Influence of Vertical Hydrologic Exchange Flow, Channel Flow, and Biogeochemical Kinetics on CH4 Emissions From Rivers

Chen，Kewei1; Yang，Shuai1,2; Roden，Eric E.3; Chen，Xingyuan4; Chang，Kuang Yu5; Guo，Zhilin1; Liang，Xiuyu1; Ma，Enze1; Fan，Linfeng1; Zheng，Chunmiao1,6

2023-12-01

10.1029/2023WR035341

Water Resources Research   影响因子和分区

0043-1397

1944-7973

CH emissions from inland water are highly uncertain in the current global CH budget, especially for rivers and streams due to sparse measurements and the uncertainty of measurements caused by turbulent water flow. A previous study has revealed that vertical hydrologic exchange flow (VHEF) is the main regulator of CH emissions from riverbed sediments. However, to what extent the understanding obtained from the plot-scale can be extended to the reach scale and basin scale remains unknown. To address this challenge, we developed a process-based model to estimate CH flux at the air-water interface using the attributes available in the national hydrography data set. It calculates the annual mean flux of VHEF, CH production in sediments, and CH transport in the river channel in a sequential manner. Model performance is evaluated by CH efflux observed at the Hanford reach of the Columbia River. We show that reach-wise sediment hydrologic and biogeochemical conditions estimated from the national hydrography data set could serve as a good indicator of CH emissions from rivers. Aerobic methane oxidation and export to the downstream are the dominant ways of total CH loss for the large lowland river. The hotspots of CH emissions are likely to be at the reaches with fine sediments and slow channel velocity. This study demonstrates the possibility of quantifying CH emissions at the reach scale and the modeling framework has the potential to be extended to the basin scale to improve estimates of CH emissions from lotic inland water.

biogeochemistry hyporheic zone riverine methane surface water-groundwater interaction

SCI ; EI

英语

第一 ; 通讯

WOS:001114765700001

20235015190103

Air ; Biogeochemistry ; Budget control ; Flow of water ; Groundwater ; Hydrology ; Methane ; Mixing ; Navigation ; Phase interfaces ; Sediments ; Uncertainty analysis

Groundwater:444.2 ; Geochemistry:481.2 ; Soil Mechanics and Foundations:483 ; Liquid Dynamics:631.1.1 ; Biochemistry:801.2 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Probability Theory:922.1

ENVIRONMENT/ECOLOGY

2-s2.0-85178951187

Scopus

1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.Institute of Water Science,College of Engineering,Peking University,Beijing,China
3.Department of Geoscience,University of Wisconsin,Madison,United States
4.Pacific Northwest National Laboratory,Richland,United States
5.Climate and Ecosystem Sciences Division,Lawrence Berkeley National Laboratory,Berkeley,United States
6.Eastern Institute for Advanced Study,Eastern Institute of Technology,Ningbo,China

Chen，Kewei,Yang，Shuai,Roden，Eric E.,et al. Influence of Vertical Hydrologic Exchange Flow, Channel Flow, and Biogeochemical Kinetics on CH4 Emissions From Rivers[J]. Water Resources Research,2023,59(12).

Chen，Kewei.,Yang，Shuai.,Roden，Eric E..,Chen，Xingyuan.,Chang，Kuang Yu.,...&Zheng，Chunmiao.(2023).Influence of Vertical Hydrologic Exchange Flow, Channel Flow, and Biogeochemical Kinetics on CH4 Emissions From Rivers.Water Resources Research,59(12).

Chen，Kewei,et al."Influence of Vertical Hydrologic Exchange Flow, Channel Flow, and Biogeochemical Kinetics on CH4 Emissions From Rivers".Water Resources Research 59.12(2023).