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Chemistry of rainwater and aerosols over Bay of Bengal during CTCZ program

Budhavant, KB and Rao, PSP and Safai, PD and Gawhane, RD and Raju, MP (2010) Chemistry of rainwater and aerosols over Bay of Bengal during CTCZ program. Journal of Atmospheric Chemistry, 65 (2-3). pp. 171-183.

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Abstract

For the first time, simultaneous study on physical and chemical characteristics of PM 10, PM 2.5, and rainwater chemistry was attempted over the Bay of Bengal in monsoon season of 2009. The aerosols and rainwater samples were collected onboard ship 'SK-261, ORV Sagar Kanya' during Oceanographic Observations in the Northern Bay of Bengal under the Continental Tropical Convergence Zone (CTCZ) program conducted during 16 July to 19 Aug 2009. Aerosol samples collected by PM 10 and PM 2.5 were analyzed for various water soluble (Na +, K +, Ca 2+, Mg 2+, NH 4 + , Cl -, SO 4 2- and NO 3 - and acid soluble (Fe 2+, Al 3+, Zn 2+, Mn 3+ and Ni 2+) ionic constituents. The pH of rainwater varied from 5.10 to 7.04. Chloride ions contributed most to the total ion concentration in aerosol and rainwater, followed by Na +. Significant contributions of SO 4 2- , NO 3 - and NH 4 + found in PM 2.5, PM 10 and high concentrations of TSP and non sea-salt SO 4 2- over the mid-ocean is attributed to the long range transport of anthropogenic pollution from the Indian continent. The scavenging ratio was maximum for coarse particles such as Ca 2+ and minimum for fine particles like NH 4 +.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer
Uncontrolled Keywords: aluminum; ammonia; calcium ion; chloride ion; iron; magnesium ion; manganese; nickel; nitrous oxide; potassium ion; proton; rain; sea water; sodium ion; zinc ion, aerosol; anthropogenic source; atmospheric pollution; atmospheric transport; chemical composition; concentration (composition); ionic composition; long range transport; monsoon; observational method; pH; precipitation quality; rainwater; scavenging (chemistry); shipborne measurement, aerosol; air sampler; article; atmospheric transport; chemical analysis; chemical composition; controlled study; geochemistry; particulate matter; pH; precipitation; quality control; water sampling, Bay of Bengal; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 23 May 2015 08:31
Last Modified: 23 May 2015 08:31
URI: http://moeseprints.incois.gov.in/id/eprint/806

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