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标题：Is cloud seeding in coastal Antarctica linked to bromine and nitrate variability in snow?
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作者：Runa Antony ; Meloth Thamban ; K P Krishnan 等
期刊名称：Environmental Research Letters
印刷版ISSN：1748-9326
电子版ISSN：1748-9326
出版年度：2010
卷号：5
期号：1
页码：014009
DOI：10.1088/1748-9326/5/1/014009
语种：English
出版社：IOP Publishing Ltd
摘要：Considering the significance of methanesulfonate (MSA) in the sulfur cycle and global climate, we analyzed MSA and other ionic species in snow from the coastal Larsemann Hills, East Antarctica. MSA concentrations recorded were high (0.58 ± 0.7 µM) with ice-cap regions showing significantly higher concentrations (df = 10, p < 0.001) than ice-free regions. High nutrient concentration in ice-cap snow appears to have favored algal growth (7.6 × 10² cells l^{− 1}) with subsequent production of brominated compounds. The consequent elevated Br⁻ (3.2 ± 2.2 µM) in the ice-cap region could result in the release of Br atoms through photoactivated reactions on aerosols and the snow surface. Activated Br atoms in the atmosphere could react with ozone leading to BrO enhancement with subsequent dimethylsulfide (DMS) oxidation and production of sulfur aerosols. Since BrO based DMS oxidation is much faster than the OH/NO₃ pathway, elevated Br⁻ in ice-cap snow could contribute more than ice-free sites towards formation of cloud condensation nuclei at the expense of ozone.