January 23rd, 2018 by Kelly Brunt
Tom and I have returned to McMurdo Station!
Our traverse is complete, our gear has been stored for next season, and we are ready to head north to warmer climates. But in the meantime, we are awaiting our flight to Christchurch, New Zealand, at Antarctica’s largest research station.
McMurdo Station from above (Photo: Tom Neumann)
McMurdo is one of three permanent US research stations in Antarctica. The other two are Amundsen-Scott South Pole Station and Palmer Station, which is south of South America. McMurdo has beds for approximately 1,000 people, but while we have been here, the population has hovered between about 750 and 825.
While there is a research station operated by New Zealand just 2 km away, McMurdo is relatively isolated. As such, there are facilities here that provide all of the basic essentials required for living in the polar regions, such as power, heat, and water. McMurdo has its own diesel-based power plant, providing lights and heat to the station. The station gets its fresh water through the desalinization of the sea water in the neighboring bay via a method called reverse osmosis. And McMurdo has its own waste-water treatment facility. To operate a station this size, and in this environment, McMurdo also requires an airfield, a galley, and all of the staffing that goes along with running a small town. It is quite an operation.
McMurdo on a snowy day, with the chapel in the background. (Photo: Kelly Brunt)
McMurdo station also has specialized facilities that support the cutting-edge science that happens here. These facilities include a sophisticated laboratory that is capable of housing a cross section of Antarctic research disciplines such as glaciology, geology, meteorology, and biology.
The research that takes place here also includes really cool meteorite science! The search for meteorites is a bit simpler here than in other parts of the world. Since Antarctica is a thick sheet of ice, rocks found on the top of the ice sheet are often associated with debris fallen from space; these meteorites stand out against the white surface. Plus, the flow of the ice organizes the meteorites, making them more centralized for collection. Some of our colleagues from NASA Goddard Space Flight Center are part of this effort.
The U.S. Coast Guard Cutter Polar Star, in McMurdo Sound. (Photo: Tom Neumann)
The pier in town is currently the busiest spot on station. The US Coast Guard Cutter Polar Star has cleared a channel into McMurdo Sound, giving three other vessels access to town. The first is the Nathaniel B. Palmer, the US Antarctic Program’s premier research vessel, which has been in town for the past few days. Simultaneously, the entire station is preparing for the arrival of the two other ships: the tanker Maersk Peary brings in the annual fuel supply, and the Ocean Giant cargo ship brings in the food and supplies for the following year.
The Nathaniel B. Palmer in McMurdo Sound (Photo: Kelly Brunt)
Tom and I are scheduled to leave McMurdo on the next flight. But the weather has deteriorated and we are left patiently waiting for it to clear. We are extremely happy with our successful field season and have had a fantastic trip. Thanks for reading and following along.
-Kelly & tom
October 12th, 2016 by Kelly Brunt
By Alek Petty
View from a helicopter of our ice breaker, the CCGS Louis S. St. Laurent, taken after Ice Station 1.
The sea ice didn’t last long. We continued the hunt for sea ice suitable enough for another ice station – hoping for something thicker and more stable than last time around. Unfortunately our search was fruitless. The Woods Hole team tried for a quick installation of one of their ice tethered profilers (ITPs) –an ocean surface water profiler- on a thick ice floe that was only around 164 feet (50 meters) in diameter, but the ice was too ridged and porous to be suitable and the operation was quickly abandoned. They instead resorted to deploying two of their ITPs directly into the ocean from the side of the ship (this is less stable than wedging the surface buoy component of the profiler into an ice floe, hence why they’re called ice tethered profilers). Our hopes of getting out onto the ice again quickly vanished.
We were soon back to cruising through the marginal ice edge, which was dominated by newly forming young grey ice with the occasional floe of older, thicker, ice that had survived the summer melt season. We are now back to swaying our way through the high seas – not the kind of scene most people associate with an Arctic expedition. It was with a sense of deep regret that our time within the ice ended with nearly two weeks of the expedition still to go. For me, the expedition just isn’t the same without the sound of ice breaking reverberating around the ship (we’re on an ice breaker after all!)
Arctic sea ice extent as of Oct. 10, 2016.
We got a small dose of Internet after leaving the ice (I’m struggling to cope without it!) and I managed to get access to the National Snow and Ice Data Center website, which showed how the Arctic sea ice re-freeze has been really slow this year (see the sea ice extent image above), coinciding with very warm temperatures over much of the Arctic, including the Beaufort Sea. We’ve experienced temperatures only slightly below freezing on this expedition, so my thermals have stayed packed away. In the Beaufort Sea, the ice edge is clearly not heading south at any real speed, although as the temperatures are expected to drop further through the coming weeks and months, a refreeze across the entire Beaufort Sea should be inevitable.
Despite the lack of sea ice (and my associated despondence), the science was still operating at maximum speed. We had a talk from Adam Monier, a French microbiologist from Exeter University (United Kingdom) who talked about his efforts, along with collaborators from Concordia University (Montreal, Canada), to increase our understanding of the microbial communities of the Arctic Ocean. According to Adam, around 90 percent of the global ocean’s biomass is microbial (a mass equivalent to roughly 240 billion elephants!) and this was seriously underestimated as of only a few decades ago. He showed some fascinating results demonstrating how phytoplankton (a micro algae) can cope, and even adapt, to fast changing environmental conditions, like sunlight and access to nutrients – some of which can be linked to the changing Arctic sea ice state. There is still a severe shortage of Arctic data, and this cruise is trying to help fill in those gaps. As phytoplankton are the foundation of the Arctic Ocean’s food webs, understanding how they respond to rapid changes in environmental conditions will be key to understanding how the entire Arctic ecosystem responds to declining sea ice and changes in the Arctic Ocean. The expedition has been a great way for me to learn about the latest developments in Arctic science, and to appreciate how interconnected our various fields of research are.
October 3rd, 2016 by Kelly Brunt
By Alek Petty
Working on thin Arctic sea ice.
After five days of cruising through open water, it was clear we had to change course and venture further north to find ice. The satellite imagery was showing ice above 76-77 degrees North (we were around 74 degrees North), and the ice edge didn’t seem to be drifting south at any real speed. After another few days voyage northwards, we thus finally found ourselves entering the Arctic sea ice pack. This wasn’t exactly a scene from the Titanic; the transition from water to ice was a gradual one, as the ice cover evolved from millimeters or centimeters of newly forming sea ice (nilas and grease ice), to thicker, consolidated ice floes (maybe a meter or two thick; 3.3 to 6.6 feet), which caused the ship to lurch and shake as it broke its way through.
Early stages of sea ice growth: nilas (top left), pancake ice (top right), young grey-white ice (bottom left) and first-year ice (bottom right). The top photos are courtesy of Jean Mensa.
Once we were well within the ice pack, the Woods Hole team was keen to get out onto the ice and deploy some buoys. This would be my chance to get out on the ice too, as I was helping lead efforts to collect ice thickness measurements and ice cores, to better understand the characteristics (like salinity, density and age) of this year’s Beaufort Sea ice pack. The microbial and microplastic scientists were keen to join in and collect their own ice cores, too, enabling them to take a deeper look at what else might be hiding within the ice.
The Woods Hole team leader flew out with the helicopter pilot early the next morning to hunt for thick ice, and seemed to find an ice floe thick and stable enough for us to work on. I joined them on the first science flight out a few hours later to set out our survey lines and coring sites, before our cargo was carried over and the rest of the team members joined us. It was soon apparent that the ice wasn’t as thick as we had hoped.
I drilled a few quick holes and the readings all came in at around half a meter, just above what might be considered safe to work on. Our polar bear guard, Leo, wasn’t too happy with the conditions either and soon found a few good sized holes and cracks circling us. We were under strict orders not to stray from the group and to test the ice for stability as we moved ahead. I’ve previously used data from satellites, planes, and sophisticated computer simulations to estimate the thickness of Arctic sea ice. Yesterday, I estimated ice thickness by hitting it with a stick.
It wasn’t quite vertical limit, and the group rebuffed my idea of roping together for dramatic effect, but there were still a few hairy moments when the odd leg found its way through the ice. Despite the added element of danger, all operations completed successfully and we hitched a lift back to the ship later that afternoon with our ice cores in tow. The Woods Hole team was working until last light to get their buoys prepped and ready to drift off through the Arctic. It was a fun, adrenaline-filled day of science, but I’d prefer it if we could find some thicker ice to work on next time around.
Comments Off on Into the Ice
September 27th, 2016 by Kelly Brunt
By Alek Petty
My journey up to the ship went smoothly and I even had time to observe the Northern Lights (Aurora Borealis) in full bloom during our overnight layover in Yellowknife (in the Northwest Territories of Canada). The following day, a Canadian Coast Guard helicopter transferred us from Kugluktuk airport onto the ship, and after another day spent refueling and replenishing the boat, we were finally on our way to the Arctic Ocean.
The Northern Lights.
The Louis S. St. Laurent ice breaker.
I actually spent the first two days of our polar expedition sat out on deck, enjoying the sunshine and views over the Amundsen Gulf. In the distance I could just about make out the mouth of the Mackenzie River delta – a key outflow of fresh and mineral rich river runoff into the Arctic. This shelf sea region is rich in wildlife, including beluga whales and even narwhals. We looked out eagerly, but only spotted a couple of lowly seals in the distance. Maybe on our way back we’ll have more joy.
On Saturday morning, we emerged into the Arctic Ocean proper —the Beaufort Sea! — where conditions were a bit less serene. In fact, one of the consequences of the diminished Arctic sea ice cover over the past decades has been an increase in Arctic Ocean waviness, as the lack of sea ice enables winds to more effectively whip up the ocean. Arguably one of the most distressing impacts of climate change for us unhardened scientists.
Despite the continued lack of sea ice, the water sampling exercises have begun in earnest. At each research station (a virtual station if you will, we just stop at a predetermined location in the ocean) a large metal carousel with various water samplers attached —a rosette, as we call it— is released, profiling the water column as it sinks to the bottom of the ocean, before being hauled back up to the ship for analysis.
A rosette deployment.
There are around 50 stations in total that we plan on hitting during this expedition. The various scientists on board all have their own things their looking for in the water —plankton, bacteria, alkalinity, dissolved inorganic/organic carbon, micro-plastics (yep, they make it to the Arctic Ocean too), etc. You name it, we’re sampling it.
One of my tasks, along with Japanese scientist Seita Hoshino, is to profile the water column in-between theses stations using XCTD (eXpendable Conductivity Temperature and Density) probes. XCTDs provide a quick and cheap (well, about $800 per probe, so not that cheap) real-time analysis of the temperature and salinity of the water column while the ship is moving. I’ll try and show you an example profile in a later blog post.
We’re hoping to hit some ice soon, as for us ice observers there’s not a whole lot for us to get really excited about yet. It’s quite the contrast to the cold, icy conditions of my 2014 expedition thus far…
May 27th, 2016 by Kelly Brunt
By Walt Meier
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.
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.