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Basin‐scale estimates of greenhouse gas emissions from the Mara River, Kenya: Importance of discharge, stream size, and land use/land cover

Mwanake, Ricky M. ORCID iD icon 1; Gettel, Gretchen M. 1; Ishimwe, Clarisse; Wangari, Elizabeth G. 1; Butterbach-Bahl, Klaus 1; Kiese, Ralf ORCID iD icon 1
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)

Abstract:

Greenhouse gas fluxes (CO2, CH4, and N2O) from African streams and rivers are under-represented in global datasets, resulting in uncertainties in their contributions to regional and global budgets. We conducted year-long sampling of 59 sites in a nested-catchment design in the Mara River, Kenya in which fluxes were quantified and their underlying controls assessed. We estimated annual basin-scale greenhouse gas emissions from measured in-stream gas concentrations, modeled gas transfer velocities, and determined the sensitivity of up-scaling to discharge. Based on the total annual CO2-equivalent emissions calculated from global warming potentials (GWP), the Mara basin was a net greenhouse gas source (294 ± 35 Gg CO2 eq yr1). Lower-order streams (1–3) contributed 81% of the total fluxes, and higher stream orders (4–8) contributed 19%. Cropland-draining streams also exhibited higher fluxes compared to forested streams. Seasonality in stream discharge affected stream widths (and stream area) and gas exchange rates, strongly influencing the basin-wide annual flux, which was 10 times higher during the high and medium discharge periods than the low discharge period. ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2022
Sprache Englisch
Identifikator ISSN: 0024-3590, 1939-5590
KITopen-ID: 1000148714
HGF-Programm 12.11.22 (POF IV, LK 01) Managed ecosystems as sources and sinks of GHGs
Erschienen in Limnology and Oceanography
Verlag John Wiley and Sons
Band 67
Heft 8
Seiten 1776-1793
Vorab online veröffentlicht am 23.06.2022
Nachgewiesen in Dimensions
Scopus
OpenAlex
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 2 – Kein HungerZiel 13 – Maßnahmen zum Klimaschutz

Verlagsausgabe §
DOI: 10.5445/IR/1000148714
Veröffentlicht am 15.07.2022
Originalveröffentlichung
DOI: 10.1002/lno.12166
Scopus
Zitationen: 24
Web of Science
Zitationen: 20
Dimensions
Zitationen: 26
Seitenaufrufe: 135
seit 16.07.2022
Downloads: 92
seit 16.07.2022
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