Nitrous oxide variability at sub-kilometre resolution in the Atlantic sector of the Southern Ocean

Grefe, Imke and Fielding, Sophie and Heywood, Karen J. and Kaiser, Jan (2018) Nitrous oxide variability at sub-kilometre resolution in the Atlantic sector of the Southern Ocean. Peerj. 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:
Journal Article
Journal or Publication Title:
Peerj
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2800
Subjects:
ID Code:
145218
Deposited By:
Deposited On:
26 Aug 2020 12:00
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Sep 2020 07:00