Current position of the SSV Corwith Cramer. Click on the vessel to view position history. Use the layer tools, top right, to change the map style or to view data layers. Dates and times use GMT (Greenwich Mean Time).
SEA Currents: SSV Corwith Cramer
August 06, 2018
Another Day, Another Copepod
5° 35.0’S X 173° 53.6’ W
Ship’s heading and speed
soon to be net towing speed on a science tack
Ship’s Science Plan
Phosphate analysis and evening station
Here we are, on the last leg of our long journey through PIPA! Woot! We're almost there. Destination: American Samoa. We've conducted SO much research and data sampling to add to a fantastic data set in these remote parts of the world. Pretty sweet as.
Our students have learned the ship and are beginning to take on the responsibilities as junior watch leaders. It's very impressive to see how far they've come. As we enter this last phase of the program, the students are effectively carrying out our scientific sampling and sailing (well, maybe with a little supervision). They prep the scientific gear and give the commands to put the gear into the water and recover it. It's by far my favorite part of semester programs because not only do I get put out of my job as assistant scientist onboard (I kid), but also because I get to see the students gain confidence in the ship routines and put all their hard hours of work on display. It's very fulfilling to see and makes me feel happy that I get to be an observer of this transition.
After leaving Nikumaroro yesterday, we immediately picked up our sampling program where we had left off - evening station consisting of a CTD hydrocast, a shallow (40 to 50 m depth) and deep (100 to 120 m) tucker trawl net tow and then a surface neuston net tow. These science deployments help us to understand the biodiversity of zooplankton and nekton (respectively marine organisms that drift with the current or can swim against it) at different depths in the water column throughout these waters. It's very exciting to recover net samples at night, particularly the tucker trawls, which emerge from the depths as ghostly bioluminescent shapes. As we recover and bring the net back on deck, it is always exciting to pour out the contents of the cod end jar and find glowing gelatinous pyrosomes, the zooplankton-terrorizing myctophid fish and copious amounts of our standby zooplankton species, the copepod.
Today was equally exciting as we made our way from Nikumaroro southeast towards Carondelet Reef, a subsea feature nearly reaching the surface from its base at about 4000 m water depth. Needless to say, it was impressive to see breaking waves in the middle of the Pacific Ocean, miles from the nearest island. We kept our distance, turning back when our bottom depth sounder read 400 m water depth. Once the reef was a comfortable ways from the ship, we put the brakes on the ship by going "hove to". With light winds and gentle seas, it seemed the perfect opportunity for a "Sierra Charlie" or swim call. Fortunately for me, I finished my Phosphate nutrient analysis standards in the lab (Holly, 0.999 R^2 value!) just in time for a quick dip in the water - it was nice to cool off and relax for a swim with the rest of the crew.
Another day, another copepod. This trip has been very enjoyable and scientifically so interesting. I'm glad and feel very lucky that I've been able to explore and sail with such a fantastic crew!
P.S. Hi Holly, I love you and miss you!! I'm so excited to get back soon!! Tell Mare, Liz, Catherine and everyone I said hi!