書誌事項
- タイトル別名
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- Chemical composition of snow cover and rime at Mt.Zao, Yamagata Prefecture, Japan.
- ヤマガタケン ザオウ ノ セキセツ ト チャクヒョウ ノ カガク ソセイ
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The rime on trees at Mt. Zao (about 1680 m high), locally called ice monsters, is formed by repeated accretions of rime (freezing of supercooled water droplets which were transported by the NW monsoon) and snow particles fallen from clouds at several thousand metres high. To reveal the atmospheric chemical conditions of Mt. Zao, rime samples were taken on March 9 and snow samples of a pit on April 6 in 1994. Analyzed chemical compositions are: soluble Na+, Cl-, K+, Mg2+ from sea spray salt, non-sea salt (nss) SO42- and NO3- from human activity, nss-Ca2+ in dust from local roads, NH4+ from biological activity, and pH.<BR>Concentration of soluble substances in the snow, usually lower than that in the rime, increased with the intensity of the NW monsoon. The rime contained black oily substances, and the sonw samples with black oily substances have a more than 15μS/cm in electric conductivity.The enrichment factors of Cl-were 1.3 and 0.7 in snow and rime respectively. This suggests the occurence of“Chlorine loss”in the supercooled water droplets and the incorporation of HCl gas into ice nuclei of clouds above Mt. Zao.<BR>Rations nss-SO42-/NO3- in the snow and the rime were the same and larger than unity. It suggested that the sulfate and nitrate in snow and rime contained Sulfur-oxides and nitrogenoxides from human activities in the Asian continent. In Japan, The NW monsoon blows in winter and nss-Ca2+ and NH4+ increased in this period. This increase is attributed to the longdistance transport of nss-Ca2+ and NH4 from the Asian continent. Ratios nss-Ca2+/NH4+ were lower than unity in the snow and unity in the rime, this means that the origin of non-sea salt calcium is different from that of ammonium.
収録刊行物
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- 雪氷
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雪氷 58 (5), 393-403, 1996
公益社団法人 日本雪氷学会
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詳細情報 詳細情報について
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- CRID
- 1390001206462367360
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- NII論文ID
- 10002382529
- 10004003336
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- NII書誌ID
- AN00131221
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- ISSN
- 18836267
- 03731006
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- NDL書誌ID
- 4027598
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可