Sunday, March 14, 2010
Friday, March 12, 2010
John and Viv deploy the TOAD each night and make 3 or 4 passes over the reef to assess coral coverage and other bottom features. They were particularly happy to have found several areas of reef with the coral Euphyllia paraancora. This coral is found in the tropical Western Pacific and the Indian Ocean, but it is not common. It is heavily harvested for the aquarium trade and more susceptible to bleaching than more robust coral species. It is listed as vulnerable and is further threatened by the predicted threats of climate change and ocean acidification. It was put on the IUCN Red List and is protected via CITES, both as of October, 2009.
Above: HARP Diagram
One night we deployed a HARP, a High-Frequency Acoustic Recording Package used to study cetaceans (whales and dolphins). The scientist in charge of this equipment was not onboard but had arranged with the Chief Scientist to put out this equipment near Saipan. This HARP will sit on the seafloor for 2 years collecting sounds. HARPs record ambient ocean noise including low-frequency baleen whale calls, high-frequency dolphin clicks, sounds in between and man-made sounds from ships, sonar, and seismic exploration. When the HARP is retrieved, the sounds can be analyzed and we will learn more about the cetacean populations of the Mariana Islands.
A few days ago, Glen gave me a great tour of the engine room. It is beyond the scope of this blog to describe it here, but I can’t resist including a few pictures. I am always amazed by what it takes to keep a ship like this running. They call it an “unmanned engine room” because an alarm will ring if something needs attention like overheating or low oil pressure. It may be called “unmanned” but it takes a lot of man-hours to keep it that way. The engine room and machine shop are really clean and well organized―I didn’t see a drip of oil or a smudge of grease.
Right: One of 4 diesel engines that provided the electricity for the ship and run the electric motors that drive the propellers.
Tuesday, March 9, 2010
BotCam – Jake Asher provides the story of the BotCams used on this trip.
Meet the Crew – read about the fun lives of the people making this expedition possible.
It would be easy to start every post with a beautiful sunrise or sunset photo. In this one, you can see Anatahan Island in the background. Just before the sunset, 3 large wahoo were caught. Poke and fried fish are the favorite items on recent menus (breakfast, lunch and dinner).
Right: Steve, Frances and Mills show off their catch.
This photo/diagram shows how sonar waves ping the seafloor and also shows the bathymetric map that is made from the data.
We used the multibeam sonar to map shallow banks north of Farallon de Mendinilla and east of Anatahan and Sarigan. The multibeam work continued day and night and produced huge amounts of data that needed to be processed. I can only sit at the computer for short periods, but the map team members work 10 hour shifts and most of that time is spent processing the data and making new maps. There are always 2 or 3 people processing the data.
Left: The TOAD seen with cameras facing forward.
Monday night, we put out the TOAD (Towed Optical Assessment Device). This camera is towed behind the ship and sends video directly to the control room. We were able to see some of the seafloor we had been mapping. The first run of the camera went for 2.25 hours, covered a distance of 3 miles and went to a maximum depth of 400 feet. The second run went for 3.5 hours, over 4.5 miles to a maximum depth of 300 feet. Towing the camera sounds easy, but someone must be on the controls to keep the camera from crashing into the bottom. The camera needs to be close to the bottom for the best video, but without someone on the controls, it can crash. Driving requires constant attention. Most of the seafloor had a sand coverage with some algae. Occasionally, there would be oohs and aahs over something other than sand and sea weed: sea stars, large sea cucumbers, sponges, sea urchins or the infrequent fish. I really enjoy watching real time video of previously unseen seafloor, but I found myself falling asleep on my feet. I finally had to give up and head to the bunk.
Right: Steve & Viv prepare the TOAD for launch.
Today, we are near Saipan planning to do BRUV work during the day and the TOAD tonight. A nap might be a good plan so I can watch the TOAD through the night, but I don’t want to miss the BRUV action either.
Sunday, March 7, 2010
I AM HAPPY!! and everyone on this ship knows it. Fish 250 was removed from the internet for over 24 hours. I tried to keep a good attitude. I spent the better part of 3 weeks working on this blog. I was able to interact with most of my Guam students via the blog during that time. That was great, but, "I wasn't done!" We came back up this morning and I was dancing in the e-lab. I should be glad I was shut down because coming back up has made me so happy.