First estimation of the diffusive methane flux and concentrations from Lake Winnipeg, a large, shallow and eutrophic lake
نویسندگان
چکیده
Freshwater lakes are increasingly recognized as significant sources of atmospheric methane (CH4), potentially offsetting the terrestrial carbon sink. We present first study dissolved CH4 distributions and lake-air flux from Lake Winnipeg, based on two-years observations collected during all seasons. Methane concentrations across two years had a median value 24.6 nmol L-1 (mean: 41.6 ± 68.2 L-1) ranged between 5.0 733.8 L-1, with 2018 annual 24.4 46.8 99.3 25.1 38.8 45.2 in 2019. The was 1.1 µmol m−2 h−1 (range: 0.46–70.1 m−2h−1, mean: 2.9 10.2 h−1) 2018, 5.5 m−2h−1 0.0–78.4 h−1, 2.7 8.5 2019, for total diffusive emission 0.001 Tg CH4-C yr−1. found evidence consistent spatial variability, higher near river inflows. Significant seasonal trends were not observed, though fluxes highest fall season due to strong winds. Our findings suggest Winnipeg is source similar mean magnitude Erie, lower per unit area than smaller mid- high-latitude lakes. Additional work needed understand factors underlying observed variability gas concentration, including estimations production consumption rates water column sediments.
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ژورنال
عنوان ژورنال: Journal of Great Lakes Research
سال: 2021
ISSN: ['2773-0719', '0380-1330']
DOI: https://doi.org/10.1016/j.jglr.2021.03.011