干旱区生态环境知识资源中心(Arid): 祁连山中段降水化学的环境意义研究

Arid

	祁连山中段降水化学的环境意义研究
其他题名	Environmental Significance of Wet Deposition Composition in the Central Qilian Mountains, China
	李宗杰 1; 李宗省 2; 田青 1; 宋玲玲 1; 贾冰 2; 郭瑞 2; 宋耀选 2; 苏索南 3; 韩春坛 2
来源期刊	环境科学
ISSN	0250-3301
出版年	2014
卷号	35 期号:12 页码:4465-4474
中文摘要	运用相关分析、趋势分析、富集因子法、海盐示踪法和HYSPLIT模型,对2012-07-23~2013-11-12祁连山中段葫芦沟流域降水常量离子的化学特征分析表明,降水中离子浓度大小顺序为Ca~(2+)>SO_4~(2-)>Mg~(2+)>Cl~->Na~+>NO_3~->K~+,其中SO_4~(2-)和Ca~(2+)是高浓度离子,阳离子总浓度显著高于阴离子总浓度;降水电导率的变化范围为2.26~482muS·cm~(-1),平均值为41.9 muS·cm~(-1);区域降水为SO_4~(2-)-Mg~(2+)-Ca~(2+)型,上述3种离子的浓度占离子总浓度的70%以上;就季节变化而言,降水离子在夏季呈最低浓度,而在冬、春季降水量小但离子浓度高,表现出典型的"碱雨"特征;中亚和我国西北干旱区随西风环流带来的区域陆源物质是化学离子的主要来源,人为污染源产生的气溶胶是次要来源;更重要的是,不同大气环流背景下降水离子浓度也呈现不同特征,主要表现为季风源降水、混合源降水(季风和西风的影响)和西风源降水,主要是由于不同大气环流条件下的降水淋溶过程及其强度所致.此外,降水离子浓度与降水量、风速之间的相关性反映了局地气候环境的影响.
英文摘要	A total of 90 precipitation samples were collected from individual precipitation events at the Qilian Alpine Ecology & Hydrology Research Station (Hulugou Station, 30°47’N, 90°58’E; 3260 m a.s.l) located in the central Qilian Mountains from August 2012 to November 2013. All samples were analyzed for major cations (Na~+, K~+, Ca~(2+) and Mg~(2+)), anions (Cl~-, NO_3~- and SO_4~(2-)) and conductivity. Precipitation EC values ranged from 2.26 to 482 muS·cm~(-1) with an average value of 41.9 muS·cm~(-1). The precipitation was of SO_4~(2-)-Mg~(2+)-Ca~(2+) type, which contributed>70% to the total ionic concentration. The same as the precipitation alkalinity, precipitation events occurred around summer showed lower concentrations, while it had higher concentrations in winter and spring with little precipitation and larger wind speed. Enrichment factor (EF), correlation and factor analysis indicated that regional crustal aerosols and species from central Asian and northwestern China arid regions brought by the westerly circulation were the major sources for these ions, some dust from human pollution were the secondary sources, and the contribution of sea salt was the least due to the long distance transport. These characteristics could be also confirmed by the correlation between ionic concentrations and metrological data in the study region. It is also interesting that the precipitation chemistry was different under the different atmospheric circulation: the monsoon precipitation, the interaction precipitation events (influenced both by monsoon and westerly) and the westerly precipitation.
中文关键词	降水 ; 化学 ; 大气环流 ; 来源 ; 祁连山
英文关键词	precipitation chemical atmospheric circulation source Qilian Mountain
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5298866
来源机构	中国科学院西北生态环境资源研究院 ; 甘肃农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231358
作者单位	1.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国; 2.中国科学院寒区旱区环境与工程研究所, 中国科学院内陆河流域生态水文重点实验室, 兰州, 甘肃 730000, 中国; 3.野牛沟国家气象站, 祁连, 810400
推荐引用方式 GB/T 7714	李宗杰,李宗省,田青,等. 祁连山中段降水化学的环境意义研究[J]. 中国科学院西北生态环境资源研究院, 甘肃农业大学,2014,35(12):4465-4474.
APA	李宗杰.,李宗省.,田青.,宋玲玲.,贾冰.,...&韩春坛.(2014).祁连山中段降水化学的环境意义研究.环境科学,35(12),4465-4474.
MLA	李宗杰,et al."祁连山中段降水化学的环境意义研究".环境科学 35.12(2014):4465-4474.