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Notes from the Field

Sea ice morphology and charismatic mega fauna

May 31st, 2016 by Maria-Jose Viñas

By Walt Meier

Walt Meier on a snowmobile.

Walt Meier on a snowmobile.

May 27, afternoon – After our morning orientation and introduction sessions, I headed out onto the ice for the first time. We were split into four teams; each team will rotate through a different activity every day with each activity being led by one or two experts that will serve as our guide. I was assigned to the Red Team. Our activity for the day was sea ice morphology, or studying the forms of sea ice, and it was led by Chris Polashenski at the U.S. Army Cold Regions Research and Engineering Lab and Andy Mahoney at the University of Alaska, Fairbanks. All the other activities were being conducted within a short walk of the beach, but in order to see different types of ice, we needed to roam farther. This meant using snowmobile. After getting comfortable on the machines, we headed out. Our first stop was on a first-year ice floe, or is ice that has grown since the previous summer. This type of ice is generally thinner than multi-year ice (ice that has survived at least one summer melt season) and its thickness is largely controlled by the air temperature during the winter (though how much snow falls is important too). Colder temperatures mean more ice growth and thicker ice at the end of winter. We measured the thickness by drilling a hole through the ice using an auger. Then we dropped down a measuring tape. The tape has a folding metal bar at the end that catches the ice at the bottom of the hole; the tape is pulled taut and the thickness is read off the tape.

An ice mass balance station in Barrow, AK.

An ice mass balance station in Barrow, AK.

According to Chris and Andy, first-year ice in the area normally should be about 1.5 meters (5 feet) thick. We measured only 0.75 m. That means it’s been a very warm winter around here. But that is nothing new; in recent years, warm winters have become the norm as indicated by thickness measurements. For the past several years, Andy has been installing a sea ice mass balance station on the ice, automatically taking thickness readings every 15 minutes through the winter. The data is available online here.

A polar bear in the distance.

A polar bear in the distance.

Next we head further north, past Point Barrow, the northernmost land in the U.S., toward the fast ice edge. On the way, we spotted two polar bears in the distance. Polar bears are not an uncommon sight. They usually hang out near the ice edge hunting seals, though they sometimes wander into town, which can be a problem. At this time of year they are attracted by the whale carcasses that the native populations pull onto the ice as part of their traditional whale hunts. The bears were distant and barely visible, but it was quite exciting to see a bear. Polar bears can be dangerous and during all of our activities on the ice, we will have a polar bear spotter –a trained local resident carrying a shotgun – with us at all times.

We left the polar bears to their business and rode further out to a multi-year ice floe that was more than 5 meters (16.4 feet) thick. We attempted to measure the thickness, but we didn’t break through the bottom of the ice at our auger’s (boring tool) maximum 5-meter length. To my untrained eye, the multiyear ice didn’t really look much different than first year. But with careful viewing, one could see an elevation change compared to the first-year ice. It wasn’t a lot, but a just little more elevation on the surface that floats above the ocean translates into much thicker ice because roughly 90 percent of the ice thickness lies beneath the surface of the waters. So a 5-meter thick floe of sea ice rises only about 50 cm (20 inches) above the waterline. The most distinguishing characteristic, at least at this time of year, are the brilliant blue melt ponds that form on the surface. As the snow melts, the melt water will accumulate in depressions in the ice, pooling into ponds. The crystal clear water on top of the pure multi-year ice produces a distinctive turquoise color reminiscent of the water around a tropical island. Melt ponds are very important because they absorb much more solar energy than the surrounding ice, which accelerates the melting process. But to be honest, when seeing a pond in person, the first thought one has is how pretty they are.

May27_meltpond

Walt, standing on a melt pond.

Walt, standing on a melt pond.

Just a few meters away, back on first-year ice, was another melt pond. But this had a much darker color due to the thinner and flatter ice. The water was also somewhat salty because first-year ice still retains some salt. The salt gets flushed out of the multiyear ice, so the blue ponds on the multiyear ice are fresh water suitable for drinking. We tried some and it was quite refreshing – ice cold!

May27_meltpond2

Next, we headed over to a large piece of ridged ice. Ice ridges form due to ice floes being piled into each other due to winds or waves. The fast ice does not move, but the drifting ice beyond does and when the winds blow toward the land, the drifting ice collides with the fast ice, forming mountains of ice. The one we investigated was around 5 meters (16.4 feet) high. This means the ice could extend 50 meters (164 feet) deep below the surface. However, the water is fairly shallow off the coast and in reality, the ridge was likely grounded to the sea floor. These grounded ridges actually stabilize the fast ice by acting like big support columns, holding the fast ice in place. This explains why the coastal ice remains in place long after the drifting ice has retreated.

The morphology activity was quite humbling to us satellite data scientists and modelers. We work at scales of 5 to 50 kilometers (3 to 31 mi) – i.e., we’re observing or modeling sea ice in 5-50 km aggregates. Here over just a few kilometers we saw a tremendously varied icescape. Even over just a few meters, we saw multiyear ice, first-year ice with melt ponds on each. How can interpret our satellite data to account for such variability and how can we simulate it the models?

With the ridged ice, we completed our tour of the various forms of ice found in the Barrow area at this time of year. We hopped on our snow machines for the ride home. In front of us the sun broke through the clouds, behind us the polar bears roamed, and all around us, a lovely landscape of ice.

Beachfront Resort

May 27th, 2016 by Maria-Jose Viñas

By Walt Meier

the house

I have arrived in Barrow, Alaska. It was an interesting flight up from Anchorage: the plane had seats only in the back half of the plane because the front half is used for cargo. That is because there are no roads into Barrow, so supplies need to be brought in by plane or, during the short summers, by barge. After a stopover in Prudhoe Bay, we arrived to gloomy skies, which are quite typical for this time of year. Temperatures are right around freezing. We are staying at the NARL, which originally was the Naval Arctic Research Laboratory. Various research groups and other activities –even a college– now share this facility.

The accommodations are spare, but comfortable. Most people are staying in Quonset huts (prefabricated huts made of galvanized steel), but I’m with four others in “The House”, which is more like, well, a house. We have a living room, kitchen, full bath, and four bedrooms. Because we have a kitchen, we are the base for meals where the whole group meets up to eat breakfast and lunch. Last night we all gathered for a light meal after arriving and, with 24 people, it got pretty crowded. But it was nice to catch up with old friends and meet new colleagues. Already the collaborations have begun as we informally discussed each other’s research.

The whole campus is on a narrow spit of land north of town sticking out into the Beaufort Sea. I can see the sea ice from the house. So you might say we’re staying at a beachfront resort! With the ice right out the window, it was tempting to take a walk out there last night. However, we were told to not go out on the ice until we get a safety orientation. The ice off the coast is landfast ice – ice that is attached to the coast, so it doesn’t drift with the winds. However, it can still shift with the tides, as evidenced by piles of ice ridged formed as ice got pushed together. So one doesn’t want to just run out on the ice without being familiar with the hazards. Oh, and there are also potentially polar bears roaming around – another very good reason not to go roaming off by oneself.

Our view of sea ice from The House.

Our view of sea ice from The House.

Now we’re heading off to our orientation session and introductory discussions where we’ll start learning about modeling, satellite data, and field observations. This afternoon we’ll take our first trip out onto the ice. When the week is over, each of us will have broadened our expertise beyond each of our core research areas and hopefully we may find new areas of research to collaborate on and advance our understanding of sea ice.

A Satellite Scientist Visits the Ice

May 26th, 2016 by Maria-Jose Viñas

By Walt Meier

Walt Meier

Whenever I tell people that I’m a polar scientist or that I study sea ice, inevitably one of the first questions I’m asked is, “so, have you been to the ice?” I’ve always had to answer no. I’m a remote sensing scientist who works with satellite data. Other than a few aircraft flights over the ice several years ago, I’ve spent my career in front of a computer analyzing satellite images. When I’ve needed field data, e.g., to validate satellite measurements, I could always obtain it from colleagues. So there has never been any need for me to go out on the ice. And to be honest, spending days or weeks in the field, as many researchers do, does not have particular appeal to me – I like the comforts of my heated office! Nonetheless, I’ve always wanted to get out at least once in my career and see the ice close up, feel it crunching under my feet, hear it creak and groan as it strains under the winds and currents.

An image of sea ice in northwest Greenland, capture by NASA's Operation IceBridge.

An image of sea ice in northwest Greenland, captured by NASA’s Operation IceBridge.

Now I am getting that chance, thanks to a National Science Foundation funded Summer Sea Ice Camp workshop. I and a couple dozen fellow scientists are heading to Barrow, Alaska – the northernmost point in the United States at 71 degrees N latitude – to partake in a unique project. The goal of this project isn’t specifically to collect data (though I hope that some of the data we collect will be useful), but rather to foster communication between remote sensing scientists like myself, sea ice modelers, and field researchers.

While there is a lot of collaboration in the sea ice community in terms of sharing data and results, scientists tend be silo-ed within their own area of expertise when it comes their actual work. Modelers focus on model development, validation, and results. Remote sensing folks like myself analyze satellite data. And field researchers collect and analyze in situ observations. Partly this is simply due to time – just focusing on one area keeps one plenty busy. But it is also partly due to a lack of communication. For example, I know a bit about modeling, but I don’t really understand the details of how a sea ice model is put together, how it can and should be used. Similarly, while modelers often use remote sensing data to compare with their model results, they don’t often understand the capabilities and limitations of satellite data. This can lead to under use or misuse of the data. And neither modelers nor remote sensing scientists may have much understanding of how to best take advantage of in situ data.

The goal of this workshop is to bring the three groups together for a week to talk and work with each other to better understand each of the three specialty areas and how perhaps the three groups can better work with each other to advance our understanding of sea ice. So now I’m on my way to Barrow, Alaska, looking forward to helping others understand satellite data, as well as running sea ice models and feeling that crunch of ice and snow under my feet as I collect data from on top of the Arctic Ocean. More in my next blog post from Barrow!