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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Effects of Wind and Buoyancy on Carbon Dioxide Distribution and Air-Water Flux of a Stratified Temperate Lake
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Effects of Wind and Buoyancy on Carbon Dioxide Distribution and Air-Water Flux of a Stratified Temperate Lake

机译：风力与浮力对分层温带湖二氧化碳分布及空水通量的影响

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Improved calculations of emissions of greenhouse gases from stratified lakes require understanding the physical processes controlling transport of dissolved gases to the air-water interface on diel, synoptic, and seasonal time scales. We address this issue during the transition from late summer to autumn cooling in a small temperate lake by combining micrometeorology, physical limnology, and carbon dioxide (CO_2) measurements throughout the water column. Over the 26-day campaign, the lake cooled and emitted CO_2 with daily average loss of 23 mmol CO_2 m~(-2) d~(-1). Over diel cycles, lake surface pCO_2 decreased during daytime heating and increased during nighttime cooling, while daytime CO_2 fluxes exceeded nighttime fluxes by 35% due to higher daytime wind speeds. We compared the effects of diel and synoptic weather patterns on the CO_2 distribution within the lake and lake-atmosphere CO_2 flux. Increases in near-surface pCO_2 scaled with stratification and heat loss which moderated transport of dissolved gases into the mixed layer. When winds were above ~4 m s~(-1), lake-scale circulations drove upwelling and downwelling that redistributed heat and carbon dioxide between the northeast and southwest basins. Short-burst peak CO_2 fluxes exceeded 50 mmol m~(-2) d~(-1) during windy periods associated with storms. However, the seasonal cooling-induced transition to persistent deep mixing led to the highest CO_2 concentrations in the mixed layer and at the surface and the highest sustained CO_2 fluxes (approaching 100 mmol m~(-2) d~(-1)).
机译：改进了分层湖泊的温室气体排放的计算需要了解控制溶解气体运输到DIEL，SYNOIPTIC和季节性时间尺度的空气界面的物理过程。通过在整个水柱中结合微观气象，物理湖泊学和二氧化碳（CO_2）测量，在从夏季到夏天到秋季冷却过程中的秋季冷却过程中的出现问题。在26天的活动中，湖泊冷却并发出了CO_2，每日平均损失23 mmol CO_2 m〜（-2）d〜（-1）。通过Diel循环，湖面PCO_2在白天加热期间减少，夜间冷却期间增加，而日间CO_2助焊剂由于更高的日间风速，白天CO_2通量超过35％的夜间通量。我们比较了DIEL和揭练天气模式对湖泊和湖气氛CO_2通量的CO_2分布的影响。近表面PCO_2增加，其分层和热损失，其调节溶解气体进入混合层。当风高于〜4米S〜（-1）时，湖泊级循环推动了升高和沉船，可在东北和西南盆地之间重新分配和二氧化碳。与风暴相关的有风时段，短脉冲峰CO_2助熔剂超过50mmol m〜（-2）d〜（-1）。然而，季节性冷却诱导的过渡到持续深混合的过渡导致混合层中的最高CO_2浓度和表面和最高持续的CO_2助熔剂（接近100mmol m〜（-2）d〜（-1））。

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