Projects per year
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.
|Publication status||Published - 6 Jul 2018|
- Nitrous oxide
- Southern Ocean
- High-resolution measurements
- Air-sea gas exchange
- Marine biogeochemistry
- Laser spectroscopy
- 2 Finished
Gliders: Excellent New Tools for Observing the Ocean (GENTOO)
Natural Environment Research Council
1/10/10 → 31/03/15
INTRAMIF: Initial Training in Mass Independent Fractionation
Kaiser, J., Rockmann, T., Blunier, T., Janssen, C., Johnson, M., Landais, A., Leuenberger, M., Luz, B. & Savarino, J.
1/09/09 → 31/08/13