气候变化领域集成服务门户(CCPortal): Enhanced Role of Streamflow Processes in the Evolutionary Trends of Dissolved Organic Carbon

CCPortal

DOI	10.1021/acs.est.3c09508
	Enhanced Role of Streamflow Processes in the Evolutionary Trends of Dissolved Organic Carbon
	Wu, Jiefeng; Yao, Huaxia
发表日期	2024
ISSN	0013-936X
EISSN	1520-5851
起始页码	58
结束页码	10
卷号	58 期号:10
英文摘要	Investigating dissolved organic carbon (DOC) dynamics and drivers in rivers enhances the understanding of carbon-environment linkages and support sustainability. Previous studies did not fully consider the dynamic nature of key drivers that influence the long-term changing trends in DOC concentration over time (the controlling factors and their roles in DOC trend can undergo alterations over time). We analyzed 42 years (1979-2018) of hydrometeorology, sulfate SO4, and DOC data from a 5.42 km(2) watershed in central-southern Ontario, Canada. Our findings reveal a significant (p <= 0.01) overall increase in DOC concentrations, mainly due to the coevolution of SO4 and streamflow trends, especially the extreme flows. Over the 42-year period, the changing trend of streamflow (especially the extreme high or low flows) have significantly (p < 0.05) intensified their influence on DOC trends, increasing by an average of 30%. Conversely, the impact of SO4 has weakened, experiencing an average decrease of 32.6%. The upward trend in the annual average DOC concentration is attributed to the increasing number of maximum flow days within a year, while the decreasing trend in the number of minimum flow days has a contrasting effect. In other words, changes in maximum and minimum flow days have a counteracting effect on the DOC concentration trends. These results underscore the importance of considering the effects of altered streamflow processes on carbon cycle changes under evolving environmental conditions.
英文关键词	DOC; trends; streamflow; SO4; coevolution; extremes
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology
WOS类目	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:001179262700001
来源期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/296939
作者单位	Nanjing University of Information Science & Technology; Nanjing University of Information Science & Technology
推荐引用方式 GB/T 7714	Wu, Jiefeng,Yao, Huaxia. Enhanced Role of Streamflow Processes in the Evolutionary Trends of Dissolved Organic Carbon[J],2024,58(10).
APA	Wu, Jiefeng,&Yao, Huaxia.(2024).Enhanced Role of Streamflow Processes in the Evolutionary Trends of Dissolved Organic Carbon.ENVIRONMENTAL SCIENCE & TECHNOLOGY,58(10).
MLA	Wu, Jiefeng,et al."Enhanced Role of Streamflow Processes in the Evolutionary Trends of Dissolved Organic Carbon".ENVIRONMENTAL SCIENCE & TECHNOLOGY 58.10(2024).