气候变化领域集成服务门户(CCPortal): Dynamics and potential drivers of CO2 concentration and evasion across temporal scales in high-alpine streams

CCPortal

DOI	10.1088/1748-9326/ab5cb8
	Dynamics and potential drivers of CO2 concentration and evasion across temporal scales in high-alpine streams
	Horgby Å.; Gómez-Gener L.; Escoffier N.; Battin T.J.
发表日期	2019
ISSN	17489318
卷号	14 期号:12
英文摘要	Carbon dioxide (CO2) evasion from streams greatly contributes to global carbon fluxes. Despite this, the temporal dynamics of CO2 and its drivers remain poorly understood to date. This is particularly true for high-altitude streams. Using high-resolution time series of CO2 concentration and specific discharge from sensors in twelve streams in the Swiss Alps, we studied over three years the responsiveness of both CO2 concentration and evasion fluxes to specific discharge at annual scales and at the scale of the spring freshet. On an annual basis, our results show dilution responses of the streamwater CO2 likely attributable to limited supply from sources within the catchment. Combining our sensor data with stable isotope analyses, we identify the spring freshet as a window where source limitation of the CO2 evasion fluxes becomes relieved. CO2 from soil respiration enters the streams during the freshet thereby facilitating CO2 evasion fluxes that are potentially relevant for the carbon fluxes at catchment scale. Our study highlights the need for long-term measurements of CO2 concentrations and fluxes to better understand and predict the role of streams for global carbon cycling. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Carbon fluxes; Co2 evasion fluxes; High-alpine streams; Responsiveness to runoff; Spring freshet
语种	英语
scopus关键词	Catchments; Runoff; Altitude streams; Carbon fluxes; CO2 concentration; High-alpine streams; Long-term measurements; Soil respiration; Stable-isotope analysis; Temporal dynamics; Carbon dioxide; carbon dioxide; carbon flux; catchment; concentration (composition); runoff; soil respiration; stable isotope; stream; streamwater; Alps
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154239
作者单位	Stream Biofilm and Ecosystem Research Laboratory, École Polytechnique Fédérale de Lausanne, Epfl, Lausanne, CH-1015, Switzerland; Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, CH-1015, Switzerland
推荐引用方式 GB/T 7714	Horgby Å.,Gómez-Gener L.,Escoffier N.,et al. Dynamics and potential drivers of CO2 concentration and evasion across temporal scales in high-alpine streams[J],2019,14(12).
APA	Horgby Å.,Gómez-Gener L.,Escoffier N.,&Battin T.J..(2019).Dynamics and potential drivers of CO2 concentration and evasion across temporal scales in high-alpine streams.Environmental Research Letters,14(12).
MLA	Horgby Å.,et al."Dynamics and potential drivers of CO2 concentration and evasion across temporal scales in high-alpine streams".Environmental Research Letters 14.12(2019).