Dissolved iron in the tropical North Atlantic Ocean

Surprisingly high dissolved iron (dFe) values have been found in the subsurface oxygen minimum waters of the tropical North Atlantic from the Cape Verde Islands west to 42°W, reaching concentrations of 1.0-1.5 nmol/kg. Fitzsimmons’ and co-authors results suggest that biological regeneration is a more consistent explanation for this enrichment than sedimentary diagenetic dFe mixed out from the African margin. The authors also mention the limits of artificial fertilizations, since their data demonstrates that high levels of surface Fe enrichment might be relatively ineffective as a means of removing carbon from the surface ocean.

13 Fitzsimmons lFigure: This figure shows vertical dFe distribution in the upper 1000 m of the tropical North Atlantic Ocean. High dFe concentrations are in warm colours (red, orange,etc). Black dots represent sample locations. Please click here to see the figure larger.

 

Reference:

Fitzsimmons, Jessica N., Ruifeng Zhang, Edward A. Boyle (2013) Dissolved iron in the tropical North Atlantic Ocean, Marine Chemistry, Volume: 154, 87-99, DOI:10.1016/j.marchem.2013.05.009

Latest highlights

Science Highlights

Dissolved iron and manganese fates reveal processes along the hydrothermal TAG plume

González-Santana and co-workers performed high-spatial resolution analyses of dissolved iron and manganese samples collected at the Mid Atlantic Ridge

20.10.2020

Science Highlights

The power of combining geochemical tracer data with direct current measurements

Learn about new discoveries done combining seawater Rare Earth Elements concentrations and direct physical oceanographic observations

14.10.2020

Science Highlights

Loss of old Arctic sea ice increases methylmercury concentrations

Researchers from the SCRIPPS, the Stockholm Natural Museum and the Mediterranean Institute of Oceanography show the importance of sea ice composition on methylmercury budgets

02.09.2020

Science Highlights

Estimating Atmospheric Trace Element Deposition Over the Global Ocean

A recently developed method based on the natural radionuclide beryllium-7 has provided a means to estimate the bulk atmospheric trace element deposition velocity

Rechercher