DOI: 10.1016/j.atmosenv.2014.01.039
Scopus记录号: 2-s2.0-84894143390
论文题名: Chemical composition of the inorganic fraction of cloud-water at a high altitude station in West India
作者: Budhavant K ; B ; , Rao P ; S ; P ; , Safai P ; D ; , Granat L ; , Rodhe H
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 88 起始页码: 59
结束页码: 65
语种: 英语
英文关键词: Acidic deposition
; Inorganic ions
; PH
; Rainwater
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: 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+, 4 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. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80696
Appears in Collections: 气候变化事实与影响
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作者单位: Maldives Climate Observatory-Hanimaadhoo, Hanimaadhoo, Maldives; Indian Institute of Tropical Meteorology, Pune, Maharashtra, India; Department of Meteorology, Stockholm University, Stockholm, Sweden
Recommended Citation:
Budhavant K,B,, Rao P,et al. Chemical composition of the inorganic fraction of cloud-water at a high altitude station in West India[J]. Atmospheric Environment,2014-01-01,88