Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 126, Issue 4, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JG005828
Keywords
methane storage; Philippine lakes; tropics
Funding
- Department of Science and Technology - Accelerated Science and Technology Human Resource Development Program Scholarship
- Bilateral Programs of the Japan Society for the Promotion of Science [JPJSBP120208602]
- Japan Society for the Promotion of Science [24405007, 16H05774]
- Research Institute for Humanity and Nature Project [D0614200119, 18H02238]
- Grants-in-Aid for Scientific Research [16H05774, 24405007] Funding Source: KAKEN
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This study found that deeper lakes store higher concentrations of CH4, while shallow lakes exhibit vertical mixing and transport of CH4. The average CH4 concentrations are influenced by depth and weather factors, with no apparent effect of daily weather parameters on CH4 concentrations below 30 meters depth in deep lakes.
To understand methane (CH4) dynamics in tropical lakes and describe their importance in overall CH4 emissions, we observed temporal trends of CH4 stored in the water columns of Philippine lakes of different depths (shallow, moderately deep, and deep). We detected higher CH4 stored in profundal anoxic layers of deeper lakes. The average surface and profundal CH4 concentrations throughout our monthly monitoring were 0.27 +/- 0.07 and 421 +/- 189 mu mol L-1 in the shallow lake, 0.48 +/- 0.37 and 1,121 +/- 125 mu mol L-1 in the moderately deep lake, and 0.34 +/- 0.23 and 943 +/- 119 mu mol L-1 in the deep lake. The fate of CH4 stored in the water column was related to depth, owing to different stratification and mixing regimes. Analyses of temporal relationships of CH4 with daily weather and physicochemical parameters revealed their impact on CH4 dynamics by controlling the frequency and mixing intensity throughout the year. Only shallow lake exhibited increase in CH4 concentrations with lowering atmospheric pressure. This allows vertical mixing and transport of CH4 from deeper to shallower layers. In moderately deep, and deep lakes, effects of daily weather parameters were not apparent on CH4 concentrations in the deepest layers (below 30 m depth). This suggests that lake depth and stratification should be considered for precise estimation of tropical lakes' CH4 emissions. Comparison with lakes under different climate conditions revealed the importance of tropical lakes for surface CH4 emission due to higher surface CH4 concentrations. Changes in water temperature is one of the factors controlling profundal CH4 production, storage, and its transport to shallower layer.
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