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题名: Spatial-temporal distributions of gaseous element mercury and particulate mercury in the Asian marine boundary layer
作者: Wang, Chunjie; Wang, Zhangwei; Ci, Zhijia; Zhang, Xiaoshan; Tang, Xiong
刊名: ATMOSPHERIC ENVIRONMENT
出版日期: 2016-02
卷号: 126, 页码:107-116
关键词: Gaseous element mercury ; Size-fractionated particulate mercury ; Asian marine boundary layer ; Dry deposition
DOI: 10.1016/j.atmosenv.2015.11.036
部门归属: 大气环境科学实验室
英文摘要: We determined the concentrations of gaseous element mercury (GEM) and particulate mercury (Hg-P) in the Asian marine boundary layer (MBL) during the spring and fall of 2013 and 2014 to investigate the spatial-temporal distributions of GEM and Hg-P. A cascade impactor was used to collect Hg-P in nine size fractions ranging from 10 mu m to <0.4 mu m. The concentrations of Hg-P in PM10 (hereafter referred to as HgP 10) tended to decrease from the land to the open sea both in spring and fall. The mean (+/- SD) concentrations of HgP 10 during spring and fall were 153 +/- 9.1 and 15.8 +/- 4.4 pg m(-3) respectively, while the mean GEM concentration during the entire study period was 2.02 +/- 1.08 ng m(-3) (N = 12,341), which was much higher than those of other remote oceans. Moreover, the size distributions of Hg-P was bi-modal during spring, and Hg-P was found mainly (57%) in coarse fractions (2.1-10 mu m), while Hg-P was dominated by fine particles (<2.1 mu m) during fall. The concentrations of GEM and HgP 10 in the Bohai Sea (BS) were generally higher than those in the Yellow Sea and East China Sea. Furthermore, the HgP 10 concentrations were slightly higher during fall than during spring except the data measured in the BS for its specific location. The average dry deposition fluxes of Hg-P were calculated to be 2.77 ng m(-2) d(-1) during spring and 1.92 ng m(-2) d(-1) during fall, respectively, which were comparable to those measured at rural sites in North America, but considerably lower than those measured in urban cities in China. Additionally, compared to fine particles, coarse particles contributed more than 90% to the total dry deposition of Hg-P due to higher deposition velocities. (C) 2015 Elsevier Ltd. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35713
Appears in Collections:大气环境科学实验室_期刊论文

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