Inland Waters can Act as Nitrous Oxide Sinks: Observation and Modeling Reveal that Nitrous Oxide Undersaturation May Partially Offset Emissions
Inland Waters can Act as Nitrous Oxide Sinks: Observation and Modeling Reveal that Nitrous Oxide Undersaturation May Partially Offset Emissions
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DOI：
10.1029/2023gl104987
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发表时间：
2023-11
影响因子：
5.2
通讯作者：
K. Aho;T. Maavara;K. M. Cawley;P. Raymond
中科院分区：
文献类型：
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作者：
K. Aho;T. Maavara;K. M. Cawley;P. Raymond
内陆水域是一氧化二氮（N2O）的重要天然来源，但高度不确定。许多排放模型假设N2O仅从淡水中排放，而N2O汇行为可以忽略不计。然而，观测研究报告了N2O欠饱和，这表明由于净N2O消耗，内陆水域可以作为N2O汇。本研究利用来自国家生态观测站网络（NEON）的数据和现有的全球排放模型来研究跨尺度和生物群系的溪流、河流和湖泊中N2O欠饱和的患病率和控制措施。我们发现N2O欠饱和在NEON数据集中（14%-30%的样本）和基于过程的模型输出中（38%）普遍存在，发生在生物群系和空间尺度上。如果不考虑NEON数据集中的欠饱和，可能会导致对N2O排放量的高估100%。这些结果表明，要准确估计排放，需要考虑N2O汇的行为。
Inland waters are significant, yet highly uncertain, natural sources of nitrous oxide (N2O). Many emission models assume that N2O is only emitted from freshwaters, and that N2O sink behavior is negligible. However, observational studies have reported N2O undersaturation, suggesting that inland waters can act as N2O sinks due to net N2O consumption. This study leverages data from the National Ecological Observatory Network (NEON) and an existing global emission model to examine the prevalence of and controls on N2O undersaturation in streams, rivers, and lakes across scales and biomes. We find that N2O undersaturation is prevalent in the NEON data set (14%–30% of samples) and process‐based model outputs (38%), occurring across biomes and spatial scales. Failing to account for undersaturation in the NEON data set could result in an 100% overestimation of N2O emissions. These results show that consideration of N2O sink behavior is needed for accurate emission estimates.