Chasing Eddies

After a bumpy night of sailing from Kahe (West O‘ahu) to the south of O’ahu and Moloka‘i, avoiding [most of] the roughest seas in the channel, we have arrived at our target eddy of interest - a cyclonic eddy (shown in blue) just North of Maui.

Tracking Changes
As we sailed across the Maui eddy, we were able to detect changes in current using R/V Falkor’s Acoustic Doppler current profiler (ADCPReading (and Using) the Data
Dropping CTD probes in the water whilst transecting through the eddy reveals what it looks like under the surface. The satellite data that got us here can only 'see' down 25 meters into the ocean, but eddies can reach hundreds of meters deep. The underway CTD (uCTD) sensor takes a vertical profile every 15-20 minutes down to 300 meters, looking for the thermocline - the transition from warmer to cooler water with depth - as we cruise across the eddy.

Meanwhile, real-time collaboration was happening back in the Falkor library as on-board scientists discussed the incoming data ADCP and uCTD with their colleagues back on land. After 5 hours, finally - job well done! The current vectors (arrows) had gotten smaller (position C), indicating we were in the calm center of the eddy. Time to radio the good news to shivering scientists working on the back deck; we had finally hit the bullseye, the eddy center!

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