, J
dc.contributor.author Singh, N
dc.contributor.author Tiwari, S
dc.date.accessioned 2020-11-27T12:54:57Z
dc.date.available 2020-11-27T12:54:57Z
dc.date.issued 2017-02
dc.identifier.citation Science of The Total Environment, Vol. 605-606, pp. 124-138 en_US
dc.identifier.issn 0048-9697
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7506
dc.description Restricted Access © Elsevier B.V https://doi.org/10.1016/j.scitotenv.2017.06.138 en_US
dc.description.abstract The present work examines the influence of relative humidity (RH), physical and optical aerosol properties on the light-scattering enhancement factor [f(RH=85%)] over central Indian Himalayas during the Ganges Valley Aerosol Experiment (GVAX). The aerosol hygroscopic properties were measured by means of DoE/ARM (US Department of Energy, Atmospheric Radiation Measurement) mobile facility focusing on periods with the regular instrumental operation (November – December 2011). The measured optical properties include aerosol light-scattering (sp) and absorption (ap) coefficients and the intensive parameters i.e., single scattering albedo (SSA), scattering Ångström exponent (SAE), absorption Ångström exponent (AAE) and light scattering enhancement factor (f(RH) = sp(RH,)/sp(RHdry, )). The measurements were separated for sub-micron (<1 µm, D1µm) and particles with diameter <10 µm (D10µm) in order to examine the influence of particle size on f(RH) and enhancement rate (γ). The particle size affects the aerosol hygroscopicity since mean f(RH = 85%) of 1.27 ± 0.12 and 1.32 ± 0.14 are found for D10µm and D1µm, respectively. These f(RH) values are relatively low suggesting the enhanced presence of soot and carbonaceous particles from biomass burning activities, which is verified via backward air-mass trajectories. Similarly, the light-scattering enhancement rates are ~0.20 and 0.17 for the D1µm and D10µm particles, respectively. However, a general tendency for increasing f(RH) and γ is shown for higher sp and ap values indicating the presence of rather aged smoke plumes, coated with industrial aerosols over northern India, with mean SSA, SAE and AAE values of 0.92, 1.00 and 1.15 respectively. On the other hand, a moderate-to-small dependence of f(RH) and γ on SAE, AAE, and SSA was observed for both particle sizes. Furthermore, f(RH) exhibits an increasing tendency with the number of cloud condensation nuclei (NCCN) indicating larger particle hygroscopicity but without significant dependence on the activation ratio. en_US
dc.language.iso en en_US
dc.publisher Elsevier B.V en_US
dc.subject Aerosol hygroscopicity en_US
dc.subject Scattering enhancement en_US
dc.subject f(RH = 85%) en_US
dc.subject Relative humidity en_US
dc.subject CCN en_US
dc.subject GVAX en_US
dc.subject Himalaya en_US
dc.title First Results from Light Scattering Enhancement Factor over Central Indian Himalayas during GVAX Campaign en_US
dc.type Article en_US

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