NOAA Teacher at Sea
Cathrine Prenot
Aboard Bell M. Shimada
July 17-July 30, 2016
Mission: 2016 California Current Ecosystem: Investigations of hake survey methods, life history, and associated ecosystem
Geographical area of cruise: Pacific Coast from Newport, OR to Seattle, WA
Date: Thursday, July 29, 2016
Weather Data from the Bridge
Lat: 4901.93N (We’re in Canada!)
Lon: 12651.64W
Speed: 5.7 knots
Windspeed: 34.2 deg/knots
Barometer: 1018.10 mBars
Air Temp: 15.0 degrees Celsius
Water Temp: 13.92 degrees Celsius
Science and Technology Log
Panoramic view of the back deck of the Bell M. Shimada from the wet lab.
There is a book on the bridge of most sailing vessels called “The American Practical Navigator.” Most people call it Bowditch, for short. It is a thick tome, and has an insane wealth of information in it, as Nathanial Bowditch vowed to “put down in the book nothing I can’t teach the crew.” He evidently thought his crew could learn anything, as Bowditch is an encyclopedia of information. You can find distances to nearby planets, how magnetic fields change around iron vessels, what to do if you are lost at sea, what mirages are, and rules to navigate around hurricanes. It’s been updated multiple times since Bowditch’s version in 1802, but one fact has remained. There is math—oodles and oodles of geometry and algebra and calculus—on every page. In fact, a lot of the Bell M. Shimada runs on math—even our acoustic fishing is all based on speed and wavelengths of sound.
Screenshot from the Bell M. Shimada’s Acoustics Lab showing the visual rendition (left to right) of 18,000Hz, 38,000Hz, and 120,000Hz. The ocean floor is the rainbow wavy line 250-450meters below. This was transect #38; we fished the red/orange splotches approx 150 meters deep. They were all hake!
Sonar was first used in World War I to detect submarines, and began to be used to sense fish soon after the war ended, with limited success. Sonar advanced rapidly through World War II and fishermen and scientists modified surplus military sonar to specifically detect ocean life. Since sound will bounce off “anything different than water,” we can now use different frequencies and energy to determine an incredible amount of information on a fish’s life. We can “try to tell what kind of fish, where they are, map vertically what they do, and determine their density.” The chief scientist, Dr. Sandy Parker-Stetter says it best. “My job is to spy on fish.” In my opinion, Sandy seems good enough to be in the Acoustics CIA. Click on Adventures in a Blue World; Why Math Matters, to learn all about fish spying and other reasons you should pay attention in algebra class.
Adventures in a Blue World, CNP. Why Math Matters.
Personal Log
Life onboard continues to be interesting and fun. The wind has picked up a bit, which has translated into higher seas. I tried to film the curtains around my rack last night opening and closing of their own accord, but every time I’d pick up the camera, they’d stop. I did get a few seconds of some wave action outside the workout room; riding a bike is now much easier than running on the treadmill. Pushups are insanely easy when the ship falls into the waves, and ridiculously difficult when rising.
Porthole video.
I’ve also been involved in a chemical spill drill (that does say drill), and was lucky to be given the helm for a brief moment on the Bell Shimada.
Staging a chemical spill for the crew’s spill drill
Prenot at the Helm
Did You Know?
NOAA has been around since 1970! Thanks to our great Survey Tech Kathryn Willingham for keeping our science team working so seamlessly. Well… …and making it fun too.
Kathryn Willingham
Resources:
Ocean frequencies: explore sound in the ocean.
Check out this great TED talk about the importance of mathematics at sea.
