George H. Allen Bridget R. Deemer Shaoda Liu Taylor Maavara Peter Raymond Lewis Alcott David Bastviken Adam Hastie Meredith A. Holgerson Matthew S. Johnson Bernhard Lehner Peirong Lin Alessandra Marzadri Lishan Ran Hanqin Tian Xiao Yang Yuanzhi Yao Pierre Regnier Ronny Lauerwald 2023 <p>Inland waters are important sources of the greenhouse gasses (GHGs) carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) to the atmosphere. In the framework of the 2^nd<span>&nbsp;</span>phase of the REgional Carbon Cycle Assessment and Processes (RECCAP-2) initiative, we synthesize existing estimates of GHG emissions from streams, rivers, lakes and reservoirs, and homogenize them with regard to underlying global maps of water surface area distribution and the effects of seasonal ice cover. We then produce regionalized estimates of GHG emissions over 10 extensive land regions. According to our synthesis, inland water GHG emissions have a global warming potential of an equivalent emission of 13.5 (9.9-20.1) and 8.3 (5.7-12.7) Pg CO₂-eq. yr^-1<span>&nbsp;</span>at a 20 and 100 year horizon (GWP₂₀<span>&nbsp;</span>and GWP₁₀₀), respectively. Contributions of CO₂<span>&nbsp;</span>dominate GWP₁₀₀, with rivers being the largest emitter. For GWP₂₀, lakes and rivers are equally important emitters, and the warming potential of CH₄<span>&nbsp;</span>is more important than that of CO₂. Contributions from N₂O are about two orders of magnitude lower. Normalized to the area of RECCAP-2 regions, S-America and SE-Asia show the highest emission rates, dominated by riverine CO₂<span>&nbsp;</span>emissions.</p> application/pdf 10.1029/2022GB007658 en American Geophysical Union Inland water greenhouse gas budgets for RECCAP2: 2. Regionalization and homogenization of estimates article