Drainage Ditches (“Hot Spots”) and Storms (“Hot Moments”) Define Aquatic Greenhouse Gas (CO 2 , CH 4 , N 2 O) Emissions From the Land‐to‐Ocean Aquatic Continuum

作者：Naomi S. Wells, Mustefa Yasin Reshid, Karl Hennig, Matthew R. Hipsey, Peisheng Huang, Bradley D. Eyre · 发表于：Geophysical Research Letters · 年份：2025 · DOI：10.1029/2024gl113326 · 被引用次数：8 · 研究领域：Marine and coastal ecosystems、Coastal wetland ecosystem dynamics、Oceanographic and Atmospheric Processes

Abstract Humans are altering coastal regions directly (land‐use, drainage) and indirectly (climate change). Alterations potentially create positive climate feedback loops by enhancing production and emission of aquatic greenhouse gases (GHGs) CO 2 , N 2 O, and CH 4 . We tested this hypothesis by measuring dissolved CO 2 , N 2 O, and CH 4 concentrations across the anthropogenic aquatic continuum (farm ponds, ditches, irrigation drains, streams, tidal rivers, and estuaries) and continuously during a winter storm. Combining measurements with hydrodynamic modeling enabled us to parameterize physical gas transfer uncertainties, revealing artificial waterways contributed disproportionately to emissions. Ditches and drains cover 5% of water surface area but produced >50% of emissions (2–11 Mmol d −1 CO 2 ‐equivalents). But storms inverted this pattern by increasing estuary emissions 16‐fold (5.0 Mmol d −1 CO 2 ‐equivalent), suggesting storm patterns could control both sources and magnitudes of aquatic GHG emissions. Findings show overlooked artificial drains and hard‐to‐measure storms will increasingly define the aquatic offsets of landscape carbon budgets.