Dave Grant: Sea State, Sick Bay and Longitude, February 26, 2012

February 15 – March 5, 2012

Mission: Western Boundary Time Series
Geographical Area: Sub-Tropical Atlantic, off the Coast of the Bahamas
Date: February 26, 2012

Weather Data from the Bridge

Position: 26.30N Latitude – 71. 55W Longitude
Windspeed:  15 knots
Wind Direction: South (bearing 189 deg)
Air Temperature: 23.2 C / 74 F
Atm Pressure: 1013.9 mb
Water Depth: 17433 feet
Cloud Cover: 30%
Cloud Type: Cumulus

Sea State, Sick Bay and Longitude

“Now would I give a thousand furlongs of sea
for an acre of barren ground.”
Shakespeare – The Tempest.

There is considerable excitement on board since the winds have come up; adding to the work load of the deck crew and scientists struggling to snag the mooring buoy and haul in the miles of cable and sensors that are arrayed below. With swells arriving from two directions and wind chop on top of that, the ship’s motion is unpredictable. So there is no room for error above or below the waterline and the heaving of the ship and spray mean everyone must be alert and ready to respond instantly if anything swings loose.

We are “line-sailing” on this cruise, steaming back-and-forth while maintaining a straight course on Latitude 26.30; deploying and servicing various sampling devices on the electronic “picket fence” dividing the Atlantic. Watching the deck crew cutting heavy wire and even heavier  chain, banging on metal,  wrestling with equipment and sweating under the sun all day as they back-track along the same line doing back-breaking work, I can almost hear them singing an old Mississippi Delta field holler – Line ‘em:

“All I hate ’bout linin’ track
These ol’ bars ’bout to break my back
Moses stood on the Red Sea shore
Smotin’ that water with a two-by-four
If I could I surely would
Stand on the rock where Moses stood”

Line-sailing is also an old technique used when mariners could only accurately determine their latitude North or South of the equator by means of the sun and stars. Simply stated, one would sail North or South to the known latitude of a destination, then sail East or West until it was found.

The Polynesians perfected this – line-sailing the latitude of specific stars that they knew had islands beneath them. On clear nights we go out on the shadowy deck, so far away from the glare of lights on land, and marvel at the great spectacle of stars. The two brightest above us are Arcturus and Sirius – known to the Polynesians as Hōkūleʻa (Star of Joy) and Ka’ulua (Queen of Heaven). Navigators steered under Arcturus to reach Hawaii, and returned to Tahiti by sailing under Sirius.

Tahiti lies under Sirius, and Hawaii under Arcturus, providing navigators with bright sign posts to guide them to those jewels in the vast Pacific. From the deck on the Ron Brown it looks like our zenith star could be Pollux, one of twins in Gemini. This seems appropriate  “By Jiminy”  for good luck,  since early sailors swore an oath to those Twins – the protectors of ships.

Still, Longitude remained a problem because its measure is the time East or West from a fixed point –Greenwich, England and the Prime Meridian. Until accurate ship’s chronometers were perfected, navigators had to rely on repeated estimates of their speed and direction – Dead Reckoning.

Since early clocks relied on a pendulum and inferior materials, and the challenge of perfecting an accurate timepiece became apparent to me while weighing-in at Sick Bay. The roll of the ship has that up-down effect you feel in an elevator, and your weight on the scale fluctuates accordingly. (Mine swings between 165 and 225 pounds, depending on the size of the swells; so I’ll have to wait until we reach port for more accuracy.) Navigators had to wait until 1764 when watchmakers finally perfected sturdy, spring-powered and rust-resistant chronometers accurate enough to satisfy the British Admiralty to guide ships across the featureless ocean waters. Incidentally, William Harrison’s chronometer was hardly portable. It weighed 85 pounds (!).

I am going to try two experiments later. One, fashion a simply pendulum and see how the ship’s rocking affects it, and two, try some dead reckoning to determine current speed.

(Interesting coincidences: My office at work is in the shadow of Sandy Hook Lighthouse, the entrance to NY Harbor. This important beacon is the oldest continuously lit lighthouse in America – and first lighted in 1764 (!). Also, with the perfection of wireless communication;  in 1904, the US Navy established the first radio station to continuously broadcast the time for navigators to set their ship’s chronometers – at Navesink, NJ,  across Sandy Hook bay and within the sight of my office window.)

A Biologist’s Bouillabaisse

With the help of Danny, one of the ship’s engineers, I have struck gold sampling marinelife. He alerted me to the intake screen for sea water that he was removing to clear and I was able to sort through it. It is a bonanza, as you can see in the image.

Although most of the material is Sargassum weed, and some bits of plastic, there is a great assortment of material here to keep me busy for the rest of the day. I will start from the bottom. Besides the sargassum, there is other plant material swept here from shallow water. Sea grasses from around the islands support turtles and a thriving subtidal community. One colleague in Puerto Rico thinks that these meadows are as productive as an ecosystem in the ocean. Not obvious is the Aufwuchs community covering the grass blades, but under the microscope, one piece is enough to keep a class busy for hours identifying the specimens in this “fouling community.”


Bryozoa, worm tubes and coralline algae cover a slender blade of grass.


A tiny drifting animal from the surface, the Cnidarian – By-the-wind Sailor.

Perched on my fingertips, a larval crustacean ready
to drop out of the planktonic community.

A tiny larval crab viewed under the microscope (20 x’s)

An amphipod shrimp.

A Polychaete worm. One of the many annelids in the sample.
Not everyone’s favorite, unless of course, you are a fish.

Obed Fulcar, July 21, 2010

NOAA Teacher at Sea Obed Fulcar
NOAA Ship Oscar Dyson
July 27, 2010 – August 8, 2010

Mission:Summer Pollock survey III
Geograpical Area:Bering Sea, Alaska
Date: July 21, 2010

Weather from the Bridge:
Time: 0345 pm
Latitude: 57.23 degrees North
Longitude:173.33 degrees West
Wind: 12 knots
Direction: 257 degrees West
Sea Temperature: 8.5 degrees C
Air Temperature: 8.85 degrees C
Barometric Pressure: 1020.0 mb
Skies: Partly Sunny

Science and Technology Log:

Buddy Gould
Buddy Gould

Yesterday, Tuesday July 20, we finally left Dutch harbor, once all the delayed scientific equipment arrived. I was later told that it included some new and sophisticated technology to track and measure fish underwater. We climbed up to the “flying bridge” at the very top of the ship to see the view of Dutch harbor behind us and the open ocean ahead. After that we came down to the bridge where Acting Executive Officer XO Sarah Duncan, Ensign Amber Payne, and Buddy Gould from the Deck Department gave us a tour of the bridge. They explained that the panels of navigational instruments used to sail the ship included Radar screens, to detect any vessels or ships in the proximity, one for long range, and another for short range, showing any ships close by. The screens show the many readings from instruments on board such as wind speed (in knots), Wind direction (in degrees), Latitude, Longitude, and Air Pressure (in millibars).

Navigational Instruments
Navigational Instruments

Next we received a demonstration in how to chart a course using the Electronic chart. I was surprised to understand the navigational terminology, (Iguess my Basic Sailing class is paying off), such as true wind, leeward, aft, forward, et…
I asked if they still used paper Nautical Charts and the answer was yes, they use them to plot the course of the ship using pen, ruler, and compass. I was surprised to know that even with all this technology even though the ship course and navigation is done completely electronically, they still rely on pen and paper charts as back up! On the bridge were also two scientists fro the US Fish and Wildlife service working on Seabird research, as part of the Bering Sea Integrated Ecosystem Project, a multidsciplinary study that is looking at how climate change is affecting the ecosystem of the Bering Sea. liz and Marty were both working from the bridge with binoculars, observing and counting all seabirds within 300 meters from the ship. armed with a laptop computer connected to the ship’s navigational system they were able to count and input the GPS location (latitude/longitude) of every sighting of a seabird, and plot a GIS graph in real time. I found this to be really cool! We saw seabirds found on the Bering sea such as Black-footed Albatross, Northern Fulmar, Tufted/Horned Puffin, Fork-tailed Storm Petrel, and Thick-bill Murre.

Personal Log:
Today is Day 4 of the mission and so far I have done pretty well in terms of motion sickness. A calm sea has been a great factor and has allowed me to get adjusted to life at sea. I am surprised to find myself at home in my my bunk bed, and haven’t had any difficulties sleeping at all, though I do miss my bed. The long schedule from 0400 to 1600 (4pm) full of activities has been of help keeping me busy. The food is great thanks to Floyd the master cook with a variety of international food and home baked pastries. I was also impressed by the international collaboration in this mission, with two Russian scientists on board conducting research on the fisheries of the Bering Sea since part of the transects or line passess done by the Oscar Dyson cover Russian territorial waters as well.
New Vocabulary Words;
Nautical charts, Radar, Latitude, Longitude, GPS (Global Positioning Satelite), Leeward (opposite to wind), Forward (front of ship), Aft (back of ship)

Animals seen today:
Black-footed Albatross, Northern Fulmar, Tufted/Horned Puffin, Fork-tail storm Petrel, Thick-bill Murre
Bitacora Marina #2: Ayer martes, 20 de Julio finalmente zarpamos hacia alta mar. Los oficiales del Oscar Dyson nos dieron un tour del puente explicandonos los sofisticados instrumentos de navegacion electronica como Radares, sonar acustico, y sistema global de ubicacion por satelite (GPS).A pesar de tanta tecnologia, todavia se grafica el curso de la nave usando Cartas Marinas, compas y lapiz!Tambien me presentaron a una pareja de biologos del Servicio de Pesca y Caza de los EEUU, haciendo un conteo de las aves marinas del Estrecho de Bering, graficando en tiempo real cada observacion en un ordenador laptop usando tecnologia GIS, o sistema de informacion geografica.