Citation:

bg-9-957-2012

Name: Upwelling and associated heat flux in the equatorial Atlantic inferred from helium isotope disequilibrium
Published: 2012
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

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.

Related to:

Dengler, Marcus (2015): Microstructure measurements during POSEIDON cruise POS347 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.854068

Dengler, Marcus (2015): Microstructure measurements during POSEIDON cruise POS348 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.853808

Dengler, Marcus; Schafstall, Jens (2008): Physical oceanography measured along POSEIDON cruise track POS347 [dataset]. 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 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.771866

Krahmann, Gerd (2012): Physical oceanography during L'Atalante cruise ATA03 [dataset]. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.777921

Krahmann, Gerd (2015): Physical oceanography along L'Atalante cruise ATA03 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.853930

Krahmann, Gerd; Bange, Hermann Werner (2015): Physical oceanography along POSEIDON cruise POS348 [dataset]. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.848636

Krahmann, Gerd; Bange, Hermann Werner (2015): Physical oceanography during POSEIDON cruise POS348 [dataset]. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.848597

Project(s):

Surface Ocean Processes in the Anthropocene (SOPRAN)

Coverage:

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

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

2 datasets

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Datasets listed in this publication series

Tanhua, T; Malien, F; Fiedler, B et al. (2014): Hydrochemistry of POSEIDON cruise POS347. https://doi.org/10.1594/PANGAEA.833885
Bange, HW (2015): Hydrochemistry (nitrous oxide) measured on water bottle samples during POSEIDON cruise POS348. https://doi.org/10.1594/PANGAEA.848670