Around the Continent—Calling on the Vessels
Posted November 9, 2012
The research vessel Nathaniel B. Palmer sat idle at Punta Arenas, Chile, during the month of October. However, the ship's crew did welcome some special visitors aboard last month.
Scientists and other personnel working on the NASA IceBridge campaign got a tour of the U.S. Antarctic Program's largest research vessel on Oct. 24 from Palmer personnel Jamee Johnson and Chris Linden.
IceBridge is a six-year campaign by NASA to survey the icescapes of both Antarctica and Greenland. It began in 2009 after the ICESat satellite that had monitored the polar regions failed before it could be replaced with ICESat II. The plane has made more than a dozen missions across western regions of Antarctica this year, flying an average of 11 hours for each flight.
Posted November 9, 2012
Winds, weather and ice — lots of ice — made the month of October a challenging one for the latest research cruise by the Laurence M. Gould .
It was an ambitious schedule to start for theU.S. Antarctic Program’s workhorse research vessel. It was to head first to King George Island to put in a field camp operated by NOAA , which supports jointly with the National Science Foundation a long-term study of penguin species. The research is part of the Antarctic Marine Living Resources (AMLR) program, established by the AMLR Convention Act of 1984, with the goal of managing the Southern Ocean resources through an ecosystem approach. [See previous article — Going on a diet: Penguins' primary prey reveals drastic changes in climate.]
The next stop was Palmer Station on Anvers Island to transport additional support staff and scientists to the USAP’s smallest research base.
Photo Credit: Stacie Murray/Antarctic Photo Library
Thick pack ice greets the GOULD as it approaches Palmer Station.
The ship also carried a half-dozen scientists participating in the LARISSA (LARsen Ice Shelf System, Antarctica) project , a multiyear, multidisciplinary program to study the changes wrought to the region by the break up of the Larsen B Ice Shelf in 2002. The study also involves collecting data about the past conditions that existed in the region thousands of years ago to put the collapse in context. [See LARISSA project landing page.]
The crossing of the famously rough Drake Passage between the tip of South America and the Antarctic Peninsula was uneventful. But that was just the proverbial lull before the storm.
Winds in excess of 40 knots met the vessel as it reached King George Island, temporarily delaying the deployment of small Zodiac boats to transfer people and cargo to the Copacabana field camp, until they subsided later in the day.
Continued strong winds slowed the ship, forcing the scientists to scuttle plans to install a new GPS station in the region for the LARISSA project. Instead, they satisfied themselves with a survey of the seafloor for an operation to collect sediment cores later in the cruise.
The Gould finally headed to Palmer Station on Oct. 16, only to be greeted by an unusually thick band of pack ice that delayed the ship’s ability to enter Hero Inlet by about eight hours. Leaving the area proved even harder the next day, as the ship only made it about three miles from the station over 11 hours before turning back to the safety of Arthur Harbor.
“Sea ice conditions in and around the Danco Coast, Gerlache [Strait] and Bismark Strait are reminiscent of the 1980s, with fast ice clinging to the fjords and embayments all the way north to Hughes Bay. This condition is not the pattern we have seen in the last decade or so,” wrote Eugene Domack , chief scientist for the cruise, as well as for the LARISSA program.
Pack ice has proven to be especially troublesome for the LARISSA project. In 2010, a large science team aboard the research vessel Nathaniel B. Palmer were locked out from reaching the area where the Larsen B Ice Shelf once floated by thick pack ice. A second attempt earlier this year on the eastern side of the peninsula was also stymied by sea ice, though the researchers were able to work farther north where the Larsen A Ice Shelf once sat. [See previous article — A good proxy: LARISSA project studies ecosystem changes since Larsen A Ice Shelf collapse.]
It wouldn’t be until Oct. 21 before the Gould could find enough open leads to leave Palmer Station. Scientists were able to eventually collect several valuable sediment cores from the seafloor in the region, but strong winds and ice conditions generally prevented them from reaching islands to install or repair GPS stations.
Even the Drake got into the act in the last couple of days as the Gould returned to Punta Arenas, Chile, when winds kicked up to more than 50 knots per hour and in excess of 60 knots in squalls. Wave heights were in the 10-meter range before the ship reached the safety of the port at the end of the month.