High Intra‐Seasonal Variability in Greenhouse Gas Emissions From Temperate Constructed Ponds
High Intra‐Seasonal Variability in Greenhouse Gas Emissions From Temperate Constructed Ponds
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DOI：
10.1029/2023gl104235
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发表时间：
2023-09
影响因子：
5.2
通讯作者：
Nicholas E. Ray;M. A. Holgerson
中科院分区：
文献类型：
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作者：
Nicholas E. Ray;M. A. Holgerson
内陆沃茨在全球温室气体预算中发挥着重要作用。这些系统中最小的（即，池塘）在全球范围内的排放足迹特别大，但限制很差。这种不确定性在很大程度上是由于对排放量的时间变化缺乏了解。在这里，我们进行了高分辨率的时间采样，以量化四个温带建造池塘和大气之间的温室气体交换。我们发现，这些池塘是大气中温室气体的净来源（564.4 g CO2-eq m-2 yr-1），由高度随时间变化的扩散甲烷（CH 4）排放驱动。扩散CH 4释放到大气中的两倍高的时期时，池塘有一个分层的水柱比当它是混合的。沸腾的CH 4释放也较高，在分层。因此，建造池塘以支持混合条件，为最大限度地减少未来池塘建设的全球温室气体足迹提供了机会。
Inland waters play a major role in global greenhouse gas (GHG) budgets. The smallest of these systems (i.e., ponds) have a particularly large—but poorly constrained—emissions footprint at the global scale. Much of this uncertainty is due to a poor understanding of temporal variability in emissions. Here, we conducted high‐resolution temporal sampling to quantify GHG exchange between four temperate constructed ponds and the atmosphere on an annual basis. We show these ponds are a net source of GHGs to the atmosphere (564.4 g CO2‐eq m−2 yr−1), driven by highly temporally variable diffusive methane (CH4) emissions. Diffusive CH4 release to the atmosphere was twice as high during periods when the ponds had a stratified water column than when it was mixed. Ebullitive CH4 release was also higher during stratification. Building ponds to favor mixed conditions thus presents an opportunity to minimize the global GHG footprint of future pond construction.