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Grefe, Imke, Fielding, Sophie, Heywood, Karen J. 
ORCID: https://orcid.org/0000-0001-9859-0026 and Kaiser, Jan ORCID: https://orcid.org/0000-0002-1553-4043
(2018)
Nitrous oxide variability at sub-kilometre resolution in the Atlantic sector of the Southern Ocean.
PeerJ, 6.
ISSN 2167-8359
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Abstract
The Southern Ocean is an important region for global nitrous oxide (N2O) cycling. The contribution of different source and sink mechanisms is, however, not very well constrained due to a scarcity of seawater data from the area. Here we present high-resolution surface N2O measurements from the Atlantic sector of the Southern Ocean, taking advantage of a relatively new underway setup allowing for collection of data during transit across mesoscale features such as frontal systems and eddies. Covering a range of different environments and biogeochemical settings, N2O saturations and sea-to-air fluxes were highly variable: Saturations ranged from 96.5% at the sea ice edge in the Weddell Sea to 126.1% across the Polar Frontal Zone during transit to South Georgia. Negative sea-to-air fluxes (N2O uptake) of up to −1.3 µmol m−2 d−1 were observed in the Subantarctic Zone and highest positive fluxes (N2O emission) of 14.5 µmol m−2 d−1 in Stromness Bay, coastal South Georgia. Although N2O saturations were high in areas of high productivity, no correlation between saturations and chlorophyll a (as a proxy for productivity) was observed. Nevertheless, there is a clear effect of islands and shallow bathymetry on N2O production as inferred from supersaturations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | nitrous oxide,southern ocean,high-resolution measurements,air-sea gas exchange,marine biogeochemistry,laser spectroscopy,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 06 Jul 2018 12:30 |
| Last Modified: | 20 Mar 2023 10:46 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/67543 |
| DOI: | 10.7717/peerj.5100 |
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