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Inland water greenhouse gas budgets for RECCAP2: 2 Regionalization and homogenization of estimates following the RECCAP2 framework

Global biogeochemical cycles, 2023, Vol.37 (5) [Peer Reviewed Journal]

Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0886-6236 ;EISSN: 1944-9224 ;DOI: 10.1029/2022GB007658

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  • Title:
    Inland water greenhouse gas budgets for RECCAP2: 2 Regionalization and homogenization of estimates following the RECCAP2 framework
  • Author: Lauerwald, Ronny ; Allen, George ; Deemer, Bridget ; Liu, Shaoda ; Maavara, Taylor ; Raymond, Peter ; Alcott, Lewis ; Bastviken, David ; Hastie, Adam ; Holgerson, Meredith ; Johnson, Matthew ; Lehner, Bernhard ; Lin, Peirong ; Marzadri, Alessandra ; Ran, Lishan ; Tian, Hanqin ; Yang, Xiao ; Yao, Yuanzhi ; Regnier, Pierre
  • Subjects: Environmental Sciences
  • Is Part Of: Global biogeochemical cycles, 2023, Vol.37 (5)
  • Description: 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 2nd 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 13.6 (10.0-20.3) and 8.3 (5.8-12.7) Pg CO2-eq. yr-1 at a 20 and 100 year 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.
  • Publisher: American Geophysical Union
  • Language: English
  • Identifier: ISSN: 0886-6236
    EISSN: 1944-9224
    DOI: 10.1029/2022GB007658
  • Source: Hyper Article en Ligne (HAL) (Open Access)
    Wiley Blackwell AGU Digital Library
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