Microbial methane oxidation efficiency and robustness during lake overturn

被引：15

作者：

Zimmermann, M. ^{[1
,2
]}

Mayr, M. J. ^{[1
,2
]}

Burgmann, H. ^{[1
]}

Eugster, W. ^{[2
]}

Steinsberger, T. ^{[1
]}

Wehrli, B. ^{[1
,2
]}

Brand, A. ^{[1
,3
]}

Bouffard, D. ^{[1
]}

机构：

[1] Swiss Fed Inst Aquat Sci & Technol Surface Waters, Eawag, Kastanienbaum, Switzerland

[2] Swiss Fed Inst Technol, Dept Environm Syst Sci, Zurich, Switzerland

[3] Furkastr 75, CH-3904 Naters, Switzerland

来源：

LIMNOLOGY AND OCEANOGRAPHY LETTERS | 2021年 / 6卷 / 06期

基金：

瑞士国家科学基金会;

关键词：

EDDY COVARIANCE; GROWTH YIELDS; EMISSIONS; METHANOTROPHS; KINETICS; CARBON; EBULLITION; VOLUME; MODEL; FLUX;

D O I：

10.1002/lol2.10209

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Many seasonally stratified lakes accumulate substantial amounts of the greenhouse gas methane in the anoxic zone. Methane oxidizing bacteria in the water column act as a converter, oxidizing methane into carbon dioxide and biomass before it reaches the atmosphere. Current observations and estimates of this methane oxidation efficiency are diverging, especially for the lake overturn period. Here, we combine a model of turbulent mixing, gas exchange, and microbial growth with a comprehensive data set for autumn mixing to quantify the relevant physical and microbial processes for a 16 m deep, wind-sheltered Swiss lake. Scenario analysis suggests that the methane converter is efficient and robust under a large range of mixing velocities and only rare events of pronounced surface cooling can trigger substantial outgassing. This case study combines in situ observation and a deterministic physically based model and suggests that the frequency of storms may strongly impact methane emissions for similar temperate lakes.

引用

页码：320 / 328

页数：9

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