Nitrous oxide during the onset of the Atlantic Cold Tongue

Arevalo-Martinez, Damian L., Kock, Annette, Steinhoff, Tobias, Brandt, Peter, Dengler, Marcus, Fischer, Tim, Körtzinger, Arne and Bange, Hermann W. (2017) Nitrous oxide during the onset of the Atlantic Cold Tongue Journal of Geophysical Research - Oceans, 122 (1). pp. 171-184. DOI 10.1002/2016JC012238.

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Abstract

The tropical Atlantic exerts a major influence in climate variability through strong air-sea interactions. Within this region, the eastern side of the equatorial band is characterized by strong seasonality, whereby the most prominent feature is the annual development of the Atlantic Cold Tongue (ACT). This band of low sea surface temperatures (∼22-23°C) is typically associated with upwelling-driven enhancement of surface nutrient concentrations and primary production. Based on a detailed investigation of the distribution and sea-to-air fluxes of N2O in the eastern equatorial Atlantic (EEA), we show that the onset and seasonal development of the ACT can be clearly observed in surface N2O concentrations, which increase progressively as the cooling in the equatorial region proceeds during spring-summer. We observed a strong influence of the surface currents of the EEA on the N2O distribution, which allowed identifying “high” and “low” concentration regimes that were, in turn, spatially delimited by the extent of the warm eastward-flowing North Equatorial Countercurrent and the cold westward-flowing South Equatorial Current. Estimated sea-to-air fluxes of N2O from the ACT (mean 5.18±2.59 µmol m−2 d−1) suggests that in May-July 2011 this cold-water band doubled the N2O efflux to the atmosphere with respect to the adjacent regions, highlighting its relevance for marine tropical emissions of N2O. This article is protected by copyright. All rights reserved.

Document Type: Article
Keywords: Nitrous oxide, Atlantic cold tongue, equatorial upwelling
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R07
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754 > B4
OceanRep > SFB 754
OceanRep > The Future Ocean - Cluster of Excellence > FO-R03
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence > FO-R11
Refereed: Yes
DOI etc.: 10.1002/2016JC012238
ISSN: 0148-0227
Projects: SOPRAN, SFB754, Future Ocean, InGOS, BMBF Nordatlantik
Expeditions/Models:
Date Deposited: 21 Nov 2016 13:37
Last Modified: 01 May 2017 23:38
URI: http://eprints.uni-kiel.de/id/eprint/34805

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