You are here: Home / Research / Groups / Toulouse Marine Isotopy / INDOMIX

INDOMIX project

by TIM last modified Apr 03, 2015 07:19 PM

INDOMIX project

 

Objectives:

The general scientific objectives of the INDOMIX project are to study the internal tides, the associated turbulent mixing and the chemical and physical transformations of the water masses when transiting through the Eastern Indonesian Seas. A collaborative project (PI: Ariane Koch-Larrouy) was conducted off the Indonesian archipelago and put together physicists and geochemists.

Scientific Rationale

The Indonesian archipelago is a region of strong water mass transformation. This region is characterized by intense vertical mixing because strong internal tides remain trapped in semi-enclosed seas, with the result that a large amount of tidal energy remains available for vertical mixing. To study the internal tides, the associated turbulent mixing and the chemical and physical transformations of the water masses of the Eastern Indonesian Seas, a collaborative project was conducted in that area. To achieve our goals, we combined geochemical tools (Rare Earth concentrations, Nd isotopic composition, radium isotopes, 227Ac, and trace element concentrations on the particulate samples) and physical observations (hydrophysical (CTD)-current profile (LADCP) and Microstructure (VMP 600) measurements).

Strategy and sampling

 

Rare Earth (REE) concentrations and Nd isotopes: These parameters are good tracers of processes occurring at the land-ocean interface. They are also tagging the different water masses with different signatures, which allows following water mass trajectories and mixing. Sample volumes of 10l where collected, filtered on board. An aliquote of 500 ml was dedicated to the measurement of the Rare Earth concentrations. Filtered particles were stored for the analysis of the solid REE and the lithogenic tracers.

 

Results



Participants: P. van Beek, C. Jeandel, F. Lacan, M. Souhaut, M. Labatut, A. Koch-Larrouy

Partners:

LEGOS : Laboratoire d'Etudes en Géophysique et Océanographie Spatiales (Toulouse)

Fundings: LEGOS, INSU





Document Actions

logo cnes logo IRD Logo université de Toulouse Logo université Paul Sabatier Logo CNRS
Logo bibliothèque OBS Logo Observatoire Midi Pyrénées