SWINGS cruise

French GEOTRACES GS02 cruise

In the remote Southern Ocean considered as a nutrient “hub” between the Atlantic, Pacific and Indian Oceans, the sources, sinks and processes controlling vital nutrient distribution and thus the biological carbon pump remain a black-box to date. In this context, SWINGS is a multidisciplinary 4-year project dedicated to elucidate trace element sources, transformations and sinks along a section crossing key areas of the Southern Ocean. Major French contribution to the international GEOTRACES programme SWINGS involves 80 scientists (19 international laboratories, 6 countries). The major piece of this ambitious project is the oceanographic cruise “SWINGS” (South Indian Ocean GEOTRACES Section) to which 48 researchers will participate.

The French GEOTRACES SWINGS GS02 cruise will start from La Réunion island (France) on January 13th, 2021 and end at the same place on March 8th, 2021.  During 52 days, many stations will be sampled with various pieces of equipment on board the Marion Dufresne II research vessel in order to elucidate trace element sources, transformations and sinks in key areas of the Indian sector of the Southern Ocean contributing to the global effort of the GEOTRACES programme.

Diary

March 8, 2021: The last day

At 9h20 this morning, the RV Marion-Dufresne makes its grand entrance into the West Port of Reunion Island. Slightly tricky maneuver, neither the entrance nor the dock are very wide. Slowly, the quay gets closer.  Once connected to the shore, the loop is complete. A current of emotions, hugs, the last ones before returning to […]

4 March 2021: The scientific command post and the cruise chief scientists

Very little mention has been made to the scientific command post so far and yet it is one of the ship’s neuralgic centers, especially for the scientists (and Martin). It is from the command post that the controls for lowering, raising and closing the rosettes start, it is from the command post that the strategic […]

The cruise diary of Nolwenn Lemaitre

Nolwenn Lemaitre, on board the GEOTRACES SWINGS cruise (January-March 2021, Southern Ocean), sends a small cruise diary every week to the students of the Morlaix high school and the Locquirec school in France. In her diary, Nolwenn explains the science done on board the research vessel, the scientific discoveries and, above all, she makes the […]

3 March 2021: Nostalgia and grace

Last night we crossed the 40th parallel, this time the gateway to the famous eponymous roars. In the wake, a few white-chinned petrels, a sooty one and our faithful Serge, this great albatross who has been following us for a long time… it doesn’t matter to us whether it’s him or a cousin, his name […]

23 February 2021: Night of auroras

This night, the sea is quite quiet. In transit in the southernmost sector of the ocean section, we head towards station 57 (56°24 S – 78°23 E). I (Catherine) fill the logbook, in a soft night routine. Around 2 am, Manu arrives at the PC. “Did you see how clear the night is? It’s an […]

20 FEBRUARY 2021 : What on Earth is going on under our feet?

After more than a month at sea, the Marion Dufresne has travelled 10159 km and navigated on changing sea floor, ranging from 100 m to 5 km deep. Under our feet are organisms of various sizes: from microscopic to the largest whales in the world! At the “centre” of this complex food chain are the […]

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