channel islands national marine sanctuary – Page 2

NOAA Teacher at Sea

Sarah Raskin

Aboard NOAA Ship Bell M. Shimada

March 13-18, 2015

Mission: Channel Islands Deep-Sea Coral Study

Geographic Area: Channel Islands, California

Date: March 16, 2015

Day 4: Monday 3/16/15

The visiting sonar technician left this afternoon on NOAA’s Shark Cat boat after working diligently to fix the ship’s sonar system throughout the past few days. As of now, the ME 70 sonar is up and running. This equals exciting news for the sonar team that has been waiting patiently to begin their projects. The Shimada actually has two sonar machines; one works with a single beam, while the other, the ME 70 has multiple beams that can cover a much greater amount of territory in the same amount of time.

How does sonar work?

Sonar technology is a way for us to create images of what is below the surface of the ocean. The sonar system, which is attached to the bottom of the ship, sends out an acoustic signal towards the ocean floor and then measures how long it takes for the sound to bounce back to the boat. By measuring this, the sonar creates a picture of the depth of the ocean floor in that area.

Mike and Will look at data generated from the sonar system

A secondary measurement that is also occurring when the sonar machine is running is called backscatter. Backscatter measures the intensity, or loudness, of the sound as it echoes back to the ship. The softer the sound when it reflected back means the softer the type of surface it is bouncing off of, such as sand. The louder and more severe the sound is equates to a harder surface floor, such as rocky ledges. As Andy explained to me, think about bouncing a ping-pong ball on a carpet vs. hardwood floor. The ping-pong ball will have a much stronger bounce off of a hard surface v. a softer one. Will also explained that based on the backscatter sound we can determine fine details such as whether the sand is fine or coarse.

Simrad ME70, Scientific multibeam echo sounder

Both of these sonar features create an image of what the ocean floor looks like, its physical features, habitat types and any potential hazards that may exist below the surface. This is critical for creating nautical charts and it is also important for the navigation of the ROV, so it doesn’t stumble upon any unexpected obstacles while traveling underwater.

Shimada seamount — An example of an image created by the sonar system

Another feature that sonar is used for on this ship is to measure fish abundance. The sound waves travel down and bounce off of the fishes’ swim bladders. Swim bladders are gas filled bladders found in many fish that helps them stay buoyant. Using this method, scientists could use sonar to gauge fish populations, instead of catching fish to see what is out there.

An example of an image created by the sonar system — Scientists looking at sonar screens

So far in the trip, Laura Kracker and her team (Mike Annis, Will Sautter and Erin Weller) have been using the working sonar to map fish populations in the area. Tonight, however, they will use the ME 70 for a test run to map out areas of the Channel Islands National Marine Sanctuary that have never been mapped before! This data could be used to create brand new nautical maps, to help scientists have a better idea of what the hidden part of our sanctuary looks like and to determine which regions might be best habitats for fish or coral. Tomorrow, the ROV team will send the ROV to the sites that were mapped the previous night to check out features that were discovered on the seafloor and to explore the newly mapped regions.

The sonar team hard at work (from left Mike, Will, Laura, Erin)

Life at Sea

When setting out on this journey, students asked me what life would be like living on a ship. I spoke with several of the crew members on the ship about what it is like to be out at sea for days at a time. So here is an image of what it has been like so far, from the perspective of some of the crew and from my own experiences:

NOAA Ship Bell M. Shimada — The *Bell M. Shimada* by the Channel Islands

The Bell M. Shimada is an enormous ship, over 200 feet in length. I have been here for four days now and still have not explored the entire place! The ship is approx. six stories tall, though on the ship they refer to the different levels as decks, not stories. The Shimada is run from a platform on the third deck, known as the bridge. The steering of the ship takes place from the bridge and there is always an assigned lookout person, whose job is to look out the windows to see what is going on around the ship. The bridge is also equipped with radars that can detect boat traffic or other obstacles.

A lot of communication goes back and forth between the scientists in the ROV command room and the bridge. The bridge must ensure that the ship stays steady and follows the ROV during its dive. If the ship moves too much it can yank the ROV around or the cables from the ROV could get caught or damaged under the ship.

Andy and CO — Andy shows our Commanding Officer how to operate the ROV

The areas where we sleep on the ship are called staterooms. Almost all of them consist of bunk beds and have a toilet and shower area. I am rooming with Erin, one of the scientists working on the sonar mapping project. Erin and her team work during the night after the ROV runs, so typically she is going to bed shortly before I wake up for the day. We have both been working hard to stay quiet enough to let each other catch up on our sleep!

The Shimada has many features that I was not expecting on a ship, such as an exercise room equipped with treadmills and weights. We even have Internet access here! Another unexpected feature is the lounge/ theater room that is across the hall from my stateroom. It has plush reclining chairs, a huge flat screen TV, and all the DVDs you could ever hope to watch, including the newest movies.

When talking with the crew about what they love most about their jobs, many of them referred to how being part of a NOAA boat allows them incredible travel opportunities. One person I spoke with has been to 52 different countries throughout his career with NOAA! Another benefit of a maritime career such as this is that NOAA pays for part of your education. It requires special schooling and credentials to be able to be an engineer or commanding officer on a ship, and NOAA helps offset those costs. One of the biggest challenges of the job, however, is being away from family and friends for such long periods of time. Some of the crew explained to me that they may be out at sea for 30 days at a time, sometimes even longer.

One great perk to life aboard is the food. Two chefs prepare all of the meals on the Shimada for us. Similar to our lunch time at school, the meals are served at the same time each day in what is called the mess hall. If you oversleep and miss breakfast, not too worry; there is cereal and other snacks available around the clock. They serve breakfast, lunch and dinner on the ship, and we have even had the treat of fresh salads and homemade desserts!

stewards — 2C Boyd and CS Phillips preparing delicious meals

The ship stays running smoothly thanks to the help of the engineers and crew members. They work behind the scenes around the clock to keep the ship afloat.

ET and SF — Our Electronics Tech and SF Alves

My absolute favorite location on the ship is called the flying bridge. It has 3 tall chairs that look out over the ocean and an almost 360 degree view of the sea. The chairs have been used on previous excursions for scientists to sit and count marine mammals as part of their survey. It is a great place to watch the sunset from.

view from flying bridge — The view from the flying bridge

NOAA Teacher at Sea

Sarah Raskin

Aboard NOAA Ship Bell M. Shimada

March 13-18, 2015

Mission: Channel Islands Deep-Sea Coral Study

Geographic Area: Channel Islands, California

Date: March 14-15, 2015

Day 2: Saturday 3/14/15

Happy Pi Day everyone! The second day on the ship was productive and incredible. The weather was fantastic throughout the entire day, with hardly any wind and a sheet glass ocean. The stillness of the water made it easy to spot wildlife, and during the day we saw multiple pods of dolphins, sea lions, and a variety of sea birds such as cormorants and brown pelicans.

view from Shimada — A beautiful day aboard the *Bell M. Shimada* in the Channel Islands National Marine Sanctuary

dolphins — Dolphins swimming alongside the *Shimada*

The beautiful weather also made for smooth conditions to launch the ROV. The ROV took three dives today at different locations and depths each time. Peter and his team picked the locations around the Islands, staying true to spots they had visited in previous years. Part of their research involves looking at the same coral beds over the course of many years and recording what they observe and noting any changes that may have occurred. They are observing how the coral, specifically the species Lophelia pertusa, reacts to changes in pH levels and temperature. This information is important in finding indicators for how our ocean is being affected by warmer temperatures and ocean acidification.

Retrieving the Beagle ROV from its first dive of the day

So what exactly is ocean acidification?

As humans, we release carbon dioxide (CO₂) into the atmosphere and have been doing so in large quantities since the Industrial Revolution. Carbon dioxide is released during combustion, when we drive our cars, power our houses and factories, use electricity, burn things, cut down trees, etc.

The ocean acts as a sponge and absorbs about 30 percent of the carbon dioxide from the atmosphere. However, as levels of CO₂rise in the atmosphere, so do the levels of CO₂ in the ocean. This is not great news for our ocean or the organisms that make their home there. When CO₂ mixes with seawater, a chemical reaction occurs that causes the pH of the seawater to lower and become more acidic. This process is called ocean acidification.

Even slight changes in pH levels can have large affects on marine organisms, such as fish and plankton. Ocean acidification also reduces the amounts of calcium carbonate minerals that are needed by shell-building organisms to build their shells and skeletons. The damage to these shell-building organisms, including many types of plankton, oysters, coral, and sea urchins, can have a negative ripple effect throughout the entire ocean food web. An important part of the mission of this trip is to see how ocean acidification is affecting different types of deep-sea coral, such as Lophelia pertusa, that use calcium carbonate minerals to build their skeletons.

The scientists and the MARE team conducted three ROV dives throughout the day. The first dive brought up an outstanding Lophelia sample, and along with it a bizarre deep-sea creature called a basket star. Basket stars are a type of invertebrate that are related to brittle stars. Even though they feed mostly on zooplankton, they have long spindly arms that can reach to over a meter in length. It was astonishing to be able to see this alien looking creature alive and moving!

Chris and Peter — Chris Caldow and Peter Etnoyer and the basket star

Chris Caldow and Peter Etnoyer and the basket star

Day 3: Sunday 3/15/15

After long hours and a late night, the MARE team was able to get the manipulator arm on the ROV up and running, after having technical difficulties with it during the first half of our trip. This was perfect timing for the first ROV dive of the day in the waters between Santa Cruz and Anacapa Islands. The goal of this dive was to find scientist Branwen Williams a type coral known as Acanthogorgia. This coral is incredibly beautiful; tall, fan-like and golden in color.

coral and shark egg case — An Acanthogorgia with a cat shark egg case

Bombs Away: Branwen hoped to collect samples of this coral to take back to her lab for testing. She and her team of students and scientists will use these samples to ascertain how old the corals are, how fast they grow and what are they eating. Branwen explained to me that coral, similar to trees, have growth rings that can be used to determine age as well as other factors. She mentioned that when looking at age, she looks for the pattern of the “bomb curve” within the coral rings and that provides scientists with a relative date of how old the corals are. The “bomb curve” is a concentration of radiocarbon (¹⁴C) that is found in corals in every ocean in the world. The concentration of radiocarbon is a direct product of the bomb testing that took place starting in the 1950’s and produced large amounts of this radiocarbon into the atmosphere. The ocean absorbed that particular type of carbon, and in turn it was absorbed by the corals, who are suspension feeders. Suspension feeding means that corals eat by stretching their tentacles out to catch tiny particles that are floating by. So scientists identify the start and peak of the bomb testing in the radiocarbon stored in the coral skeleton to determine growth rates and then the ages of the corals. This was very shocking to me that corals in every ocean have this radiocarbon in their bodies, and clear evidence of how much human actions impact the entire globe.

team looks at samples — The team looks to see what samples have been collected

The Chief Boatswain prepares to operate the winch that will help lift the ROV out of the water

crewmembers — MARE and NOAA crew work together to make sure the ROV makes it back on board safe and sound

Diving Deep: The ROV was dispatched into the water and soon sunk to around 200 meters. As it cruised along the ocean floor the team watched as a variety of rockfish scuttled by. The ROV has two sets of lasers that shoot out in front of it, each spaced 10 centimeters apart. This gives the scientists an idea of the size of objects or organisms that pass in front of the camera.

The team located the Acanthogorgia habitat and got to work collecting samples using the manipulator arm. The manipulator arm reminds me of the claw game found in most arcades. Andy remotely operated the arm, while Dirk worked simultaneously to control the ROV. Together they were able to collect three exceptional samples, including two Acanthogorgia corals attached to hefty rocks. Each time the manipulator arm reached towards a coral, the whole crew of the Shimada held in their breath in suspense. Would the arm be able to grasp its target? The live footage from the ROV is now being streamed throughout the entire ship; in the lounges and staterooms too, so Andy and Dirk had a quite an audience cheering them on!

ROV watch party — Andy and Dirk work the controllers while Peter, Branwen and Leslie watch closely nearby

The samples made it back to the ship safely. Branwen prepared the coral to take back to the Keck Science Department of the Claremont College where she and her students will conduct their research about this little known species of coral.

Thinking about the effort it takes to research deep-sea coral, involving ROVs and commissioning ships to reach their remote locations, it’s no wonder we know little about them and so much more about their shallow water relatives.

Branwen and coral — Branwen and one of the Acanthogorgia samples

Dirk and Andy coral — Dirk and Andy after a job well done

Chief Survey Tech and ROV — Our Chief Survey Tech waits patiently to assist with the next ROV dive.

Tag: channel islands national marine sanctuary

Sarah Raskin: Teacher at Sea Day 4, March 16, 2015

Sarah Raskin: Teacher at Sea Days 2 & 3, March 14-15, 2015