Lost & Found – Prototype CO2-measuring Drifter Recovered From The Tropical Atlantic After 7 Weeks Of Silence

The still-experimental NEMO profiling float is designed to monitor CO₂ within the ocean and had been deployed in October at an ocean monitoring station close to the Cape Verde Islands (www.tenatso.com). The freely floating robotic instrument records the depth distributions of salinity, temperature, oxygen and CO₂ in the upper 200 m of the ocean at 30 hour intervals. When at the surface the data are transmitted via the Iridium satellite system to the researchers in Kiel. Initially the float had functioned very well. But then after half a dozen dives the instrument stopped transmitting so that the worst – a total loss – was assumed. Maybe it had been destroyed by a fishing boat and sunk. Maybe its radio antenna had been bitten off by a shark. A few days before Christmas, however, the Kiel group received their unexpected gift when signals from the float were received again. Position: 500 km north of Cape Verde, far away from land.

“We had really given up on it”, said Björn Fiedler of IFM-GEOMAR who is working on the float’s data for his Ph.D. studies. Then everything went very fast. A rescue mission was organized with colleagues of the Cape Verdean partner institute INDP (Instituto Nacional de Desenvolvimento das Pescas) in Mindelo. Fiedler departed for Cape Verde on the day after Christmas and embarked immediately on the INDP’s vessel ISLANDIA whose crew had been brought back from their festivities. The ISLANDIA reached the drifter’s reported location 30 hours later. There it was spotted and could be recovered after a short search. “This was like hitting the jackpot”, the excited Fiedler said. But it turned out even better: despite the interrupted satellite-link the instrument had continued to carry out its measurement routine as planned, and the full set of data had been stored.