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Biogeosciences An interactive open-access journal of the European Geosciences Union
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BG | Volume 15, issue 21
Biogeosciences, 15, 6461–6480, 2018
https://doi.org/10.5194/bg-15-6461-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Biogeosciences, 15, 6461–6480, 2018
https://doi.org/10.5194/bg-15-6461-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 Nov 2018

Research article | 02 Nov 2018

Evaluation of the seasonal formation of subsurface negative preformed nitrate anomalies in the subtropical North Pacific and North Atlantic

Robert T. Letscher and Tracy A. Villareal
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Short summary
The formation rates of oxygen to nitrogen anomalies in the subtropical North Pacific and North Atlantic were estimated from time series data. We find that vertically migrating phytoplankton, which traverse ~ 100–150 m in the upper ocean over days to acquire nutrients from waters at depth and return to the surface for photosynthesis, likely explain the observed anomalies and help sustain surface ocean productivity and the biological pump throughout the annual cycle in the subtropical ocean.
The formation rates of oxygen to nitrogen anomalies in the subtropical North Pacific and North...
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