Temperature-driven meltwater production and hydrochemical variations at a glaciated alpine karst aquifer: implication for the atmospheric CO2 sink under global warming

	Temperature-driven meltwater production and hydrochemical variations at a glaciated alpine karst aquifer: implication for the atmospheric CO2 sink under global warming
	Cheng Zeng; Vivian Gremaud; Haitao Zeng; Zaihua Liu; Nico Goldscheider
	2012
Source Publication	Environmental Earth Sciences (IF:1.569[JCR-2016],1.844[5-Year])
Volume	65 Issue:8 Pages:2285-2297
Abstract	About two hydrological years of continuous data of discharge, temperature, electrical conductivity and pH have been recorded at the Glarey spring in the Tsanfleuron glaciated karst area in the Swiss Alps, to understand how glaciated karst aquifer systems respond hydrochemically to diurnal and seasonal recharge variations, and how calcite dissolution by glacial meltwater contributes to the atmospheric CO2 sink. A thermodynamic model was used to link the continuous data to monthly water quality data allowing the calculation of CO2 partial pressures and calcite saturation indexes. The results show diurnal and seasonal hydrochemical variations controlled chiefly by air temperature, the latter influencing karst aquifer recharge by ice and snowmelt. Karst process-related atmospheric CO2 sinks were more than four times higher in the melting season than those in the freezing season. This finding has implication for understanding the atmospheric CO2 sink in glaciated carbonate rock terrains: the carbon sink will increase with increasing runoff caused by global warming, i.e., carbonate weathering provides a negative feedback for anthropogenic CO2 release. However, this is a transient regulation effect that is most efficient when glacial meltwater production is highest, which in turn depends on the future climatic evolution.
Subject Area	环境地球化学
Indexed By	SCI
Language	英语
Document Type	期刊论文
Identifier	http://ir.gyig.ac.cn/handle/352002/4862
Collection	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
Recommended Citation GB/T 7714	Cheng Zeng,Vivian Gremaud,Haitao Zeng,et al. Temperature-driven meltwater production and hydrochemical variations at a glaciated alpine karst aquifer: implication for the atmospheric CO2 sink under global warming[J]. Environmental Earth Sciences,2012,65(8):2285-2297.
APA	Cheng Zeng,Vivian Gremaud,Haitao Zeng,Zaihua Liu,&Nico Goldscheider.(2012).Temperature-driven meltwater production and hydrochemical variations at a glaciated alpine karst aquifer: implication for the atmospheric CO2 sink under global warming.Environmental Earth Sciences,65(8),2285-2297.
MLA	Cheng Zeng,et al."Temperature-driven meltwater production and hydrochemical variations at a glaciated alpine karst aquifer: implication for the atmospheric CO2 sink under global warming".Environmental Earth Sciences 65.8(2012):2285-2297.

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