Inland Water Greenhouse Gas Budgets for RECCAP2: 2. Regionalization and Homogenization of Estimates
Inland Water Greenhouse Gas Budgets for RECCAP2: 2. Regionalization and Homogenization of Estimates
复制标题
DOI：
10.1029/2022gb007658
复制
发表时间：
2023-04
影响因子：
5.2
通讯作者：
R. Lauerwald;G. Allen;B. Deemer;Shaoda Liu;T. Maavara;P. Raymond;L. Alcott;D. Bastviken;A. Has
中科院分区：
文献类型：
--
作者：
R. Lauerwald;G. Allen;B. Deemer;Shaoda Liu;T. Maavara;P. Raymond;L. Alcott;D. Bastviken;A. Has
内陆沃茨是大气中温室气体（GHG）--二氧化碳（CO2）、甲烷（CH 4）和一氧化二氮（N2 O）--的重要来源。在区域碳循环评估和进程（RECCAP-2）倡议第二阶段的框架内，我们综合了现有的溪流、河流、湖泊和水库的温室气体排放估计，并将其与潜在的全球水面分布图和季节性冰盖的影响进行了同质化。然后，我们在10个广泛的陆地区域产生温室气体排放的区域化估计。根据我们的综合，内陆水域温室气体排放的全球变暖潜力相当于13.5（9.9-20.1）和8.3（5.7-12.7）Pg CO2-eq。分别为20年和100年（GWP 20和GWP 100）。CO2的贡献占GWP 100的主导地位，河流是最大的排放源。对于GWP 20而言，湖泊和河流是同等重要的排放源，CH 4的升温潜能值比CO2更重要。N2 O的贡献大约低两个数量级。标准化到RECCAP-2区域的面积，南美和东南亚显示出最高的排放率，主要是河流CO2排放。
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 second 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 at a 20 and 100 years horizon (GWP20 and GWP100), respectively. Contributions of CO2 dominate GWP100, with rivers being the largest emitter. For GWP20, lakes and rivers are equally important emitters, and the warming potential of CH4 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 emissions.