July 2009 – Page 2 – NOAA Teacher at Sea Blog

July 28, 2009April 6, 2021

Kathryn Lanouette, July 28, 2009

NOAA Teacher at Sea
Kathryn Lanouette
Onboard NOAA Ship Oscar Dyson
July 21-August 7, 2009

Here I am sorting different zooplankton species

Mission: Summer Pollock Survey
Geographical area of cruise: Bering Sea, Alaska
Date: July 28, 2009

Weather Data from the Ship’s Bridge
Visibility: 8 nautical miles
Wind direction: 015 degrees (N, NE)
Wind speed: 7 knots
Sea wave height: 1 foot
Air temperature: 7.6˚C
Seawater temperature: 7.3˚C
Sea level pressure: 29.8 inches Hg and falling
Cloud cover: 8/8, stratus

Science and Technology Log

In addition to studying walleye pollock, NOAA scientists are also interested in learning about the really tiny plants (phytoplankton) and animals (zooplankton) that live in the Bering Sea. Plankton is of interest for a two reasons. First, phytoplankton are the backbone of the entire marine food chain. Almost all life in the ocean is directly or indirectly dependent on it. By converting the sun’s energy into food, phytoplankton are the building blocks of the entire marine food web, becoming the food for zooplankton which in turn feed bigger animals like small fish, crustaceans, and marine mammals. Second, zooplankton and small fish are the primary food source for walleye pollock. By collecting, measuring, and weighing these tiny animals, scientists are able to learn more about the food available to walleye pollock. In addition, every time the scientists trawl for walleye pollock, the stomachs of 20 fish are cut out and preserved. Back at a NOAA lab in Seattle, the contents of these fish stomachs will be analyzed, giving scientists a direct connection between walleye pollocks’ diet and specific zooplankton populations found throughout the Bering Sea.

A simplified marine food chain (Note: A complete marine food web involves hundreds of different species.)

Two important zooplankton groups in the Bering Sea are copepods and euphausiids (commonly referred to as krill). Euphausiids are larger and form thick layers in the water column. In order to catch euphausiids and other zooplankton of a similar size, a special net called a Methot is lowered into the water. This fine meshed net is capable of catching animals as small as 1 millimeter. The same sonar generated images that show walleye pollock swimming below the water’s surface are also capable of showing layers of zooplankton. Using these images, the scientists and fishermen work together, lowering the net into the zooplankton layers.

The Methot net is the square shaped net in the background. It was just brought up and is filled with hundreds of zooplankton.

Once the Methot net is back onboard the boat, its contents are poured through fine sieves and rinsed. All species are identified. A smaller sub sample is weighed and counted. This information is applied to the entire catch so if there were 80 krill, 15 jellyfish, and 5 larval fish in a sub sample, then scientists would approximate that 80% of the entire catch was krill, 15% was jellyfish, and 5% was larval fish. Having only seen photos of some of these zooplanktons, it was interesting to hold them in my hands and look at them up close. They seemed better suited for space travel or a science fiction movie than the Bering Sea!

Personal Log

The day before, I caught my first glimpse of Dall’s porpoises. This pod of porpoises came swimming alongside the boat. It was awesome to see their bodies rise and fall in the water. I was surprised at how quickly they were swimming, darting in and out of the Oscar Dyson’s wake. Today, I also got my first glimpse of a whale! It was a fin whale, a type of baleen whale, about 20 meters from the boat. It was exciting to watch such a large mammal swimming in such a vast expanse of water. I’m hoping to see a few more marine mammal species before we return to port. The seas have been very calm for the last five days, at times as smooth as a mirror. I’m surprised that I’ve gotten used to falling asleep in the early morning hours and waking around midday. Now that I’ve adjusted to the 4pm to 4am shift, I’m wondering how strange it will be to return to my regular schedule back on the east coast.

Answer to July 25^th Question of the Day: Why are only some jellyfish species capable of stinging?
As I picked up my first jellyfish in the wet lab (asking at least twice “Are you sure this won’t sting?”), I wondered why some jellyfish don’t sting. So I did some reading and asked some of the scientists a few questions. Here is what I found out: All jellyfish (called “gelatinous animals” in the scientific world) have stinging cells (nematocysts) in their bodies. When a nematocyst is touched, a tiny barb inside fires out, injecting toxin into its prey. It seems that in some jellyfish, the barbs are either too small to pierce human skin or that nematocysts don’t fire when in contact with human skin.

One euphausiid and two different species of hyperiid amphipod (They are between 1-3 cm long) — One euphausiid and two different species of hyperiid amphipod

Animals Seen
Capelin, Dall’s porpoise, Euphausiid, Fin whale, Hyperiid amphipod, and Slaty-backed gull.

New Vocabulary: Baleen whale – a whale that has plates of baleen in the mouth for straining plankton from the water (includes rorqual, humpback, right, and gray whales). Methot net – a square framed, small meshed net used to sample larval fish and zooplankton. Phytoplankton – plankton consisting of microscopic plants. Plankton – small and microscopic plants and animals drifting or floating in the sea or fresh water. Trawl – to fish by dragging a net behind a boat. Zooplankton – plankton consisting of small animals and the immature stages of larger animals

Question of the Day: How has the walleye pollock biomass changed over time?

July 27, 2009April 5, 2021

Jennifer Fry, July 27, 2009

NOAA Teacher at Sea
Jennifer Fry
Onboard NOAA Ship Miller Freeman (tracker)
July 14 – 29, 2009

Mission: 2009 United States/Canada Pacific Hake Acoustic Survey
Geographical area of cruise: North Pacific Ocean from Monterey, CA to British Columbia, CA.
Date: July 27, 2009

The CTD, resembling a giant wedding cake constructed of painted steel, measures the composition of the water, salinity, temperature, oxygen levels, and water pressure.

Weather Data from the Bridge
Wind speed: 13 knots
Wind direction: 003°from the north
Visibility: clear
Temperature: 13.6°C (dry bulb); 13.2°C (wet bulb)
Sea water temperature: 15.1°C
Wave height: 1-2 ft.
Swell direction: 325°
Swell height: 4-6 ft.

Science and Technology Log

Each night beginning at around 9:00 p.m. or 21:00, if you refer to the ship’s clock, Dr. Steve Pierce begins his research of the ocean. He is a Physical Oceanographer and this marks his 11^thyear of conducting CTD, Conductivity, Temperature, and Density tests.

It takes 24 readings per second as it sinks to the seafloor. The CTD only records data as it sinks, insuring the instruments are recording data in undisturbed waters. For the past 11 years Dr. Pierce and his colleagues have been studying density of water by calculating temperature and salinity in different areas of the ocean. By studying the density of water, it helps to determine ocean currents. His data helps us examine what kind of ocean conditions in which the hake live. Using prior data, current CTD data, and acoustic Doppler current profiler, a type of sonar, Dr. Pierce is trying to find a deep water current flowing from south to north along the west coast. This current may have an effect on fish, especially a species like hake.

This map illustrates part of the area of the hake survey.

Dr. Steve Pierce reminds us, “None of this research is possible without math. Physical oceanography is a cool application of math.” Another testing instrument housed on the CTD apparatus is the VPR, Visual Plankton Recorder. It is an automatic camera that records plankton, microscopic organisms, at various depths. The scientists aboard the Miller Freeman collect data about plankton’s feeding habits, diurnal migration, and their position in the water column. Diurnal migration is when plankton go up and down the water column to feed at different times of day (see illustration below). Plankton migration patterns vary depending on the species.The scientists aboard the Miller Freeman followed the east to west transect lines conducting fishing trawls. The first one produced 30 small hake averaging 5 inches in length. The scientists collected marine samples by weighing and measuring them.

Dr. Steve Pierce at his work station and standing next to the CTD on a bright sunny day in the Northern Pacific Ocean.

This illustration depicts the diurnal migration of plankton.

Personal Log

It was extremely foggy today. We traversed through the ocean evading many obstacles including crab and fishing buoys and other small boats. Safety is the number one concern on the Miller Freeman. The NOAA Corps Officers rigorously keep the ship and passengers out of harm’s way. I am grateful to these dedicated men and women. LTjg Jennifer King, marine biologist and NOAA Corps officer says, “Science helps understand natural process: how things grow and how nature works. We need to protect it. Science shows how in an ecosystem, everything depends on one another.”

July 26, 2009April 5, 2021

Jennifer Fry, July 26, 2009

NOAA Teacher at Sea
Jennifer Fry
Onboard NOAA Ship Miller Freeman (tracker)
July 14 – 29, 2009

Mission: 2009 United States/Canada Pacific Hake Acoustic Survey
Geographical area of cruise: North Pacific Ocean from Monterey, CA to British Columbia, CA.
Date: July 26, 2009

Weather Data from the Bridge
Wind speed: 10 knots
Wind direction: 100° [from the east]
Visibility: fog
Temperature: 13.5°C (dry bulb); 13.5°C (wet bulb)
Sea water temperature: 10°C
Wave height: 1ft.
Swell direction: 315° Swell height: 6 ft.

Science and Technology Log

We conducted a number of HAB, Harmful Algal Bloom sample tests. The Harmful Algal Bloom test takes samples at predetermined location in our study area. The water is filtered to identify the presence of toxic plants (algae) and animals (zooplankton). The plankton enter the food chain specifically through clams and mussels and can be a possible threat to human health.

We also conducted XBTs, Expendable Bathythermograph; and one fishing trawl net. The trawling was successful, catching hake, squid, and Myctophids. Fishery scientist, Melanie Johnson collected specific data on the myctophids’ swim bladder. The swimbladder helps fish regulate buoyancy. It acts like a balloon that inflates and deflates depending on the depth of the fish. Sharks on the other hand have no swim bladder. They need to swim to maintain their level in the water. Marine mammals such as dolphins and whales have lungs instead of a swimbladder. Most of the sonar signal from the fish comes from their swimbladder. The study of the swimbladder’s size helps scientists determine how deep the fish are when using the sonar signals and how strong their sonar signal is likely to be.

Commander Mike Hopkins, LTjg Oliver Brown, and crewmember John Adams conduct a marine mammal watch on the bridge before a fishing trawl.

The scientists tried to conduct a “swim through” camera tow, but each time it was aborted due to marine mammals in the area of the net. During the “Marine Mammal Watch” held prior to the net going in the water, we spotted humpback whales. They were observed breeching, spouting, and fluking. The humpback then came within 30 feet of the Miller Freeman and swam around as if investigating the ship.

Animals Seen Today
Fish and animals trawled: Hake, Squid (Cephalopod), and Myctophids.
Marine Mammals: Humpback whale.
Birds: Albatross, Fulmar, and Shearwater.

July 26, 2009April 5, 2021

John Schneider, July 21-26, 2009

NOAA Teacher at Sea
John Schneider
Onboard NOAA Ship Fairweather
July 7 – August 8, 2009

Mission: Hydrographic Survey
Geographical Area: Kodiak, AK to Dutch Harbor, AK
Date: July 21-26, 2009

Position
In port, Dutch Harbor, AK

Personal Log

The days we spent in Dutch Harbor were a combination of 8-hour work days and evenings spent in town at either the Harbor View Sports Bar and Grill or the Grand Aleutian Hotel. The crew and survey techs put in full days, then go out for a couple of hours using the liberty van. Everyone’s usually back aboard by midnight or so (the van stops running at 2300, but the town’s only about a 20 minute walk.) In Dutch and Unalaska, there are houses of worship, museums, a Safeway, a clinic (which I got to visit / after stepping on a nail), a community indoor pool and a post office. There are also a couple of ship supply places that have excellent quality gear at a minimum markup considering how far away we are.

For me, there were four events that were particularly of note. First, before now I had only ever seen one bald eagle in the lower 48 and a half dozen or so in Kodiak. In Dutch, they are all over. These birds get to be about 3 feet tall and the talons on the juvenile pictured are about an inch long! I took well nigh 100 pictures and had trouble selecting which ones to include. They are stunning animals.

Second, I knew that Dutch Harbor had been bombed by the Japanese in WWII as part of the diversionary action prior to the Battle of Midway. What I never realized was WHY they would bomb a remote, nothing, minor outpost and attack and occupy Attu and Kiska farther out in the Aleutians. The answer lies in spheroid geometry! (OK all you math phobes, this is a cool one that’s not too hard to grasp.) Simply put, the shortest distance between any two points on a sphere (the Earth) is the distance along the surface created by a plane created by three points: the two points in question and the center of the sphere. In other words, it cuts the planet in half! (The red line in the illustration.)

Great circle rout from Tokyo to Seattle — Great circle route from Tokyo to Seattle

Spheroid geometry (diagram courtesy USNA)

On the diagram above, the red line is the great circle route from Tokyo to Seattle. As you can see it passes right through the Aleutians. The battle in the Aleutians is sometimes referred to as the “Thousand Mile War” and is largely unknown, However, the Aleutian Islands are the “back door” to attacking North America. That’s why, after the bombing of Dutch Harbor six months after Pearl Harbor, the United States made a concerted effort to fortify the Aleutians and take back Attu and Kiska. By the way, the landings on Attu and Kiska were the first landings on American soil by an enemy since the War of 1812! There are reinforced concrete bunkers and Quonset huts all over the Dutch Harbor area and the fortifications atop Mount Ballyhoo are among the most well-preserved and extensively built in the United States. The fact that our military – both men and women – were stationed in such an inhospitable frontier should be taught to all of our students.

Personally, I am thankful to one of my professors, Jack Lutz, who was stationed on Adak, 350+ miles West of Dutch Harbor. Freedom isn’t free and we are very lucky. So, this information about great circles should lend a bit of insight to the questions I posed earlier about the D.E.W. Line (used for radar protection in the event of Soviet missile launch over the North Pole) and why we encountered ships sailing from North America to Asia while passing through Unimak Pass (It’s right in the middle of the great circle route!)

Gun emplacement overlooking the entrance to Dutch Harbor

On our last day in Dutch, the CO and 5 others including myself went to the old cemetery in Unalaska. Buried there is Karl Mueller of the U.S. Ship Surveyor. He was one of the earliest Americans to work on surveying the Aleutians and was drowned in 1938 when his survey launch hit a previously uncharted reef. For more information on the NOAA personnel lost in the line of duty, go here. It’s important that we know our history in order to appreciate our present and look forward to the future.

Grave marker of Karl Mueller. The Fairweather crew maintains the grave and established a benchmark on the marker.

The last notable event in Dutch was the combined “wetting down” and Sunday Brunch for the new officers. As I pointed out on one of my first logs, CO Doug Baird was promoted to Captain and Mark Andrews was promoted to Lieutenant JG. LTjg Andrews generously invited me to the wetdown and brunch which was attended by the entire crew. The wetdown was at the Grand Aleutian on Saturday night and Sunday brunch was there also. These two events were really something special and the camaraderie was great to experience. Thank you, sirs.

Crab legs, lox, salmon, biscuits w/ crab gravy, kippers (Plate #2 with dessert yet to come!) — Crab legs, lox, salmon, biscuits w/ crab gravy,
kippers (Plate #2 with dessert yet to come!)

July 25, 2009April 5, 2021

Jennifer Fry, July 25, 2009

NOAA Teacher at Sea
Jennifer Fry
Onboard NOAA Ship Miller Freeman (tracker)
July 14 – 29, 2009

Mission: 2009 United States/Canada Pacific Hake Acoustic Survey
Geographical area of cruise: North Pacific Ocean from Monterey, CA to British Columbia, CA.
Date: July 25, 2009

Weather Data from the Bridge
Wind speed: 10 knots
Wind direction: 355°from the north
Visibility: fog
Temperature: 11°C (dry bulb); 10°C (wet bulb)
Sea water temperature: 9.2°C
Wave height: 2 ft.
Swell direction: 310°
Swell height: 5 ft.

Science/Technology Log

Three fishing trawls were conducted today. We took biological samples from the hake collected. The following is a list of other fish retrieved:

Octopus: 1
Squid: 47
Glass shrimp: 50
Shrimp (another species): 3
Bird observations: Many bird species are seen around the boat each time there is a fishing trawl net. They range in size and flying pattern. Here are a few of them.
Black-footed Albatross (Phoebastria nigripes): Mostly dark in all plumage, or feathers; White undertail and white may be on belly; Range: Seen around the year off west coast in spring and summer; Winters in Hawaii.

While observing the albatross and fulmar fly, I noticed that they glide gracefully across the waves gently touching the tip of their wing into the water. During take off, the albatross uses his giant webbed feet to push off by “running” on the surface of the water. Similarly during landing; his feet appear to “run” on the water which seems to slow him down.

Sooty Shearwater (Puffinus griseus): Whitish underwing contrasts with overall dark plumage; Range: breeds in southern hemisphere; Abundant off west coast, often seen from shore.

Pink-footed Shearwater (Puffinus creatopus): Blackish-brown above; white wing underparts, a bit mottled; Range: spends summers in northern Pacific; winters in Chile — Pink-footed Shearwater (P. creatopus): Blackish-brown; white wing underparts, a bit mottled; Range: spends summers in northern Pacific; winters in Chile

Northern Fulmar (Fulmarus glacialis): Gull-sized seabird; rapid wingbeats alternating with gliding over waves; color is rather uniform with not strong contrasts; gray overall with whitish undersides; range: Northern Pacific Ocean and Northern Atlantic Ocean; Breeds: Aleutian Islands, Alaska.

Fun on-line NOAA activities such as Make your own Compass, Tying Knots, Learn about Nautical Charts, Be a Shipwreck detective, and Make a tornado in a bottle.

Commander Mike Hopkins overlooks the North Pacific Ocean just off the Oregon Coast from the bridge. His job is to make sure everything aboard the Miller Freeman is running smoothly.

NOAA Commissioned Corps Officers are a vital part of the National Oceanic and Atmospheric Administration (NOAA). Officers provide support during NOAA missions ranging from launching a weather balloon at the South Pole, conducting hydrographic or fishery surveys in Alaska, maintaining buoys in the tropical Pacific, flying snow surveys and into hurricanes. NOAA Corps celebrates its 202^nd birthday this year.

Animals Seen Today
Fish and other trawled animals: Hake, Octopi, Squid, and Shrimp.
Birds: Fulmar, Shearwater, Albatross, and Gulls.