The Landry/Stukel labs have sediment traps that drift in the ocean (measuring a water parcel in a Lagrangian way). On the sediment trap array there are traps at various depths as well as buoys and a drogue that cause resistance with the water and allow the drifter to drift with a certain parcel of water. These sediment traps, as well as the Landry lab drifters, are the first thing put in for each of our measuring cycles and the last thing taken out, and each cycle’s area is partially defined as the water parcel that the drifter covers.
We normally put the sediment traps and drifters in and take them out in the middle of the night, but due to some complications with Cycle 1, we removed the sediment trap today in broad daylight, which allowed those of us who work during the day to finally see what happens!
First there was a lot of waiting over the side as we saw it approach. Then the crew caught it with a grappling hook and pulled it to the A-frame in the back of the ship.
Once we had it securely tied off, it was pulled through the winch in the A-frame and the 150 meters of line was pulled up on deck. Each piece of the array (the buoys, the drogue, the sediment traps) were removed from the line as they were pulled up. Ali and Belli were manning the capstain pulling up the line – good work girls!
The most important part of the array – the sediment traps themselves – were positioned at 100 m and 150 m. Each tube was carefully removed from its array as they came up – ready for Mike Stukel and Tom Kelly to analyze before the start of Cycle 2 tomorrow.