It has been 12 days since I first stepped foot on the R/V Atlantis. Since my previous blog post (7 days ago) a lot has happened and we are moving fast. Currently, we are off the coast of Mexico-we passed the border early this morning. The weather difference between here and off of Washington is drastic in the best way. Regardless, it has remained overcast for more days than not, and we have had only a light rain once or twice.
On day 5 we had deployed the Sonardyne Compatt 6 Transponder beacon to 100ft to test if it correctly communicated to the deck unit on board the ship. The next day we deployed it again, but this time with the accessories. By this I mean we secured the beacon in a large yellow float, and attached a chain to the bottom of the beacon that was attached to a 300lb weight(picture below for reference). When it was deployed it sank to the bottom of the ocean and began transmitting information. At the bottom of the beacon was an acoustic release, which means that when we want the transponder to resurface the next morning, we send it a signal and the beacon will release the chain and weight that is holding it down and it will begin to rise. The water was so deep, it took the float 40 minutes to reach the surface!
Along with testing the transponder, we also tested the new multibeam system while we were still off the coast of Washington/Canada. The ship has been equipped with a new EM124 Multibeam that was mounted permanently on the hull of the Atlantis. Thanks to my time at Cape Fear I have had recent experience with different sonars and multibeam data before this. We spend over a day doing a patch test for the multibeam, running lines back and forth to determine the correct calibrations. The lines were 1500 meters apart and the swath of the multibeam was over 1600 meters! Ultimately this means the sonar was mapping 1600 meters of the sea floor every few seconds. And then half way through the patch test the technician changed the swath width from 30 degrees to 140 degrees and the swath width increased to 12,000 meters! It was crazy to see. The software we used to view the real time data was SIS version 5.6.0.441. The software not only showed us the normal data from the multibeam, but it made a 3D image of the data in real time too, and it even mapped the intensity of the scatter back which showed us something similar to what a side scan sonar would show. It was really interesting to be able to observe this process and I am so glad I was able to experience it. On top of the patch test for the multibeam, before we ran a line we had to launch an XBT. An XBT is a torpedo shaped device that measures temperature, sound speed, and salinity. The device is dropped into the water and sinks deep into the water(1800 meters in 3 minutes). It is attached to a thin line of plastic and copper which runs into a wire on deck that feeds real time information to a deck unit. When the XBT has reached max depth, we break the thin line of copper and plastic and bring in the launcher, but leave the XBT into the sea. This was a new piece of equipment to me and I enjoyed learning and launching it.
On day 10 we reached San Francisco around 0800. It was my first time seeing SF or California for that matter. We stayed in the bay anchor down until around 1900. We had 5 crew leave the ship by small boat that morning and we had a food order coming in that evening, mostly fresh fruit and veggies. We passed Alcatraz and tons of landmarks that the crew pointed out to me. The city looked huge, and it was a lot colder than I expected SF to be during the summer. I wish I could have seen more but I am happy to be able to say I have sailed under the Golden Gate Bridge!
On the days in between, I have been cleaning the labs, troubleshooting, setting up monitors, fixing printer problems and getting to know the ship and crew better. I start my mornings on the bridge and end the day in the movie room with some of the crew. I have seen seals and dolphins in the SF Bay, wales offshore up north, seen tuna jumping about, and some areas filled with jellyfish. I am grateful to be able to spend time on the R/V Atlantis and work directly with WHOI crew, and I am looking forward to the Panama Canal! They are estimating we will arrive there on August 2nd.
Until next time-
—Balancing Act- standing on a stepstool while on a rocking ship!
—Launching the XBT off the stern of the ship.
—Deploying the Sonardyne Compatt 6 Transponder
—View from the bridge looking back
—The Golden Gate Bridge
—Alcatraz
— Sunset

—Coast of California