Ocean Science
Ocean Science
OS
Articles | Volume 13, issue 4
Articles | Volume 13, issue 4
https://doi.org/10.5194/os-13-551-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/os-13-551-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 13, issue 4
Research article
 | 
06 Jul 2017
Research article |  | 06 Jul 2017

Decadal oxygen change in the eastern tropical North Atlantic

Johannes Hahn, Peter Brandt, Sunke Schmidtko, and Gerd Krahmann

Data sets

Oxygen, hydrography and velocity in the eastern tropical North Atlantic (1999-2015) J. Hahn, P. Brandt, S. Schmidtko, and G. Krahmann https://doi.pangaea.de/10.1594/PANGAEA.869568

Argo float data and metadata Global Data Assembly Centre https://doi.org/10.17882/42182

Maps of Absolute Dynamic Topography & absolute geostrophic velocities Aviso, MADT-H-UV https://www.aviso.altimetry.fr/index.php?id=1271

Monthly Isopycnal & Mixed-layer Ocean Climatology (MIMOC) S. Schmidtko, G. C. Johnson, and J. M. Lyman https://www.pmel.noaa.gov/mimoc/

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Short summary
Recent studies have shown that the eastern tropical North Atlantic is subject to a strong decrease of the oceanic oxygen concentration in the upper 1000 m from the 1960s to today. By analyzing a broad observational data set, this study found an even stronger oxygen decrease in the upper 400 m throughout the past decade, whereas oxygen increase was found below (400–1000 m). Changes in the strength of the zonal currents are the most likely reason for the observed decadal oxygen changes.
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