School Email Exchange

Are you testing water quality in the area where plastics are found?

Posted on October 19 2012

Question submitted by Bainbridge High School

Yes, we test the water for nutrients such as phosphates and nitrate, and for chlorophyll a.  One deployment we use to test the water is the hydrocast, which consists of a "carousel" holding twelve Niskin bottles that are programmed to close and collect seawater at different depths.

The carousel is lowered into the water to a specific depth on a hydrowire with the Niskin bottles open. As it is raised up to the surface the Niskin bottles close, collecting water samples at pre-programmed depths.