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Controlling Factors of Methane in Tropical Lakes of Different Depths
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2021-02-25 , DOI: 10.1029/2020jg005828
Milette U. Mendoza‐Pascual 1, 2 , Masayuki Itoh 3 , Jaydan I. Aguilar 1 , Karol Sophia Agape R. Padilla 1 , Rey Donne S. Papa 1, 4, 5 , Noboru Okuda 6, 7
Affiliation  

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 μmol L–1 in the shallow lake, 0.48 ± 0.37 and 1,121 ± 125 μmol L–1 in the moderately deep lake, and 0.34 ± 0.23 and 943 ± 119 μmol 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.

中文翻译:

不同深度热带湖泊甲烷的控制因素

为了了解热带湖泊中甲烷(CH 4)的动态并描述其在整体CH 4排放中的重要性,我们观察了不同深度(浅,中度深和深)菲律宾湖泊水柱中存储的CH 4的时空趋势。我们检测到较高的CH 4储存在更深的湖泊的深层缺氧层中。平均表面和深水CH 4种在我们的每月监测浓度分别为0.27±0.07和421±189微摩尔大号-1在浅湖,0.48±0.37和1121±125微摩尔大号-1在适度深湖,和0.34±0.23在深湖中为943±119μmolL –1。CH 4的命运由于不同的分层和混合方式,存储在水柱中的水与深度有关。对CH 4与日常天气和理化参数的时间关系的分析揭示了它们通过控制全年的频率和混合强度对CH 4动态的影响。只有浅湖在大气压力降低的情况下显示出CH 4浓度的增加。这允许CH 4从较深层到较浅层的垂直混合和传输。在中等深度和深水湖泊中,每日天气参数对CH 4的影响不明显最深层(低于30 m的深度)中的浓度。这表明应该考虑湖泊的深度和分层,以精确估算热带湖泊的CH 4排放量。与不同气候条件下的湖泊进行比较后发现,由于较高的地表CH 4浓度,热带湖泊对于地表CH 4排放的重要性。水温的变化是控制深层CH 4产生,存储及其向浅层输送的因素之一。
更新日期:2021-04-08
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