Large Methane Emission from the River Inlet Region of Eutrophic Lake: A Case Study of Lake Taihu

Lakes are important natural sources of atmospheric methane (CH4), which should be considered in global CH4 budget estimations. However, the CH4 emissions from lakes can be highly variable, and the emissions from the river inlet region were less studied, which seriously hamper our understanding of CH...

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Bibliographic Details
Published in:Atmosphere 2023-01, Vol.14 (1), p.16
Main Authors: Liao, Yuanshan, Lan, Haijin, Zhang, Xinyue, Liu, Zhenjing, Zhang, Mi, Hu, Zhenghua, Duan, Hongtao, Xiao, Qitao
Format: Article
Language:English
Subjects:
Agricultural production
Algae
Ammonium nitrogen
Aquatic ecosystems
Atmospheric methane
Budgets
CH4 emission
Cold season
Emission analysis
Emissions
eutrophic lake
Eutrophic lakes
Eutrophication
Inlets
Inlets (waterways)
Lakes
Methane
Methane emissions
Nitrogen
Pollutants
Precipitation
river inlet region
River networks
Rivers
seasonal variation
Seasons
Surface water
Temperature dependence
Velocity
Warm seasons
Water pollution
Water temperature
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Summary:Lakes are important natural sources of atmospheric methane (CH4), which should be considered in global CH4 budget estimations. However, the CH4 emissions from lakes can be highly variable, and the emissions from the river inlet region were less studied, which seriously hamper our understanding of CH4 budget estimates of lakes. Here, field measurements from over six years (2012 to 2017) at Lake Taihu, a large eutrophic shallow lake with a complicated river network, were conducted to address the issue. Results show that the river inlet region of the lake was a hot spot of CH4 emission. The CH4 emission at the river inlet region with an annual mean value of 0.183 mmol m−2 d−1 was seven times higher than that at pelagic region (0.028 mmol m−2 d−1). Peak CH4 emission occurred in warm seasons, and the lowest in cold seasons at the pelagic region, but peak emission occurred in cold seasons at the river inlet region. The seasonal CH4 emission at the pelagic region can be explained by water temperature; however, less temperature dependency of CH4 emission at the river inlet region was found. The variability of CH4 emission was linked to pollution loadings, and CH4-rich water in the inflowing river likely sustained the large CH4 emission of river inlet region.
ISSN:2073-4433
2073-4433
DOI:10.3390/atmos14010016