干旱区生态环境知识资源中心(Arid): Undervalued dry riverbeds: A key factor in equating intermittent river CO2 emissions to perennial rivers

Arid

DOI	10.1016/j.watres.2024.121859
	Undervalued dry riverbeds: A key factor in equating intermittent river CO2 emissions to perennial rivers
	Qin, Chao; Xue, Yuan; Xu, Mengzhen; Ran, Lishan; Li, Dongfeng; Wang, Ge; Cun, Defan; Wu, Baosheng; Fu, Xudong; Wang, Guangqian
通讯作者	Xue, Y
来源期刊	WATER RESEARCH
ISSN	0043-1354
EISSN	1879-2448
出版年	2024
卷号	259
英文摘要	Intermittent rivers in semiarid and arid regions, constituting over half of the world's rivers, alternate the carbon cycle interactions among the biosphere, hydrosphere, and atmosphere. Inadequate quantification of flow duration and river water surface area, along with overlooked CO2 emissions from dry riverbeds, result in notable inaccuracies in global carbon cycle assessments. High-resolution remote sensing images combined with intensive field measurements and hydrological modelling were used to estimate and extract the flow duration, river water surface area and dry riverbed area of Huangfuchuan, an intermittent river watershed that acts as a major tributary of the Yellow River in semiarid Northwest China. CO2 emission rates and partial pressures in water and air across the watershed were in-situ measured. In 2018, the flow duration of Huangfuchuan increased from less than 5 days in the first-order tributary to 150 days in the sixth-order mainstream. River water surface area estimated by remote sensing extraction plus the hydrodynamic model simulation varied from 3.9 to 88.6 km2 under 5 %-95 % discharge frequencies. CO2 emissions from the water-air interface and dry riverbed in 2018 were estimated at 582.3 x 103 and 355.2 x 103 ton, respectively. The estimated total annual emission (937.5 x 103 ton) aligns closely with the range of emissions (67.3 x 103-1377.2 x 103 ton) calculated for the water-air interface alone, derived using DEM river length and hydraulic geometry method. This similarity can be attributed to the overestimation of flow duration and flow velocity, as well as the over- or under-estimation of river water surface area and slope. The new method proposed in this study has large potential to be applied in estimating CO2 emissions from data-scarce intermittent rivers located in mountainous regions and provides a standardized solution in the estimation of CO2 emission. Results of this research reveal the spatiotemporal distribution of CO2 emissions along an intermittent river system and highlight the substantial role of dry riverbed in carbon cycle.
英文关键词	CO 2 emission Mountainous river Intermittent river River surface extraction Flow duration
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001256282000001
WOS关键词	GREENHOUSE-GAS EMISSIONS ; CARBON-DIOXIDE EMISSIONS ; INLAND WATERS ; METABOLISM ; SIMULATION ; CATCHMENT ; NETWORK ; BASIN ; CYCLE ; DAMS
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405916
推荐引用方式 GB/T 7714	Qin, Chao,Xue, Yuan,Xu, Mengzhen,et al. Undervalued dry riverbeds: A key factor in equating intermittent river CO2 emissions to perennial rivers[J],2024,259.
APA	Qin, Chao.,Xue, Yuan.,Xu, Mengzhen.,Ran, Lishan.,Li, Dongfeng.,...&Wang, Guangqian.(2024).Undervalued dry riverbeds: A key factor in equating intermittent river CO2 emissions to perennial rivers.WATER RESEARCH,259.
MLA	Qin, Chao,et al."Undervalued dry riverbeds: A key factor in equating intermittent river CO2 emissions to perennial rivers".WATER RESEARCH 259(2024).