search DOI 10.17882/92537

Water column geochemistry data from REVOSIMA MAYOBS1 Cruise

The Mayotte volcanological and seismological monitoring network (REVOSIMA) was created in response to the sub-marine eruption that started in May 2018. Composed by IPGP, BRGM, IFREMER and CNRS, its main missions are:

  • 1) to observe and study volcanic phenomena through real-time volcano monitoring,
  • 2) to conduct research programs,
  • 3) to communicate, disseminate and inform authorities and civil society.

These real-time observations and research can contribute to the prevention, and mitigation of seismic and volcanic risks. The main objective is to collect geological, geophysical and geochemical data over long periods of time to improve the understanding and modeling of volcanic processes at active volcanoes, to allow the systematic elaboration of long-term multi-parameters databases available to the scientific community, and to inform the authorities in charge of civil protection of any change in the volcano activity and after periods of local and regionally felt earthquakes.

The MAYOBS campaigns are carried out to monitor the evolution of the seismic and volcanic phenomenon which has affected the island of Mayotte since May 2018. They are carried out as part of an action program financed by the Ministry of Research, the General Directorate of prevention and risks of the Ministry of Ecological and Inclusive Transition, with the support of the interministerial delegate for major risks overseas and in conjunction with the other ministries and institutes involved (IPGP, IPGS, BRGM, IFREMER). They focus on the region east of Mayotte. The bathymetric surveys carried out by SHOM in the volcano area also contribute to the MAYOBS project.

IFREMER carried out water column geochemistry measurements during MD220-MAYOBS cruise. In the present database, 5 stations were investigated between 15th and 17th May 2019 using in situ measurements embedded in a CTD-Rosette. Samples (max. 16 bottles per station) were anaylized onboard and onshore depending on the parameters. The quality controlled and process data are:

  • In situ: salinity (conductivity), temperature, depth, dissolved oxygen, turbidity
  • Onboard: pH, alkalinity, dissolved inorganic carbon
  • Onshore: dissolved CO2 CH4 H2, silicates

Disciplines

Chemical oceanography, Marine geology

Keywords

water column, geochemistry, Fani Maore, gas analysis, pH, O2, salinity, turbidity, temperature, CH4, CO2, Alkalinity, Silicate, H2

Location

-12.4N, -13.4S, 46.3E, 45.2W

Devices

In situ sensors Manufacturer Model Serial Number Unit Resolution
Deck Unit Sea-Bird SBE11Plus      
CTD Sea-Bird SBE9Plus      
Rosette Sea-Bird SBE32      
Depth Sea-Bird SBE12   m 0.1
Temperature Sea-Bird SBE3 5555 °C 0.01
Salinity Sea-Bird SBE4 4031 psu 0.01
[O2] Aadera     µmol/kg 0.01
Turbidity NKE STBD 2.5 04 NTU 0.01

 

  Parameter Method Unit Limit of detection Resolution Bibliographic ref
Onboard pH Glass electrode     0.01  
Onboard Alkalinity

Potentiometric titration

Titrino 848 Metrohm

 mmol/L   0.001  
Onboard DIC

Potentiometric titration

Titrino 848 Metrohm

 mmol/L   0.001  
Onshore [CO2] Head space / GC / HID µmol/L 0.05 0.1 (1)
Onshore [H2] Head space / GC / HID nmol/L 1.5 1 (1)
Onshore [CH4] Purge and trap / GC / FID nmol/L 0.03 0.1

(2), (3)
Onshore [Silicates] FIA Seal Analytical AA3 µmol/L   1  

(1) Donval J.-P., Guyader V. (2017). Analysis of hydrogen and methane in seawater by “Headspace” method: Determination at trace level with an automatic headspace sampler. Talanta, 162, 408-414. https://doi.org/10.1016/j.talanta.2016.10.034

(2) Charlou J.-L., Fouquet Y., Bougault H., Donval J.-P., Etoubleau J., Jean-Baptiste P., Dapoigny A., Appriou P., Rona P.A.
Intense CH4 plumes generated by serpentinization of ultramafic rocks at the interaction of the 15°20′N fracture zone and the Mid-Atlantic Ridge. Geo. Cosmo. Act., 62 (1998), 2323-2333
(3) Donval J.-P., Charlou J.-L., Lucas L. Analysis of light hydrocarbons in marine sediments by headspace technique: Optimization using design of experiments. Chemometrics and Intelligent Laboratory Systems, 94 (2008), 89-94

Data

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How to cite
Rinnert Emmanuel, Donval Jean-Pierre, Guyader Vivien (2024). Water column geochemistry data from REVOSIMA MAYOBS1 Cruise. SEANOE. https://doi.org/10.17882/92537

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Oceanographic cruises
MAYOBS1,
MAYOBS
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