After a couple days on the ship, it was nice to get a chance to put some sampling devices over the side to collect water and sediment. The day watch literally learned the ropes on how to deploy and recover the multicore. Once a core comes back on deck, it must be “extruded” and sliced up to produce subsamples which are bagged or bottled for later analysis. The CTD is a device that measures the conductivity and temperature of water with depth. The conductivity of the water is used to ascertain the salinity – the more dissolved ions, the more the water is able to conduct electricity. The CTD (not shown) also has other sensors, such as oxygen, turbidity and fluorescence (which can be related to the amount of marine plants in the water). Also, the CTD has a bunch of water bottles which can be “fired” at any depth, depending on the observed data profile. The water samples can then be used to analyze water chemistry and/or biology. Both are being done on this cruise.
The day watch gets to work (left). Ryan Gibbons helps prep for the next core (right).
Sampling is a team effort.
Dave Sybert and Reide Corbett "extrude" or cut up a core.
Ian Conery bottles some sediment.