Strong Subseasonal Variability of Oxic Methane Production Challenges Methane Budgeting in Freshwater Lakes

被引:0
|
作者
Liu, Liu [1 ,2 ]
Zhang, Xin [3 ,4 ]
Schorn, Sina [5 ]
Doda, Tomy [4 ,6 ]
Kang, Manchun [7 ]
Bouffard, Damien [4 ,6 ]
Kirillin, Georgiy [8 ]
Milucka, Jana [5 ]
Shi, Xiaotao [9 ]
Grossart, Hans-Peter [2 ,10 ]
机构
[1] Yunnan Normal Univ, Fac Geog, Yunnan Key Lab Plateau Geog Proc & Environm Change, Kunming 650500, Peoples R China
[2] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Plankton & Microbial Ecol, D-16775 Stechlin, Germany
[3] Minist Emergency Management China, Natl Inst Nat Hazards, Beijing 100085, Peoples R China
[4] Eawag Swiss Fed Inst Aquat Sci & Technol, Surface Waters Res & Management, CH-6047 Kastanienbaum, Switzerland
[5] Max Planck Inst Marine Microbiol, Dept Biogeochem, D-28359 Bremen, Germany
[6] Univ Lausanne, Inst Earth Surface Dynam, Fac Geosci & Environm, Geopolis, CH-1015 Lausanne, Switzerland
[7] Engn Res Ctr Ecoenvironm Three Gorges Reservoir Re, Yichang 443002, Peoples R China
[8] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Ecohydrol & Biogeochem, D-12587 Berlin, Germany
[9] Hubei Int Sci & Technol Cooperat Base Fish Passage, Yichang 443002, Peoples R China
[10] Potsdam Univ, Inst Biochem & Biol, D-14476 Potsdam, Germany
基金
中国国家自然科学基金;
关键词
carbon cycling; greenhouse gases; methane paradox; physical transport; hydrodynamic model; freshwaterlakes; IN-SITU METHANOGENESIS; SURFACE-WATER; PARADOX; FLUX; EMISSIONS; TRANSPORT; OXIDATION; CH4;
D O I
10.1021/acs.est.4c07413
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Methane (CH4) accumulation in the well-oxygenated lake epilimnion enhances the diffusive atmospheric CH4 emission. Both lateral transport and in situ oxic methane production (OMP) have been suggested as potential sources. While the latter has been recently supported by increasing evidence, quantifying the exact contribution of OMP to atmospheric emissions remains challenging. Based on a large high-resolution field data set collected during 2019-2020 in the deep stratified Lake Stechlin and on three-dimensional hydrodynamic modeling, we improved existing CH4 budgets by resolving each component of the mass balance model at a seasonal scale and therefore better constrained the residual OMP. All terms in our model showed a large temporal variability at scales from intraday to seasonal, and the modeled OMP was most sensitive to the surface CH4 flux estimates. Future efforts are needed to reduce the uncertainties in estimating OMP rates using the mass balance approach by increasing the frequency of atmospheric CH4 flux measurements.
引用
收藏
页码:19690 / 19701
页数:12
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