Spatial-temporal distributions of gaseous element mercury and particulate mercury in the Asian marine boundary layer
Spatial-temporal distributions of gaseous element mercury and particulate mercury in the Asian marine boundary layer
复制标题
亚洲海洋边界层气态元素汞和颗粒汞的时空分布
DOI：
10.1016/j.atmosenv.2015.11.036
复制
发表时间：
2016-02
影响因子：
5
通讯作者：
Xiong Tang
中科院分区：
文献类型：
--
作者：
Zhangwei Wang;Zhijia Ci;Xiaoshan Zhang;Xiong Tang
通过对2013 - 2014年春季和秋季亚洲海洋边界层（MBL）中气态汞（GEM）和颗粒态汞（HgP）浓度的测定，研究了GEM和HgP的时空分布特征。使用级联撞击器收集从10 μm到<0.4 μm的9个尺寸级分的HgPin。春季和秋季HgP 10浓度从陆地到外海呈下降趋势。春季和秋季HgP 10的平均（±SD）浓度分别为15.3 ± 9.1和15.8 ± 4.4 pg m− 3，而整个研究期间GEM的平均浓度为2.02 ± 1.08 ng m−3（N = 12，341），远高于其他偏远海洋。春季Hg P的粒径分布呈双峰型，主要分布在2.1 ~ 10 μm的粗粒中（57%），而秋季Hg P主要分布在<2.1 μm的细粒中。渤海中GEM和HgP 10的浓度普遍高于黄海和东海。此外，汞磷10浓度在秋季略高于春季，除了在BS的特定位置的测量数据。春季和秋季的平均干沉降通量分别为2.77 ng m−2d− 1和1.92 ng m−2d− 1，与北美农村地区的观测结果相当，但远低于中国城市的观测结果。此外，与细颗粒相比，粗颗粒贡献了超过90%的总干沉积汞由于更高的沉积速度。
We determined the concentrations of gaseous element mercury (GEM) and particulate mercury (HgP) 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 HgP. A cascade impactor was used to collect HgPin nine size fractions ranging from 10 μm to <0.4 μm. The concentrations of HgPin 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 15.3 ± 9.1 and 15.8 ± 4.4 pg m−3respectively, 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 HgPwas bi-modal during spring, and HgPwas found mainly (57%) in coarse fractions (2.1–10 μm), while HgPwas dominated by fine particles (<2.1 μm) 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 HgPwere calculated to be 2.77 ng m−2d−1during spring and 1.92 ng m−2d−1during 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 HgPdue to higher deposition velocities.
登录
查看更多内容
中国人为源大气汞排放清单更新
影响因子：
11.4
作者：
Zhang, Lei;Wang, Shuxiao;Liu, Xiang
通讯作者：
Liu, Xiang
影响因子：
6.3
作者：
Gustin, M. S.;Amos, H. M.;Heidecorn, K.
通讯作者：
Heidecorn, K.
影响因子：
11.4
作者：
Ye Wu;Shuxiao Wang;D. Streets;J. Hao;M. Chan;Jingkun Jiang
通讯作者：
Ye Wu;Shuxiao Wang;D. Streets;J. Hao;M. Chan;Jingkun Jiang
影响因子：
5
作者：
M. Sakata;K. Marumoto
通讯作者：
M. Sakata;K. Marumoto
影响因子：
5
作者：
Mary M. Lynam;G. Keeler
通讯作者：
Mary M. Lynam;G. Keeler