In-cloud and below-cloud scavenging of aerosol ionic species over a tropical rural atmosphere in India

Chatterjee, Abhijit ; Jayaraman, Achutan ; Rao, Narayana T. ; Raha, Sibaji (2010) In-cloud and below-cloud scavenging of aerosol ionic species over a tropical rural atmosphere in India Journal of Atmospheric Chemistry, 66 (1-2). pp. 27-40. ISSN 0167-7764

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Official URL: http://link.springer.com/article/10.1007%2Fs10874-...

Related URL: http://dx.doi.org/10.1007/s10874-011-9190-5

Abstract

The temporal variation in concentrations of major water soluble ionic species has been studied from several rain events occurred over Gadanki (13.5 °N, 79.2 °E), located in tropical semi arid region in southern India. The contribution from rain-out (in cloud) and wash-out (below cloud) processes to the total removal of ionic species by rain events is also estimated using the pattern of variations of ionic species within an individual event. A number of rain samples were collected from each rain event during June–November in 2006, 2007 and 2008. On average, nearly 20% of the total NH+4 and non-sea SO42− is removed by in-cloud scavenging, suggesting that their removal by “below cloud” washout is relatively dominant. In contrast Na+, Ca2+, Mg2+, NO3 and sea-SO42− are mainly removed by below-cloud scavenging or wash-out process. A significant variation in the acidity was observed within rain events with successive precipitation showing higher acidity at the final stage of the precipitation due to partial neutralization of non-sea SO42− . Overall, greater influence of both terrestrial and anthropogenic sources is recorded in the rain events compared to that from marine sources.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
Keywords:In-cloud and Below-Cloud Scavenging; Wet Deposition; Aerosol Ionic Species; Rainwater Acidity
ID Code:95746
Deposited On:26 Nov 2012 10:05
Last Modified:26 Nov 2012 10:05

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