Atmospheric mercury speciation dynamics at the high-altitude Pic du Midi Observatory, southern France

	Atmospheric mercury speciation dynamics at the high-altitude Pic du Midi Observatory, southern France
	Xuewu Fu; Nicolas Marusczak; Lars-Eric Heimbürger; Bastien Sauvage; François Gheusi; Eric M. Prestbo; Jeroen E. Sonke
	2016
发表期刊	Atmospheric Chemistry and Physics
卷号	16 期号:9 页码:5623-5639
摘要	Continuous measurements of atmospheric gaseous elemental mercury (GEM), particulate bound mercury (PBM) and gaseous oxidized mercury (GOM) at the high-altitude Pic du Midi Observatory (PDM Observatory, 2877aEuro-maEuro-a.s.l.) in southern France were made from November 2011 to November 2012. The mean GEM, PBM and GOM concentrations were 1.86aEuro-ngaEuro-m(-3), 14aEuro-pgaEuro-m(-3) and 27aEuro-pgaEuro-m(-3), respectively and we observed 44 high PBM (peak PBM values of 33-98aEuro-pgaEuro-m(-3)) and 61 high GOM (peak GOM values of 91-295aEuro-pgaEuro-m(-3)) events. The high PBM events occurred mainly in cold seasons (winter and spring) whereas high GOM events were mainly observed in the warm seasons (summer and autumn). In cold seasons the maximum air mass residence times (ARTs) associated with high PBM events were observed in the upper troposphere over North America. The ratios of high PBM ARTs to total ARTs over North America, Europe, the Arctic region and Atlantic Ocean were all elevated in the cold season compared to the warm season, indicating that the middle and upper free troposphere of the Northern Hemisphere may be more enriched in PBM in cold seasons. PBM concentrations and PBMaEuro-a center dot aEuro-GOM ratios during the high PBM events were significantly anti-correlated with atmospheric aerosol concentrations, air temperature and solar radiation, suggesting in situ formation of PBM in the middle and upper troposphere. We identified two distinct types of high GOM events with the GOM concentrations positively and negatively correlated with atmospheric ozone concentrations, respectively. High GOM events positively correlated with ozone were mainly related to air masses from the upper troposphere over the Arctic region and middle troposphere over the temperate North Atlantic Ocean, whereas high GOM events anti-correlated with ozone were mainly related to air masses from the lower free troposphere over the subtropical North Atlantic Ocean. The ARTs analysis demonstrates that the lower and middle free troposphere over the North Atlantic Ocean was the largest source region of atmospheric GOM at the PDM Observatory. The ratios of high GOM ARTs to total ARTs over the subtropical North Atlantic Ocean in summer were significantly higher than those over the temperate and sub-arctic North Atlantic Ocean as well as that over the North Atlantic Ocean in other seasons, indicating abundant in situ oxidation of GEM to GOM in the lower free troposphere over the subtropical North Atlantic Ocean in summer.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6495
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Xuewu Fu,Nicolas Marusczak,Lars-Eric Heimbürger,et al. Atmospheric mercury speciation dynamics at the high-altitude Pic du Midi Observatory, southern France[J]. Atmospheric Chemistry and Physics,2016,16(9):5623-5639.
APA	Xuewu Fu.,Nicolas Marusczak.,Lars-Eric Heimbürger.,Bastien Sauvage.,François Gheusi.,...&Jeroen E. Sonke.(2016).Atmospheric mercury speciation dynamics at the high-altitude Pic du Midi Observatory, southern France.Atmospheric Chemistry and Physics,16(9),5623-5639.
MLA	Xuewu Fu,et al."Atmospheric mercury speciation dynamics at the high-altitude Pic du Midi Observatory, southern France".Atmospheric Chemistry and Physics 16.9(2016):5623-5639.

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