Deployment: TONGA_2019

Deployment: 
TONGA_2019
DOI: 
Chief Scientist: 
Sophie Bonnet (Mediterranean Institute of Oceanography, MIO)
Cecile Guieu (Villefranche Oceanographic Laboratory, LOV)
Platform:
Platform Type:
 vessel
Start Date: 
2019-10-31
End Date: 
2019-12-06
Location: 
Western Tropical South Pacific (WTSP)
Description

[ shallow hydroThermal sOurces of trace elemeNts: potential impacts on biological productivity and the bioloGicAl carbon pump (TONGA) ]

The objectives of the cruise were to investigate at least 2 active volcanoes where shallow (< 500 m) hydrothermal sites could release chemical elements both able to fertilize and/or bring toxicity to the planktonic food web.

  1. Task 1:  Characterize chemically and optically the hydrothermal fluids and to compare the source from below (shallow hydrothermal fluids) with the source from above (atmospheric deposition);
  2. Task 2:  Related to the dynamical dispersion of the fluids at small and regional scale;
  3. Task 3: Investigate the impact of the shallow hydrothermal sources on the biological activity and diversity, and the feedback to the atmosphere via the oceanic emissions of primary and secondary aerosols.