Thursday, January 7, 2010

A wee bit rocky today. We have a swell that seems to be coming from the starboard (right) aft quarter, which gives the ship a strange movement that has made some of the folks a little queasy. Ships tend to roll (movement around an imaginary line running bow to stern) pitch (movement up and down around an imaginary line running 90 degrees to the direction of roll) and yaw (movement left or right of the imaginary line running bow to stern). Today the KA is doing all three at the same time which is why we are encouraged to take Meclizine HCL (Dramamine) for a few days prior to the trip and for the first few days at sea. Taking this makes it easier for the crew to function in an environment that has un-natural motion without getting ‘seasick’. Even with the weird motion of the ship, we still have work to do and for us “newbies” things to learn before we are allowed to do them,
like learn how to set the ‘painter line’ for the RHIB so that we will stay attached to the ship in the advent that the engine of the RIHB doesn’t start or other various bad things that can happen to a little boat in a big ocean. We didn’t actually ride in the RHIB today, we simply learned how to enter the boat, where to sit , where the emergency items are located, and how to start and steer the boat.



One of the tasks that needs to be done prior to the deployment of our first Buoy at 8N:155W is to determine (as close as possible) the ideal position for the buoy’s anchor. To do this it is essential to know the true depth of the ocean and the topography (collectively called bathymetry) of the area within a few miles of the target latitude and longitude for the buoy. Brian, our Chief Scientist, will determine the depth and location for the anchor by using both satellite sea surface heights and actual sonar depth data from ships that have been in the area. In reality, there really isn’t much

hard data, physical sonar tracks, for much of the ocean and much of the depth is determined by the actually height of the sea surface as measured by satellite. These measurements take into account variables, such as orbit of the satellite, atmospheric effects on radar, and tides and compare the computer result to a mathematical ellipsoid model of the Earth’s shape. Sounds pretty complicated, and it is, but we can use this calculated sea surface to help determine the depth of the ocean since the surface mirrors the actual topography of the ocean floor. For Academy students, you will have the opportunity to do two activities from the American Meteorological Society (AMS) that will help you understand what it is that we are attempting to do.





For the fishermen out there, we caught our first fish this cruise. A Wahoo (Hawaiian's call this fish Ono which means "good" because it is a good fish to eat. Some of the crew have been putting out troll lines off the fantail of the ship with the hope that some hungry fish might see the lure as a treat they are unable to resist. I guess we don't have to go home skunked now.









One last comment from Rick, my school has a set of four computer monitors in the hall outside of my classroom thanks to Mr. Beals. The Earth Science department puts up content relevant sites for the kids to see as they pass from room to room. Typically we would have the weather (which I hear has been bitter) some current earthquake data from our own seismograph and other content sites that relate to the current teaching units. Thank you Senior High Academy for giving me the opportunity to be on the screen in the hall.

Rick

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