气候变化领域集成服务门户(CCPortal): Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling

CCPortal

DOI	10.5194/acp-15-7103-2015
	Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling
	Song, S.; Selin, N. E.; Soerensen, A. L.; Angot, H.; Artz, R.; Brooks, S.; Brunke, E. -G.; Conley, G.; Dommergue, A.; Ebinghaus, R.; Holsen, T. M.; Jaffe, D. A.; Kang, S.; Kelley, P.; Luke, W. T.; Magand, O.; Marumoto, K.; Pfaffhuber, K. A.; Ren, X.; Sheu, G. -R.; Slemr, F.; Warneke, T.; Weigelt, A.; Weiss-Penzias, P.; Wip, D. C.; Zhang, Q.
通讯作者	Song, S (通讯作者)
发表日期	2015
ISSN	1680-7316
EISSN	1680-7324
起始页码	7103
结束页码	7125
卷号	15 期号:12
英文摘要	We perform global-scale inverse modeling to constrain present-day atmospheric mercury emissions and relevant physiochemical parameters in the GEOS-Chem chemical transport model. We use Bayesian inversion methods combining simulations with GEOS-Chem and ground-based Hg-0 observations from regional monitoring networks and individual sites in recent years. Using optimized emissions/parameters, GEOS-Chem better reproduces these ground-based observations and also matches regional over-water Hg-0 and wet deposition measurements. The optimized global mercury emission to the atmosphere is 5.8 Gg yr(-1). The ocean accounts for 3.2 Gg yr(-1) (55 % of the total), and the terrestrial ecosystem is neither a net source nor a net sink of Hg-0. The optimized Asian anthropogenic emission of Hg-0 (gas elemental mercury) is 650-1770 Mg yr(-1), higher than its bottom-up estimates (550-800 Mg yr(-1)). The ocean parameter inversions suggest that dark oxidation of aqueous elemental mercury is faster, and less mercury is removed from the mixed layer through particle sinking, when compared with current simulations. Parameter changes affect the simulated global ocean mercury budget, particularly mass exchange between the mixed layer and subsurface waters. Based on our inversion results, we re-evaluate the long-term global biogeochemical cycle of mercury, and show that legacy mercury becomes more likely to reside in the terrestrial ecosystem than in the ocean. We estimate that primary anthropogenic mercury contributes up to 23 % of present-day atmospheric deposition.
关键词	GASEOUS ELEMENTAL MERCURY AIR-SEA EXCHANGE DRY DEPOSITION DIFFUSION-COEFFICIENT OXIDIZED MERCURY DEPLETION EVENTS NATURAL SOURCES SURFACE MODEL OCEAN
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000357117500037
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258621
推荐引用方式 GB/T 7714	Song, S.,Selin, N. E.,Soerensen, A. L.,et al. Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling[J]. 中国科学院青藏高原研究所,2015,15(12).
APA	Song, S..,Selin, N. E..,Soerensen, A. L..,Angot, H..,Artz, R..,...&Zhang, Q..(2015).Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling.ATMOSPHERIC CHEMISTRY AND PHYSICS,15(12).
MLA	Song, S.,et al."Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling".ATMOSPHERIC CHEMISTRY AND PHYSICS 15.12(2015).