VT 163 / OISO-29

Type Oceanographic cruise
Set This cruise is part of the set OISO - OCÉAN INDIEN SERVICE D'OBSERVATION
Ship Marion Dufresne
Ship owner TAAF
Dates 06/01/2019 - 15/02/2019
Chief scientist(s) LO MONACO Claire , METZL Nicolas ORCID

LABORATOIRE D'OCÉANOGRAPHIE ET DU CLIMAT : EXPÉRIMENTATIONS ET APPROCHES NUMÉRIQUES - UMR 7159

Institut Pierre Simon Laplace

Boîte 100

4 place Jussieu

75005 Paris

+33 (1) 44 27 32 48

https://www.locean.ipsl.fr/
DOI 10.17600/18000972
Objective

The OISO cruises were initiated in 1998 with the objective of monitoring and understanding the evolution of CO2 in the ocean. Observations are collected once or twice a year onboard R.V. Marion Dufresne in the South Indian and Southern oceans. Such time-series data are crucial in order to:

  • Contribute to the annual evaluation of the global carbon budget by regularly feeding international data bases, notably SOCAT and GLODAP,
  • Achieve a better understanding of air-sea CO2 flux variability in the South Indian and Southern oceans, with the objective of isolating the anthropogenic perturbation, evaluating the evolution of the oceanic CO2 pump (validation of climate models) and better understanding the mechanisms that drive ocean acidification,
  • Document the variability of physical and biological processes that impact the CO2 cycle in the South Indian and Southern oceans,
  • Provide in situ observations for the calibration and validation of autonomous observations (e.g., satellite data, floats, marine mammals equipped with oceanographic sensors),
  • Document environmental changes related to climate variability and evaluate the impact on marine organisms (coll., BIAF, MNHN, CEBC).

The OISO-29 cruise aimed at pursuing observations in surface waters (underway) and in the water column (20 stations) along the route to the French Subantarctic Islands and in the Antarctic ocean. In addition to the monitoring of oceanic CO2 and ocean acidification, these observations will be used for the validation of data collected by 8 Argo floats and 1 BGC-Argo float deployed during the cruise, and for the programs REPCCOAI and THEMISTO.

Another scientific aim of OISO-29 is the study of the response of phytoplanktonic community to atmospheric inputs of nutrients (N, P, Si, Fe) from volcanic and desertic origins, in contrasted biogeochemical areas: LNLC, HNLC, HN-LSi-LC (French program ITAliANO, LEFE-CYBER 2019-2020, PI C. Ridame).

Published data

Geisen Carla, Ridame Céline, Journet Emilie, Delmelle Pierre, Marie Dominique, Lo Monaco Claire, Metzl Nicolas, Ammar Rawaa, Kombo Joelle, Cardinal Damien (2021). Phytoplanktonic Response to simulated Volcanic and Desert Dust Deposition Events in the South Indian and Southern Oceans. https://doi.org/10.17882/80825


Metzl Nicolas, Lo Monaco Claire (2020). Surface underway measurements of partial pressure of carbon dioxide (pCO2), salinity, temperature and other associated parameters during the R/V Marion Dufresne OISO-29 cruise (EXPOCODE 35MV20190109) in Indian Ocean from 2019-01-09 to 2019-02-08 (NCEI Accession 0208441). https://doi.org/10.25921/0pmp-1r57


Bibliography

Publications

Geisen Carla, Ridame Céline, Journet Emilie, Delmelle Pierre, Marie Dominique, Lo Monaco Claire, Metzl Nicolas, Ammar Rawaa, Kombo Joelle, Cardinal Damien (2022). Phytoplanktonic response to simulated volcanic and desert dust deposition events in the South Indian and Southern Oceans. Limnology And Oceanography, 67(7), 1537-1553. Publisher's official version : https://doi.org/10.1002/lno.12100 , Open Access version : https://archimer.ifremer.fr/doc/00775/88667/


Thesis using campaign data

Leseurre Coraline (2022). Mécanismes de contrôle de l’absorption de CO2 anthropique et de l’acidification des eaux dans les océans Atlantique Nord et Indien Austral / Mechanisms controlling anthropogenic CO2 uptake and acidification in North Atlantic and Southern Indian Ocean waters. PhD Thesis, Université Sorbonne.