DOI: 10.1016/j.atmosenv.2020.117547
论文题名: Characteristics of the air‒sea exchange of gaseous mercury and deposition flux of atmospheric mercury at an island near the boundary of the Bohai Sea and Yellow Sea
作者: Wang C. ; Wang Z. ; Zhang X.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 232 语种: 英语
英文关键词: Seawater
; Atmospheric mercury
; Deposition fluxes
; Dissolved gaseous mercury
; Gaseous elemental mercury
; Maximum concentrations
; Meteorological parameters
; Seasonal patterns
; Wet deposition flux
; Deposition
; deferiprone
; mercury
; sea water
; air-sea interaction
; atmospheric chemistry
; concentration (composition)
; mercury (element)
; precipitation (chemistry)
; seasonal variation
; seawater
; water temperature
; wet deposition
; air
; Article
; atmospheric deposition
; autumn
; Bohai Sea
; China
; concentration (parameter)
; gas exchange
; maximum concentration
; meteorology
; minimum concentration
; precipitation
; priority journal
; sea
; solar radiation
; spring
; summer
; surface property
; water temperature
; wet deposition
; winter
; Yellow Sea
; Bohai Sea
; Changdao Islands
; China
; Pacific Ocean
; Shandong
; Yellow Sea
; Yellow Sea
学科: Air‒sea exchange
; Dissolved gaseous mercury
; Diurnal cycle
; Seasonal variation
; Total mercury
; Wet deposition flux
中文摘要: The variations of dissolved gaseous mercury (DGM, mainly Hg0), air‒sea exchange of Hg0, and deposition of atmospheric mercury were very limited in nearshore regions of North China. Nearly two years measurements of DGM in surface seawater and gaseous elemental mercury (GEM or Hg0) in the atmosphere over the Changdao Island were conducted to elucidate the characteristic of air‒sea exchange of Hg0 based on meteorological parameters. Simultaneously, the wet deposition fluxes of atmospheric Hg were also calculated based on the precipitation amounts and concentrations of total mercury in precipitation (THgp). The results show that both DGM and Hg0 flux exhibit a distinct seasonal pattern with the order of summer (47.7 pg l−1 and 1.46 ng m−2 h−1), spring (24.6 pg l−1 and 0.82 ng m−2 h−1), fall (21.7 pg l−1 and 0.70 ng m−2 h−1), and winter (19.0 pg l−1 and 0.21 ng m−2 h−1). However, a striking feature in winter is that the study site and peripheral area sporadically act as a sink of atmospheric Hg0 as a result of elevated GEM concentrations and low water temperature and solar radiation. The seasonal pattern of saturation was in line with that of DGM. In addition, a distinct diurnal cycle of DGM was observed with maximum concentrations at midday and minimum concentrations in nighttime during the whole study period, especially in summer. These remarkable seasonal and diurnal patterns indicate that the elevated DGM concentration in summer and midday appears mainly a photochemically driven. The mean unfiltered (UTHg) and dissolved (DTHg) seawater THg concentrations were 1.43 ± 0.94 and 0.53 ± 0.19 ng l−1, respectively. On average, the mean DTHg/UTHg ratio was 0.45 ± 0.16, indicating that less than half of THg was concentrated in DTHg. There was no significant relationships between DGM and DTHg. Seasonal concentrations of THgp were 17.3, 7.4, 7.0, and 27.9 ng l−1, whereas seasonal wet deposition fluxes were 1.28, 1.31, 0.82, and 0.62 μg m−2 yr−1 for spring, summer, fall, and winter, respectively. Overall, the THgp concentrations varied from 3.9 to 60.1 ng l−1 with a mean value of 16.4 ng l−1, and the direct wet deposition flux was 4.03 μg m−2 yr−1, representing approximately 57.4% of the annual evasion flux of Hg0 (7.02 μg m−2 yr−1). © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160750
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing, 100085, China
Recommended Citation:
Wang C.,Wang Z.,Zhang X.. Characteristics of the air‒sea exchange of gaseous mercury and deposition flux of atmospheric mercury at an island near the boundary of the Bohai Sea and Yellow Sea[J]. Atmospheric Environment,2020-01-01,232