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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
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Salinity decreases methane concentrations in Chinese lakes.

Hu Liu1, Shangbin Xiao2, Weiguo Liu3

  • 1State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China; Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China.

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PubMed
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Salinity significantly impacts lake methane (CH4) emissions. Freshwater lakes emit more methane than saline lakes, a key finding for global CH4 emission estimates.

Keywords:
CH(4) concentrationFreshwater lakeSaline lakeSalinity

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Limnology

Background:

  • Lakes are significant sources of atmospheric methane (CH4).
  • Accurate assessment of CH4 emissions requires understanding environmental influences on lake water CH4 concentrations.
  • Salinity is a critical, yet often overlooked, environmental factor in aquatic methane cycling.

Purpose of the Study:

  • To investigate the influence of salinity on methane (CH4) concentrations in lake water.
  • To compare CH4 concentrations between freshwater and saline lakes in the Tibetan Plateau and other regions of China.
  • To provide insights for more accurate global CH4 emission estimations from lakes.

Main Methods:

  • In-situ continuous measurements of CH4 concentration in Lake Keluke (freshwater) and Lake Tuosu (saline) from 2021-2023.
  • Analysis of spatial and seasonal variations in CH4 concentrations.
  • Comparative analysis of CH4 concentrations across 33 lakes (5 saline, 28 freshwater) representing diverse geographical regions.

Main Results:

  • Methane (CH4) concentrations exhibited substantial spatial and seasonal variations in both studied lakes.
  • CH4 concentrations were consistently higher in the freshwater Lake Keluke compared to the saline Lake Tuosu.
  • Saline lakes across different regions showed significantly lower average CH4 concentrations (0.08 μmol/L) than freshwater lakes (1.25 μmol/L).

Conclusions:

  • Salinity is a critical factor controlling CH4 concentrations in lake water, likely through microbial community shifts.
  • Freshwater and saline lakes exhibit distinct CH4 emission profiles.
  • The findings support differentiating lake types for improved global CH4 emission modeling.