气候变化领域集成服务门户(CCPortal): Greenhouse gas emissions (CO2-CH4-N2O) along a large reservoir-downstream river continuum: The role of seasonal hypoxia

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DOI	10.1002/lno.12544
	Greenhouse gas emissions (CO2-CH4-N2O) along a large reservoir-downstream river continuum: The role of seasonal hypoxia
	Wu, Zetao; Yu, Dan; Yu, Qibiao; Liu, Qian; Zhang, Mingzhen; Dahlgren, Randy A.; Middelburg, Jack J.; Qu, Liyin; Li, Quanlong; Guo, Weidong; Chen, Nengwang
发表日期	2024
ISSN	0024-3590
EISSN	1939-5590
起始页码	69
结束页码	5
卷号	69 期号:5
英文摘要	Recent studies suggest that hypolimnetic respiration may be responsible for greenhouse gas (GHG) emissions from deep reservoirs. Currently, quantitative evaluation of aerobic vs. anaerobic processes and priming (enhanced processing of organic matter due to the addition of labile carbon) in regulating GHG production and emissions across the reservoir-downstream continuum remains largely unknown. High-resolution, annual time-series observations in a large, subtropical reservoir (Shuikou) experiencing seasonal hypoxia in southeast China indicate that aerobic hypolimnetic CO2 production dominated in most periods of the stratified spring/summer with higher rates at higher temperatures. In addition, anaerobic production of hypolimnetic CO2 occurred in the late stratified spring/summer period, which stimulated hypolimnetic production of CH4 and N2O. Incubation experiments showed that priming in spring enhanced both aerobic and anaerobic production of excess GHGs. A late spring flood event generated the highest daily efflux of CO2 through the flushing of GHG-enriched hypolimnion waters. Turbine degassing contributed 59%, 93%, and 63% of annual CO2, CH4, and N2O effluxes, respectively. Moreover, annual downstream GHG emissions were similar to those in the transition/lacustrine zone of the Shuikou reservoir. Diurnal variation observations revealed net CO2 emissions even during algal bloom seasons. The reservoir-downstream river continuum was a year-round source of GHGs (218.5 +/- 18.9 Gg CO2-equivalent yr(-1); CO2 contributed 91%). However, the loss of oxygen also leads to increased production and storage of recalcitrant dissolved organic carbon (RDOC). Thus, identifying mechanisms controlling both GHG emissions and RDOC production is crucial to constrain the carbon neutrality issue of hydroelectric reservoirs in the context of climate change mitigation strategies.
语种	英语
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:001189917900001
来源期刊	LIMNOLOGY AND OCEANOGRAPHY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301162
作者单位	Xiamen University; Xiamen University; Ocean University of China; Ocean University of China; University of California System; University of California Davis; Utrecht University; Xiamen University; Wenzhou University
推荐引用方式 GB/T 7714	Wu, Zetao,Yu, Dan,Yu, Qibiao,et al. Greenhouse gas emissions (CO2-CH4-N2O) along a large reservoir-downstream river continuum: The role of seasonal hypoxia[J],2024,69(5).
APA	Wu, Zetao.,Yu, Dan.,Yu, Qibiao.,Liu, Qian.,Zhang, Mingzhen.,...&Chen, Nengwang.(2024).Greenhouse gas emissions (CO2-CH4-N2O) along a large reservoir-downstream river continuum: The role of seasonal hypoxia.LIMNOLOGY AND OCEANOGRAPHY,69(5).
MLA	Wu, Zetao,et al."Greenhouse gas emissions (CO2-CH4-N2O) along a large reservoir-downstream river continuum: The role of seasonal hypoxia".LIMNOLOGY AND OCEANOGRAPHY 69.5(2024).