Diapycnal flux of nitrous oxide across the thermocline

Fischer, Tim, Kock, Annette, Bange, Hermann W., Brandt, Peter, Dengler, Marcus and Schafstall, Jens (2010) Diapycnal flux of nitrous oxide across the thermocline [Talk] In: 3. SOPRAN Annual Meeting, 23.03.2010, ZMAW, Hamburg, Germany.

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Abstract

The oceans account for an estimated 5 to 40 percent of the total supply of potent greenhouse gas nitrous oxide (N2O) to the atmosphere. Our contribution explores oceanic diapycnal N2O flux in the area of the oxygen minimum zone (OMZ) off West Africa in order to determine N2O sea-to-air-flux more precisely.

Within the OMZ, nitrification in regions of low oxygen concentration below the thermocline is suggested to be the main N2O source. In the open ocean far from coastal upwelling, upward transport of N2O from source regions across the thermocline to mixed layer should mainly be driven by turbulent mixing.

Collected data during SOPRAN phase 1 comprise N2O profiles and associated turbulent dissipation profiles of the upper 500m at the OMZ and TENATSO time series station, complemented by oxygen and CTD profiles. This data set allows direct calculation of N2O diapycnal flux, especially across the thermocline where very low turbulent mixing meets steep N2O gradients.

Document Type: Conference or Workshop Item (Talk)
Keywords: Oceanography; SOPRAN
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Projects: SOPRAN
Date Deposited: 09 Aug 2010 12:18
Last Modified: 23 Feb 2012 06:00
URI: http://eprints.uni-kiel.de/id/eprint/8768

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