Friday, 2 May 2014

Floating PIES at 5:30 am!

A post by Lola Pérez Hernández

On Wednesday morning we made our first recovery. Some of us woke up at 4:30 to activate the release that freed the instrument WBP1. It took about 45 minutes to reach the surface. So at 5:30 a group of us stood on the bridge of the boat, searching the horizon for a tiny flashing white light. It finally made its appearance ahead of the starboard bow.  We moved the boat towards that tiny flashing light and there it was. I’m sorry to tell there were no pies but there was a big floating white buoy making tics every seconds. WBP1 is a PIES is a Pressure and Inverted Echo-Sounder that sends noise to the surface and listens for it to came back, and with that procedure we can know things about the water column such us the dynamic height, the depth of the mixing layer or the stratification

First a small light in the distance
Recovering the PIES
Retrieving the data
Back on depth after 18 months
on the ocean floor

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