气候变化领域集成服务门户(CCPortal): Isotopic composition of total gaseous mercury at a high-altitude tropical forest site influenced by air masses from the East Asia continent and the Pacific Ocean

CCPortal

DOI	10.1016/j.atmosenv.2020.118110
	Isotopic composition of total gaseous mercury at a high-altitude tropical forest site influenced by air masses from the East Asia continent and the Pacific Ocean
	Nguyen L.S.P.; Sheu G.-R.; Fu X.; Feng X.; Lin N.-H.
发表日期	2021
ISSN	1352-2310
卷号	246
英文摘要	Gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM), particulate-bound mercury (PBM), and the isotopic composition of total gaseous mercury (TGM = GEM + GOM) were measured at the Lulin Atmospheric Background Station (LABS), a mountain background site downwind of the East Asia continent, from February 2015 to January 2016. Mean (±S.D.) concentrations of GEM, GOM, and PBM were 1.54 ± 0.34 ng m−3, 14.0 ± 27.8 pg m−3, and 2.6 ± 3.7 pg m−3, respectively. Concentration-Weighted Trajectory (CWT) analysis indicated that East and coastal China were the main source regions of elevated GEM observed at LABS. Weekly integrated TGM showed significant variations in δ202HgTGM (−0.42 to 0.41‰) and Δ199HgTGM (−0.31 to −0.13‰). Both δ202HgTGM and Δ199HgTGM showed clear seasonal variations, but the seasonal pattern of δ202HgTGM was different from that of Δ199HgTGM. The lowest mean δ202HgTGM was observed in spring (−0.15‰), while the lowest mean Δ199HgTGM was observed in summer (−0.24‰). A significant positive correlation (R2 = 0.38, p < 0.01) existed between δ202HgTGM and normalized difference vegetation index (NDVI), suggesting vegetation activity was an important factor controlling the seasonal variation of δ202HgTGM. In contrast, air mass transport path, which influences the source region of TGM to LABS, was likely the driver for the seasonal variations of Δ199HgTGM. Furthermore, results from the air mass classification showed distinguishable Δ199HgTGM signature for different air mass source regions, with air masses from South China Sea and western Pacific Ocean being characterized by more negative Δ199HgTGM (−0.25 ± 0.04‰). Results of this research demonstrated a clear difference in isotopic compositions of atmospheric Hg between continental and marine air masses. © 2020 Elsevier Ltd
英文关键词	Isotopes; Mercury (metal); Oceanography; Tropics; Vegetation; Air mass classification; Gaseous elemental mercury; Gaseous oxidized mercuries; Isotopic composition; Normalized difference vegetation index; Particulate bound mercury; Positive correlations; Total gaseous mercuries; Meteorology; mercury; air mass; concentration (composition); isotopic composition; mass transport; mercury (element); seasonal variation; tropical forest; air pollution; altitude; Article; Asia; China; concentration (parameter); Pacific Ocean; particulate matter; priority journal; seasonal variation; South China Sea; spring; summer; tropical rain forest; vegetation; Pacific Ocean; South China Sea
语种	英语
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169080
作者单位	Department of Atmospheric Sciences, National Central University, Jhongli, 320, Taiwan; Center for Environmental Monitoring and Technology, National Central University, Jhongli, 320, Taiwan; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, Shaanxi 710061, China
推荐引用方式 GB/T 7714	Nguyen L.S.P.,Sheu G.-R.,Fu X.,et al. Isotopic composition of total gaseous mercury at a high-altitude tropical forest site influenced by air masses from the East Asia continent and the Pacific Ocean[J],2021,246.
APA	Nguyen L.S.P.,Sheu G.-R.,Fu X.,Feng X.,&Lin N.-H..(2021).Isotopic composition of total gaseous mercury at a high-altitude tropical forest site influenced by air masses from the East Asia continent and the Pacific Ocean.Atmospheric Environment,246.
MLA	Nguyen L.S.P.,et al."Isotopic composition of total gaseous mercury at a high-altitude tropical forest site influenced by air masses from the East Asia continent and the Pacific Ocean".Atmospheric Environment 246(2021).