Articles | Volume 13, issue 4
https://doi.org/10.5194/os-13-551-2017
https://doi.org/10.5194/os-13-551-2017
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

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AR by Johannes Hahn on behalf of the Authors (24 May 2017)  Author's response   Manuscript 
ED: Publish subject to technical corrections (29 May 2017) by Mario Hoppema
AR by Johannes Hahn on behalf of the Authors (29 May 2017)  Manuscript 
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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.