气候变化领域集成服务门户(CCPortal): The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost

CCPortal

DOI	10.1016/j.envpol.2020.115079
	The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost
	Gu, Jing; Pang, Qiaotong; Ding, Jinzhi; Yin, Runsheng; Yang, Yuanhe; Zhang, Yanxu
通讯作者	Zhang, YX (通讯作者)
发表日期	2020
ISSN	0269-7491
EISSN	1873-6424
卷号	265
英文摘要	Soils, especially permafrost in the Arctic and the Tibetan Plateau, are one of the largest reservoirs of mercury (Hg) in the global environment. The Hg concentration in the grassland soils over the Tibetan Plateau and its driving factors have been less studied. This study analyzes soil total mercury (STHg) concentrations and its vertical distribution in grassland soil samples collected from the Tibetan Plateau. We adopt a nested-grid high-resolution GEOS-Chem model to simulate atmospheric Hg deposition. The relationship between STHg and soil organic carbon (SOC), as well as atmospheric deposition, are explored. Our results show that the STHg concentrations in the Tibetan Plateau are 19.8 +/- 12.2 ng/g. The concentrations are higher in the south and lower in the north in the Tibetan Plateau, consistent with the previous results. Our model shows that the average deposition flux of Hg is 3.3 mu g m(-2) yr(-1), with 57% contributed by dry deposition of elemental mercury (Hg-0), followed by dry (19%) and wet (24%) deposition of divalent mercury. We calculate the Hg to carbon ratio (R-Hg:C) as 5.6 +/- 6.5 mu g Hg/g C, and the estimated STHg is 86.6 +/- 101.2 Gg in alpine grasslands in the Tibetan Plateau. We find a positive relationship between STHg and SOC in the Tibetan Plateau (r(2) = 0.36) and a similar positive relationship between STHg and atmospheric total Hg deposition (r(2) = 0.24). A multiple linear regression involving both variables better model the observed STHg (r(2) = 0.42). We conclude that SOC and atmospheric deposition influence STHg simultaneously in this region. The data provides information to quantify the size of the soil Hg pool in the Tibetan Plateau further, which has important implications for the Hg cycles in the permafrost regions as well as on the global scale. (C) 2020 Elsevier Ltd. All rights reserved.
关键词	SPATIAL-DISTRIBUTION ORGANIC-MATTER DEPOSITION PLATEAU TRANSFORMATION ACCUMULATION SPECIATION TRANSPORT LAYER
英文关键词	Soil mercury; Grassland; Tibetan Plateau; Soil organic carbon; Atmospheric deposition
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000564561100005
来源期刊	ENVIRONMENTAL POLLUTION
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/259781
推荐引用方式 GB/T 7714	Gu, Jing,Pang, Qiaotong,Ding, Jinzhi,et al. The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost[J]. 中国科学院青藏高原研究所,2020,265.
APA	Gu, Jing,Pang, Qiaotong,Ding, Jinzhi,Yin, Runsheng,Yang, Yuanhe,&Zhang, Yanxu.(2020).The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost.ENVIRONMENTAL POLLUTION,265.
MLA	Gu, Jing,et al."The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost".ENVIRONMENTAL POLLUTION 265(2020).