TY - JOUR
T1 - Cross-continental importance of CH4 emissions from dry inland-waters
AU - Paranaíba, José R.
AU - Aben, Ralf
AU - Barros, Nathan
AU - Quadra, Gabrielle
AU - Linkhorst, Annika
AU - Amado, André M.
AU - Brothers, Soren
AU - Catalán, Núria
AU - Condon, Jason
AU - Finlayson, Colin M.
AU - Grossart, Hans-Peter
AU - Howitt, Julia
AU - Oliveira Junior, Ernandes S.
AU - Keller, Philipp S.
AU - Koschorreck, Matthias
AU - Laas, Alo
AU - Leigh, Catherine
AU - Marcé, Rafael
AU - Mendonça, Raquel
AU - Muniz, Claumir C.
AU - Obrador, Biel
AU - Onandia, Gabriela
AU - Raymundo, Diego
AU - Reverey, Florian
AU - Roland, Fábio
AU - Rõõm, Eva Ingrid
AU - Sobek, Sebastian
AU - von Schiller, Daniel
AU - Wang, Haijun
AU - Kosten, Sarian
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
Copyright © 2021 Elsevier B.V. All rights reserved.
PY - 2022/3/25
Y1 - 2022/3/25
N2 - Despite substantial advances in quantifying greenhouse gas (GHG) emissions from dry inland waters, existing estimates mainly consist of carbon dioxide (CO2) emissions. However, methane (CH4) may also be relevant due to its higher Global Warming Potential (GWP). We report CH4 emissions from dry inland water sediments to i) provide a cross-continental estimate of such emissions for different types of aquatic systems (i.e., lakes, ponds, reservoirs, and streams) and climate zones (i.e., tropical, continental, and temperate); and ii) determine the environmental factors that control these emissions. CH4 emissions from dry inland waters were consistently higher than emissions observed in adjacent uphill soils, across climate zones and in all aquatic systems except for streams. However, the CH4 contribution (normalized to CO2 equivalents; CO2-eq) to the total GHG emissions of dry inland waters was similar for all types of aquatic systems and varied from 10 to 21%. Although we discuss multiple controlling factors, dry inland water CH4 emissions were most strongly related to sediment organic matter content and moisture. Summing CO2 and CH4 emissions revealed a cross-continental average emission of 9.6 ± 17.4 g CO2-eq m−2 d−1 from dry inland waters. We argue that increasing droughts likely expand the worldwide surface area of atmosphere-exposed aquatic sediments, thereby increasing global dry inland water CH4 emissions. Hence, CH4 cannot be ignored if we want to fully understand the carbon (C) cycle of dry sediments.
AB - Despite substantial advances in quantifying greenhouse gas (GHG) emissions from dry inland waters, existing estimates mainly consist of carbon dioxide (CO2) emissions. However, methane (CH4) may also be relevant due to its higher Global Warming Potential (GWP). We report CH4 emissions from dry inland water sediments to i) provide a cross-continental estimate of such emissions for different types of aquatic systems (i.e., lakes, ponds, reservoirs, and streams) and climate zones (i.e., tropical, continental, and temperate); and ii) determine the environmental factors that control these emissions. CH4 emissions from dry inland waters were consistently higher than emissions observed in adjacent uphill soils, across climate zones and in all aquatic systems except for streams. However, the CH4 contribution (normalized to CO2 equivalents; CO2-eq) to the total GHG emissions of dry inland waters was similar for all types of aquatic systems and varied from 10 to 21%. Although we discuss multiple controlling factors, dry inland water CH4 emissions were most strongly related to sediment organic matter content and moisture. Summing CO2 and CH4 emissions revealed a cross-continental average emission of 9.6 ± 17.4 g CO2-eq m−2 d−1 from dry inland waters. We argue that increasing droughts likely expand the worldwide surface area of atmosphere-exposed aquatic sediments, thereby increasing global dry inland water CH4 emissions. Hence, CH4 cannot be ignored if we want to fully understand the carbon (C) cycle of dry sediments.
KW - Aquatic ecosystems
KW - Dry sediments
KW - Greenhouse gases
KW - Methane
KW - Greenhouse Gases/analysis
KW - Carbon Dioxide/analysis
KW - Methane/analysis
KW - Nitrous Oxide/analysis
KW - Lakes
KW - Rivers
UR - http://www.scopus.com/inward/record.url?scp=85120650148&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85120650148&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.151925
DO - 10.1016/j.scitotenv.2021.151925
M3 - Article
C2 - 34838923
AN - SCOPUS:85120650148
SN - 0048-9697
VL - 814
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 151925
ER -