Posts

The TONGA mission

,

David Gonzalez Santana and Géraldine Sarthou from the Chibido team are on board the R/V Atalante in the South Pacific for the TONGA cruise (PIs Sophie Bonnet (MIO) and Cécile Guieu (LOV), + link on the CHIBIDO team website).

The objective of TONGA is to study the inputs of trace elements from shallow hydrothermal sources and their potential impact on biological productivity and the biological carbon pump.

Halfway through the cruise, they are on their way to the ultra-oligotrophic waters (their reference station) after having studied a shallow area (~ 200 m) particularly intense in terms of hydrothermal activity.

Then, the search of a second hydrothermal site is scheduled.

You can follow them on their Twitter account.

(C) Hubert Bataille/ IRD

The silicon cycle is a historical LEMAR theme.

,

The study of the trace metals cycle is one of LEMAR’s strong themes. Improving our knowledge of the metal cycle is crucial to better understand and quantify oceanic biogeochemical cycles of major elements (C, Si, N, S) and the biological carbon pump. The analysis of trace metals and their speciation is particularly difficult because their concentrations are extremely low and their cycle is complex. LEMAR is one of the internationally recognized laboratories for the study of the trace metals cycle, notably through the use and development of advanced techniques (SF-ICP-MS in the context of PSO, FIA, voltammetry). Our expertise in both the dissolved and particulate phase will allow us to study the interactions between these two reservoirs, notably at the oceanic interfaces. These interactions are very little studied at present and yet fundamental to better understand the bioavailability of metals. This theme will strengthen our international visibility, particularly in the context of new GEOTRACES oceanographic campaigns.

Projets

GEOVIDE