(L773:1352 2310) srt2:(2010-2014)
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- Budhavant, K. B. (author)
Chemical composition of the inorganic fraction of cloud-water at a high altitude site in West India
- Article/chapterEnglish2014
Publisher, publication year, extent ...
- Elsevier BV,2014
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:su-101085
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-101085URI
- https://doi.org/10.1016/j.atmosenv.2014.01.039DOI
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- Language:English
- Summary in:English
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Notes
- Data from a ground-based cloud-water collection system intercepting water from clouds at a mountain field station, Sinhagad near Pune in India are presented. This study was part of an Indo-Swedish Collaboration Project on Atmospheric Brown Cloud-Asia (ABC-A). Cloud-water and rainwater (wet-only) samples were collected during June 2007-Dec. 2010. Concentrations of major anions and cations were determined. Ion concentrations were generally higher (NO3-, about 8 times; SO42- and K+, 5 times; NH4+ times and Cl-, Na+, Ca2+, Mg2+ 3 times) in cloud-water samples than in rainwater samples collected during the same days. The average pH of cloud-water samples was 6.0 with about 20% of the values below 5.6 and only 4% less than 5.0. Despite high concentrations of SO42- and NO3- the cloud water samples were on average not more acidic than rainwater samples. This is different from most of the other studies of cloud-water composition which have noted a substantially higher acidity (i.e. lower pH) in cloud-water than in rainwater. The slightly alkaline (pH > 5.6) nature of the cloud-water samples is mainly due to the presence of soil derived calcium carbonate in quantities more than enough to neutralize the acids or their precursors. A separation of the cloud-water data into trajectory groups showed that samples in air-masses having spent the last few days over the Indian sub-continent were in general more acidic (due to anthropogenic emissions) than those collected during days with air-masses of marine origin. A high correlation mutually between Ca2+, Na+, NO3- and SO42- makes it difficult to estimate the contribution to SO42- from different sources. Anthropogenic SO2- emissions and soil dust may both give important contributions.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
- rainwater
- inorganic ions
- acidic deposition
- pH
- atmosfärvetenskap
- Atmospheric Sciences
Added entries (persons, corporate bodies, meetings, titles ...)
- Rao, P. S. P. (author)
- Safai, P. D. (author)
- Granat, L. (author)
- Rodhe, Henning,1941-Stockholms universitet,Meteorologiska institutionen (MISU)(Swepub:su)rodhe (author)
- Stockholms universitetMeteorologiska institutionen (MISU) (creator_code:org_t)
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- In:Atmospheric Environment: Elsevier BV88, s. 59-651352-23101873-2844
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