Anthropogenic Perturbations Complicated the Downstream Greenhouse Gas Dynamics of a Large Subtropical Reservoir DOI
Xiang Wan,

Shuai Chen,

Wanfa Wang

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(12)

Published: Dec. 1, 2024

Abstract River damming can significantly alter the hydrology and nutrient levels of river water, resulting in substantial greenhouse gas (GHG) emissions to atmosphere. However, dynamics gases discharged water downstream dams remain poorly understood, despite being recognized as a crucial source GHG river‐reservoir systems. In this study, we conducted comprehensive measurements concentrations chemistry large subtropical reservoir its upstream rivers investigate spatiotemporal patterns fluxes identify their governing mechanisms, with primary focus on dynamics. Our analysis revealed that distribution p CO 2 among was predominantly controlled by aquatic metabolism atmospheric exchange. Conversely, CH 4 N O largely influenced anaerobic metabolism. Seasonal fluctuations were linked hydroclimatic conditions, including temperature, hydrologic connectivity between land rivers, thermal stratification. Anthropogenic activities (e.g., agricultural use) found affect trend concentrations. Higher compared attributed production increased transfer velocity rivers. These findings underscore critical influence anthropogenic emphasize necessity integrating impacts seasonal variability enhance our understanding carbon budget

Language: Английский

How do varying nitrogen fertilization rates affect crop yields and riverine N2O emissions? A hybrid modeling study DOI
Diego Panique-Casso,

Nelson F Pacheco-Bueno,

Marie Anne Eurie Forio

et al.

Water Research, Journal Year: 2025, Volume and Issue: 276, P. 123242 - 123242

Published: Feb. 3, 2025

Language: Английский

Citations

0
Isotopic Constraints on Nitrous Oxide Emissions From the US Corn Belt DOI Creative Commons
Timothy J. Griffis, Zhen Yu, John M. Baker

et al.

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(21)

Published: Nov. 6, 2024

Abstract Agriculture is the dominant source of anthropogenic nitrous oxide (N 2 O) –a greenhouse gas and a stratospheric ozone depleting substance. The US Corn Belt large global N O source, but there remain uncertainties regarding its attribution biogeochemical pathways. Here, we interpret high frequency stable isotope observations from very tall tower to improve our understanding regional attribution. We detected significant seasonal variability in δ 15 bulk (6.47–7.33‰) site preference (δ SP = α –δ β , 18.22–25.19‰) indicating predominance denitrification during growing period nitrification snowmelt period. Isotope mixing models atmospheric inversions both indicate that indirect emissions contribute substantially (>35%) total emissions. Despite relatively uncertainties, upper bound bottom‐up emission estimates are at lower isotopic constraint, implying discrepancies require further investigation.

Language: Английский

Citations

1
Combining stable isotopes and spatial stream network modelling to disentangle the roles of hydrological and biogeochemical processes on riverine nitrogen dynamics DOI Creative Commons
Minpeng Hu, Zhongjie Yu, Timothy J. Griffis

et al.

Water Research, Journal Year: 2024, Volume and Issue: 269, P. 122800 - 122800

Published: Nov. 15, 2024

Intensive agricultural activities have significantly altered watershed hydrological and biogeochemical processes, resulting in water quality issues loss of ecosystem functions biodiversity. A major challenge effectively mitigating nitrogen (N) from watersheds stems the heterogeneity N transformation transport processes that complicates accurate quantification modeling sources sinks at scale. This study utilized stable isotopes nitrate (NO

Language: Английский

Citations

1
Investigating the impact of watershed and local environmental variables on the spatial distribution, composition and functional diversity of benthic algal communities in the upper Red River Basin, China DOI

HE Ke-jian,

Xuekai Feng,

Changming Chen

et al.

Aquatic Sciences, Journal Year: 2024, Volume and Issue: 86(4)

Published: Aug. 12, 2024

Language: Английский

Citations

1
Anthropogenic Perturbations Complicated the Downstream Greenhouse Gas Dynamics of a Large Subtropical Reservoir DOI
Xiang Wan,

Shuai Chen,

Wanfa Wang

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(12)

Published: Dec. 1, 2024

Abstract River damming can significantly alter the hydrology and nutrient levels of river water, resulting in substantial greenhouse gas (GHG) emissions to atmosphere. However, dynamics gases discharged water downstream dams remain poorly understood, despite being recognized as a crucial source GHG river‐reservoir systems. In this study, we conducted comprehensive measurements concentrations chemistry large subtropical reservoir its upstream rivers investigate spatiotemporal patterns fluxes identify their governing mechanisms, with primary focus on dynamics. Our analysis revealed that distribution p CO 2 among was predominantly controlled by aquatic metabolism atmospheric exchange. Conversely, CH 4 N O largely influenced anaerobic metabolism. Seasonal fluctuations were linked hydroclimatic conditions, including temperature, hydrologic connectivity between land rivers, thermal stratification. Anthropogenic activities (e.g., agricultural use) found affect trend concentrations. Higher compared attributed production increased transfer velocity rivers. These findings underscore critical influence anthropogenic emphasize necessity integrating impacts seasonal variability enhance our understanding carbon budget

Language: Английский

Citations

0