N2O emissions from the northern Benguela upwelling system .

Arévalo-Martínez, Damian L. , Steinhoff, Tobias, Brandt, Peter , Körtzinger, Arne , Lamont, Tarron, Rehder, Gregor and Bange, Hermann W. (2019) N2O emissions from the northern Benguela upwelling system . Geophysical Research Letters, 46 (6). pp. 3317-3326. DOI 10.1029/2018GL081648.

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Abstract

The Benguela Upwelling system (BUS) is the most productive of all eastern boundary upwelling ecosystems and it hosts a well‐developed oxygen minimum zone. As such, the BUS is a potential hotspot for production of N2O, a potent greenhouse gas derived from microbially‐driven decay of sinking organic matter. Yet, the extent at which near‐surface waters emit N2O to the atmosphere in the BUS is highly uncertain. Here we present the first high‐resolution surface measurements of N2O across the northern part of the BUS (nBUS). We found strong gradients with a three‐fold increase in N2O concentrations near the coast as compared with open ocean waters. Our observations show enhanced sea‐to‐air fluxes of N2O (up to 1.67 nmol m−2 s−1) in association with local upwelling cells. Based on our data we suggest that the nBUS can account for 13% of the total coastal upwelling source of N2O to the atmosphere.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/284274
Keywords: Nitrous oxide; Coastal upwelling; Benguela
Dewey Decimal Classification: 500 Natural Sciences and Mathematics > 550 Earth sciences & geology
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence > FO-R07
OceanRep > The Future Ocean - Cluster of Excellence > FO-R10
Kiel University > Kiel Marine Science
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
IOW
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2018GL081648
ISSN: 0094-8276
Projects: SOPRAN, SACUS, Future Ocean, InGOS
Expeditions/Models/Experiments:
Date Deposited: 28 Feb 2019 06:43
Last Modified: 05 Aug 2019 11:59
URI: http://oceanrep.geomar.de/id/eprint/45899

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