Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-495-2018 |
Gaseous elemental mercury (GEM) fluxes over canopy of two typical subtropical forests in south China | |
Yu, Qian1; Luo, Yao1; Wang, Shuxiao1,2; Wang, Zhiqi1; Hao, Jiming1,2; Duan, Lei1,2 | |
2018-01-17 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:1页码:495-509 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Mercury (Hg) exchange between forests and the atmosphere plays an important role in global Hg cycling. The present estimate of global emission of Hg from natural source has large uncertainty, partly due to the lack of chronical and valid field data, particularly for terrestrial surfaces in China, the most important contributor to global atmospheric Hg. In this study, the micrometeorological method (MM) was used to continuously observe gaseous elemental mercury (GEM) fluxes over forest canopy at a mildly polluted site (Qianyanzhou, QYZ) and a moderately polluted site (Huitong, HT, near a large Hg mine) in subtropical south China for a full year from January to December in 2014. The GEM flux measurements over forest canopy in QYZ and HT showed net emission with annual average values of 6.67 and 0.30 ng m(-2) h(-1), respectively. Daily variations of GEM fluxes showed an increasing emission with the increasing air temperature and solar radiation in the daytime to a peak at 13: 00, and decreasing emission thereafter, even as a GEM sink or balance at night. High temperature and low air Hg concentration resulted in the high Hg emission in summer. Low temperature in winter and Hg absorption by plant in spring resulted in low Hg emission, or even adsorption in the two seasons. GEM fluxes were positively correlated with air temperature, soil temperature, wind speed, and solar radiation, while it is negatively correlated with air humidity and atmospheric GEM concentration. The lower emission fluxes of GEM at the moderately polluted site (HT) when compared with that in the mildly polluted site (QYZ) may result from a much higher adsorption fluxes at night in spite of a similar or higher emission fluxes during daytime. This shows that the higher atmospheric GEM concentration at HT restricted the forest GEM emission. Great attention should be paid to forests as a crucial increasing Hg emission source with the decreasing atmospheric GEM concentration in polluted areas because of Hg emission abatement in the future. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000422872100001 |
WOS关键词 | AIR-SURFACE EXCHANGE ; SPECIATED ATMOSPHERIC MERCURY ; AIR/SURFACE EXCHANGE ; EMISSIONS ; SOILS ; ACCUMULATION ; MODEL ; VAPOR ; TEMPERATURE ; CANADA |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30368 |
专题 | 地球科学 |
作者单位 | 1.Tsinghua Univ, Sch Environm, State Key Lab Environm Simulat & Pollut Control, Beijing 100084, Peoples R China; 2.Tsinghua Univ, Collaborat Innovat Ctr Reg Environm Qual, Beijing 100084, Peoples R China |
推荐引用方式 GB/T 7714 | Yu, Qian,Luo, Yao,Wang, Shuxiao,et al. Gaseous elemental mercury (GEM) fluxes over canopy of two typical subtropical forests in south China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(1):495-509. |
APA | Yu, Qian,Luo, Yao,Wang, Shuxiao,Wang, Zhiqi,Hao, Jiming,&Duan, Lei.(2018).Gaseous elemental mercury (GEM) fluxes over canopy of two typical subtropical forests in south China.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(1),495-509. |
MLA | Yu, Qian,et al."Gaseous elemental mercury (GEM) fluxes over canopy of two typical subtropical forests in south China".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.1(2018):495-509. |
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