Unexpected magnitude of the hydrothermal iron inputs in the deep Pacific

Data from the US GEOTRACES Eastern Pacific Zonal Transect (EPZT, GP16) demonstrate that lateral transport of hydrothermal iron, manganese and aluminium extends up to 4000 km west of the southern East Pacific Ridge, therefore crossing a significant part of the deep Pacific Ocean. The dissolved iron behaves more conservatively than expected, and the resulting flux is more than four times what was assumed before. Results from a coupled ocean circulation/biogeochemical modelling demonstrates that this hydrothermal iron input may sustain a large fraction of the Southern Ocean export production.

Nature decided to largely promote this work by reporting a GEOTRACES 3D view of the bottom Pacific showing the hydrothermal vent as a cover. Congrats to the EPZT team!

15 Resing l
Figure: The top three panels show concentrations of dissolved iron, manganese and aluminum measured during the voyage. The bottom panel shows concentration of a form of helium that marks the water as coming from a hydrothermal vent, and its decreasing concentration away from the ridge reflects mixing rather than a chemical reaction. Click here to view the image larger. Credit: J. Resing / Univ. of Washington.

 

Reference:

Resing, J. A., Sedwick, P. N., German, C. R., Jenkins, W. J., Moffett, J. W., Sohst, B. M., & Tagliabue, A. (2015). Basin-scale transport of hydrothermal dissolved metals across the South Pacific Ocean. Nature, 523(7559), 200–203. doi:10.1038/nature14577. Please click here to access the paper.

Latest highlights

Oceanic lead concentrations and isotopes mapped using explainable machine learning

Using three machine learning models, Olivelli and her colleagues generated global climatologies of lead concentrations and isotopes…

Dissolved nickel sources: transformation and sinks in the Arabian Sea

Malla and co-authors present an extensive study of the distribution of dissolved nickel in the Arabian Sea.

Linking cadmium cycling to phosphate dynamics in the Indian Ocean: Evidence from GEOTRACES transects

Mishra and Singh determined cadmium and phosphate concentrations along 34 complete vertical profiles in the Indian Ocean.

New software enables global ocean biogeochemical modeling in Python

The newly designed tmm4py software makes biogeochemical modelling more widely accessible.

Rechercher