| 长江源区大气降水化学特征及离子来源 |
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| 引用本文： | 汪少勇,何晓波,吴锦奎,丁永建,胡召富,王利辉,杨贵森.长江源区大气降水化学特征及离子来源[J].环境科学,2019,40(10):4431-4439. |
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| 作者姓名： | 汪少勇 何晓波 吴锦奎 丁永建 胡召富 王利辉 杨贵森 |
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| 作者单位： | 中国科学院西北生态环境资源研究院,冰冻圈科学国家重点实验室,兰州730000;中国科学院西北生态环境资源研究院,内陆河流域生态水文重点实验室,兰州730000;中国科学院大学,北京100049;中国科学院西北生态环境资源研究院,冰冻圈科学国家重点实验室,兰州730000;中国科学院西北生态环境资源研究院,内陆河流域生态水文重点实验室,兰州730000;中国科学院西北生态环境资源研究院,冰冻圈科学国家重点实验室,兰州730000;中国科学院大学,北京100049;中国科学院大学,北京,100049 |
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| 基金项目： | 国家重点研发计划项目（2017YFC0405704，2017YFC0405706）；国家自然科学基金重点项目（41730751）；中央级公益性科研院所基本科研业务费专项（CKSF2017045）；冰冻圈科学国家重点实验室自主课题项目（SKLCS-ZZ-2018） |
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| 摘 要： | 基于长江源区冬克玛底流域2013年6～9月采集的64个降水样品,分析了降水的pH值、电导率及离子浓度特征,并应用因子分析、相关分析、富集因子及后向轨迹法,讨论了降水离子主要来源及其与大气环流的联系.结果表明,长江源区冬克玛底流域降水pH值变化范围为5. 26～9. 25,加权平均值为6. 70;电导率变化范围为0. 23～28. 70μS·cm-1,加权平均值为3. 45μS·cm-1,低于瓦里关全球大气本底站降水电导率;总离子浓度变化范围为7. 0～376. 9μeq·L-1,平均总浓度仅为40. 8μeq·L-1;各离子加权平均浓度大小顺序为:HCO_3~- NH_4~+ Ca~(2+) NO_3~- SO_4~(2-) Na~+ Cl~- K~+ Mg~(2+); HCO_3~-、NH_4~+、Ca~(2+)和NO_3~-是降水中的主要离子,占总离子浓度的74. 75%;相对酸度(FA)分析表明,有97. 8%的降水酸度被碱性物质中和,同时中和因子(NF)分析表明NH_4~+和Ca~(2+)对降水酸性的中和起主导作用;研究区降水离子主要来自陆源的贡献,而来自海源的输入则相对较少;结合气团的后向轨迹分析发现,不同来源的总离子浓度差异明显,其加权平均浓度大小顺序为:局地源西风源季风源,表明不同的大气环流背景和气团来源对降水化学组成具有重要影响.长江源区大气降水受人类活动影响较小,其降水化学特征一定程度上可以代表偏远地区的大气质量状况和本底值.研究结果能够为长江源区水质的保护以及为评估人类活动对该区域大气环境的影响提供科学依据.
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| 关 键 词： | 青藏高原 长江源区 大气降水 化学 离子来源 |
| 收稿时间： | 2019/3/25 0:00:00 |
| 修稿时间： | 2019/5/8 0:00:00 |
Chemical Characteristics and Ionic Sources of Precipitation in the Source Region of the Yangtze River |
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| WANG Shao-yong,HE Xiao-bo,WU Jing-kui,DING Yong-jian,HU Zhao-fu,WANG Li-hui and YANG Gui-sen.Chemical Characteristics and Ionic Sources of Precipitation in the Source Region of the Yangtze River[J].Chinese Journal of Environmental Science,2019,40(10):4431-4439. |
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| Authors: | WANG Shao-yong HE Xiao-bo WU Jing-kui DING Yong-jian HU Zhao-fu WANG Li-hui and YANG Gui-sen |
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| Institution: | State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China,State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China,State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China and University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | |
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| Keywords: | the Qinghai-Tibet Plateau source region of the Yangtze River precipitation chemical ionic sources |
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