Monsoon-driven transport of organochlorine pesticides and polychlorinated biphenyls to the Tibetan Plateau: three year atmospheric monitoring study.
Monsoon-driven transport of organochlorine pesticides and polychlorinated biphenyls to the Tibetan Plateau: three year atmospheric monitoring study.
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DOI：
10.1021/es305201s
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发表时间：
2013-03
影响因子：
11.4
通讯作者：
Jiu-jiang Sheng;Xiaoping Wang;P. Gong;D. Joswiak;L. Tian;T. Yao;K. Jones
中科院分区：
文献类型：
--
作者：
Jiu-jiang Sheng;Xiaoping Wang;P. Gong;D. Joswiak;L. Tian;T. Yao;K. Jones
由于印度季风系统的影响，青藏高原的气团输送和入高原的气团输送具有明显的季节性。为研究青藏高原东南部雅鲁藏布大峡谷附近大气中持久性有机污染物（POPs）浓度对印度季风变化的响应，在雅鲁藏布大峡谷附近的一个观测站进行了为期3年的大气监测（2008-2011）。空气中多氯联苯和六氯环己烷的浓度一般与其他偏远地区的浓度相当，而滴滴涕的浓度则远远高于极地地区、北美落基山脉和欧洲阿尔卑斯山报告的浓度。滴滴涕和多氯联苯的浓度密切相关的印度季风的循环模式，显示较高的值在季风季节（5月至9月）和较低的值在非季风季节（11月至3月）。观察到α-六氯环己烷和γ-六氯环己烷的“双峰”模式，春季和秋季浓度较高，夏季（季风季节）浓度较低。季风季节的雨水清除可能导致大气中六氯环己烷浓度较低。本文阐明了印度季风对持久性有机污染物向青藏高原大气输送的作用。
Due to the influence of the Indian monsoon system, air mass transport in and to the Tibetan Plateau shows obvious seasonality. In order to assess the responses of atmospheric concentrations of persistent organic pollutants (POPs) to the Indian Monsoon fluctuation patterns, a three year air monitoring program (2008-2011) was conducted in an observation station close to the Yarlung Tsangpo Grand Canyon, southeastern Tibetan Plateau. The air concentrations of polychlorinated biphenyls (PCBs) and hexachlorocyclohexanes (HCHs) are generally comparable to those of other remote regions, whereas the concentrations of DDTs are much higher than reported for the polar regions, the North American Rocky Mountains, and the European Alps. The concentrations of DDTs and PCBs were strongly linked to the cyclic patterns of the Indian monsoon, displaying higher values in the monsoon season (May-September) and lower values in the nonmonsoon season (November-March). A "bimodal" pattern was observed for α- and γ-HCH, with higher concentrations in spring and autumn and lower concentrations in the summer (monsoon season). Rain scavenging in the monsoon season likely resulted in the lower HCH concentrations in the atmosphere. This paper sheds lights on the role the Indian monsoon plays on the atmospheric transport of POPs to the Tibetan Plateau.