Half of global methane emissions come from highly variable aquatic ecosystem sources

Atmospheric methane is a potent greenhouse gas that plays a major role in controlling the Earth’s climate. The causes of the renewed increase of methane concentration since 2007 are uncertain given the multiple sources and complex biogeochemistry. Here, we present a metadata analysis of methane flux...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Nature geoscience Jg. 14; H. 4; S. 225 - 230
Hauptverfasser:	Rosentreter, Judith A., Borges, Alberto V., Deemer, Bridget R., Holgerson, Meredith A., Liu, Shaoda, Song, Chunlin, Melack, John, Raymond, Peter A., Duarte, Carlos M., Allen, George H., Olefeldt, David, Poulter, Benjamin, Battin, Tom I., Eyre, Bradley D.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Goddard Space Flight Center Springer Nature 01.04.2021 Nature Publishing Group UK Nature Publishing Group
Schlagworte:	704/106/286 704/106/47/4113 704/106/694/2739 704/47/4113 Anthropogenic factors Aquatic ecosystems Aquatic environment Aquatic sciences & oceanology Atmospheric methane Biogeochemistry CH4 Climate Climate change Earth and Environmental Science Earth Resources And Remote Sensing Earth Sciences Earth System Sciences Ecosystems Emissions control Empirical analysis Eutrophication Fluxes Freshwater Freshwater ecosystems Geochemistry Geology Geophysics/Geodesy Greenhouse gases Inland water environment lake Land management Land use Land use management Life sciences Methane Methane emissions Mitigation river Sampling designs Sciences aquatiques & océanologie Sciences du vivant Skewed distributions Urbanization Aquatic Ecosystem Methane Ch4
ISSN:	1752-0894, 1752-0908, 1752-0908
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Atmospheric methane is a potent greenhouse gas that plays a major role in controlling the Earth’s climate. The causes of the renewed increase of methane concentration since 2007 are uncertain given the multiple sources and complex biogeochemistry. Here, we present a metadata analysis of methane fluxes from all major natural, impacted and human-made aquatic ecosystems. Our revised bottom-up global aquatic methane emissions combine diffusive, ebullitive and/or plant-mediated fluxes from 15 aquatic ecosystems. We emphasize the high variability of methane fluxes within and between aquatic ecosystems and a positively skewed distribution of empirical data, making global estimates sensitive to statistical assumptions and sampling design. We find aquatic ecosystems contribute (median) 41% or (mean) 53% of total global methane emissions from anthropogenic and natural sources. We show that methane emissions increase from natural to impacted aquatic ecosystems and from coastal to freshwater ecosystems. We argue that aquatic emissions will probably increase due to urbanization, eutrophication and positive climate feedbacks and suggest changes in land-use management as potential mitigation strategies to reduce aquatic methane emissions.
Bibliographie:	GSFC Goddard Space Flight Center ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 scopus-id:2-s2.0-85103672100
ISSN:	1752-0894 1752-0908 1752-0908
DOI:	10.1038/s41561-021-00715-2