Chemistry of aerosols over a semi-arid region: Evidence for acid neutralization by mineral dust

Details Chemistry of aerosols over a semi-arid region: Evidence for acid neutralization by mineral dust Chemistry of aerosols over a semi-arid region: Evidence for acid neutralization by mineral dust

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3323815r&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 23, CiteID L23815

Physics

7

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Constituent Sources And Sinks, Geochemistry: Composition Of Aerosols And Dust Particles, Hydrology: Anthropogenic Effects (4802, 4902)

Scientific paper

A two-year study based on chemical characteristics of ambient aerosols, from an urban site of a semi-arid region in western India, provides an unequivocal evidence for the quantitative neutralization of acidic constituents by mineral aerosols. The mineral dust component varied in the range 16-220 μg m-3 (Av: 88, sd: 42); and contributed to 69 +/- 5% of the TSP (range: 43-273 μg m-3, Av: 125, sd: 49). A characteristic feature of the in-situ chemical reactions is well reflected by the relative dominance of Ca2+ and HCO3 - ions in the water-soluble composition of aerosols and anti-correlation among HCO3 -/Ca2+ and ``Excess Acid''/Ca2+. A ubiquitous alkaline-nature of rainfall events over this high dust region further attests to our chemical data. Such regional-scale atmospheric transformation processes suggest the over estimation of negative radiative forcing (climate cooling) due to sulphate aerosols in the global climate models.

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