Articles | Volume 12, issue 24
https://doi.org/10.5194/bg-12-7519-2015
https://doi.org/10.5194/bg-12-7519-2015
Research article
 | 
21 Dec 2015
Research article |  | 21 Dec 2015

Coastal upwelling off Peru and Mauritania inferred from helium isotope disequilibrium

R. Steinfeldt, J. Sültenfuß, M. Dengler, T. Fischer, and M. Rhein

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Short summary
The coastal upwelling systems, e.g. off Peru and Mauritania, are key regions for the emissions of climate relevant trace gases from the ocean into the atmosphere. Here, gases and nutrients are transported into the ocean mixed layer from below. The upwelling velocities, however, are too small to be measured directly. We use the enhancement of helium-3 in upwelled waters to quantify the vertical velocity, which varies between 1.0 and 2.5 metres per day in the coastal regions.
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