Kock, Annette; Schafstall, Jens; Dengler, Marcus; Brandt, Peter; Bange, Hermann Werner (2012): Upwelling and associated heat flux in the equatorial Atlantic inferred from helium isotope disequilibrium. PANGAEA, https://doi.org/10.1594/PANGAEA.860359, Supplement to: Kock, A et al. (2012): Sea-to-air and diapycnal nitrous oxide fluxes in the eastern tropical North Atlantic Ocean. Biogeosciences, 9(3), 957-964, https://doi.org/10.5194/bg-9-957-2012
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Sea-to-air and diapycnal fluxes of nitrous oxide (N2O) into the mixed layer were determined during three cruises to the upwelling region off Mauritania. Sea-to-air fluxes as well as diapycnal fluxes were elevated close to the
shelf break, but elevated sea-to-air fluxes reached further offshore as a result of the offshore transport of upwelled water masses. To calculate a mixed layer budget for N2O we compared the regionally averaged sea-to-air and diapycnal fluxes and estimated the potential contribution of other processes, such as vertical advection and biological N2O production in the mixed layer. Using common parameterizations for the gas transfer velocity, the comparison of the average sea-toair and diapycnal N2O fluxes indicated that the mean sea-toair flux is about three to four times larger than the diapycnal flux. Neither vertical and horizontal advection nor biological production were found sufficient to close the mixed layer budget. Instead, the sea-to-air flux, calculated using a parameterization that takes into account the attenuating effect of surfactants on gas exchange, is in the same range as the diapycnal flux. From our observations we conclude that common parameterizations for the gas transfer velocity likely overestimate the air-sea gas exchange within highly productive upwelling zones.
Dengler, Marcus (2015): Microstructure measurements during POSEIDON cruise POS347. PANGAEA, https://doi.org/10.1594/PANGAEA.854068
Dengler, Marcus (2015): Microstructure measurements during POSEIDON cruise POS348. PANGAEA, https://doi.org/10.1594/PANGAEA.853808
Dengler, Marcus; Schafstall, Jens (2008): Physical oceanography measured along POSEIDON cruise track POS347. PANGAEA, https://doi.org/10.1594/PANGAEA.771887
Dengler, Marcus; Schafstall, Jens (2008): Physical oceanography of 126 CTD casts during POSEIDON cruise POS347 in the Atlantic Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.771866
Krahmann, Gerd (2015): Physical oceanography along L'Atalante cruise ATA03. PANGAEA, https://doi.org/10.1594/PANGAEA.853930
Krahmann, Gerd (2012): Physical oceanography during L'Atalante cruise ATA03. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.777921
Krahmann, Gerd; Bange, Hermann Werner (2015): Physical oceanography along POSEIDON cruise POS348. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.848636
Median Latitude: 18.422668 * Median Longitude: -18.943428 * South-bound Latitude: 17.250000 * West-bound Longitude: -24.766670 * North-bound Latitude: 20.300380 * East-bound Longitude: -16.248200
Date/Time Start: 2007-01-20T14:22:00 * Date/Time End: 2007-02-21T09:47:00
Datasets listed in this publication series
- Bange, HW (2015): Hydrochemistry (nitrous oxide) measured on water bottle samples during POSEIDON cruise POS348. https://doi.org/10.1594/PANGAEA.848670
- Tanhua, T; Malien, F; Fiedler, B et al. (2014): Hydrochemistry of POSEIDON cruise POS347. https://doi.org/10.1594/PANGAEA.833885