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Tuesday, January 23: Weddell Sea
Following our exploration of Paulet Island, the Hanseatic set course back to the Antarctic Sound through the Weddell Sea.
Several ice sheets feed into the Weddell Sea and there is a lot more floating ice there than there is on the other side of the peninsula. Icebergs of all sorts filled the water around the ship.
Floes of low lying sea ice are scattered throughout the sea. Sea ice is seawater that has frozen during the winter. It is just a few feet thick.
Visit the Sea Ice Home Page of the Ocean Modeling Branch of the Environmental Modeling Center
Most of the small ice floes that we passed had penguins on them. Although the penguins had not paid much attention to the Zodiacs as we cruised around the floes, they invariably ran or tobogganed away from the ship as it approached, leaping into the water on the far side of the floe.
The forecastle (pronounced focksel), the open deck directly above the bow, was opened to the passengers. Captain Notke selected one of the ice floes and steered the ship directly toward it. The ship slowed as we approached the ice.
A solitary Weddell Seal was lying quietly on the ice floe. Weddell Seals are "true seals". They have no external ear flaps and their hind limbs are more adapted for swimming and less useful for propulsion on land or ice. They are gray with dark spots.
Link to information about the Weddell Seal from the Sierra Club Handbook of Seals and Sirenians.
A flock of Adelie Penguins warily observed our approach and then started tobogganing toward the far side of the floe.
Background information about the Adelie Penguin.
The bow of the ship struck the ice floe and large cracks propagated rapidly across the ice. The Weddell Seal lifted its head and looked toward the ship, as if to decide if it should move or just go back to sleep. The penguins jumped off the floe and swam away.
Captain Notke ordered more power to the screws, and the ship plowed into the crack that had opened up in front of it. It pushed the smaller part of the floe to one side and crossed through the floe to the open water on the other side. We passed many more ice floes carrying penguins and a few more solitary Weddell Seals.
Paulet Island could be seen behind us as the ship plowed through the pack ice.
The largest were tabular icebergs that had been calved from the great ice sheets floating on the sea farther to the south. Tabular icebergs are flat on the top and can be miles across. The part out of the water is taller than the Hanseatic, over 60 feet tall, and the part under the water goes several times deeper than that. They have vertical sides that show relatively fresh fracture faces. They are made of the bluest, oldest ice.
This appears to be part of a tabular iceberg that has rolled over onto its side. The flat surface was originally the top of the iceberg.
There were also many smaller icebergs of irregular shape, which had calved from the faces of glaciers near the shoreline. As they melt from below, they occasionally roll over. The toppled icebergs have indented lines around them that mark where they had eroded along the previous waterlines. The ice of these bergs takes on an infinite variety of forms. They frequently have a mantle of white snow draped over the old, blue ice from the glacier.
We passed through an area with many large tabular icebergs that had been grounded on the sea bottom. The ship steered a course through the maze of blue icebergs. Captain Notke selected one of the bergs and brought the bow of the Hanseatic to within a hundred yards of the vertical ice face. Icicles hung from the overhanging parts of the face of the berg. It had the usual indentation at the water line.
You can buy 8"x10" or 11"x14" prints of my photo of Tabular Icebergs, Weddell Sea, Antarctica.
Customize your framed print of Tabular Icebergs, Weddell Sea, Antarctica at the LockettBooks Store at Lulu.com.
The large, low-lying floes are very popular with the penguins. The penguins fly out of the water and land on top of the ice, where they gather in large numbers.
Ice Floes are also very popular with Crabeater Seals. Crabeater Seals are the most common seals. Despite their name, crabs do not constitute the larger portion of their diet. They eat more fish and squid. Their fur is tan to brown and more uniform in color than the fur of the Weddell Seal.
Link to information about the Crabeater Seal from the Sierra Club Handbook of Seals and Sirenians.
This pair of Crabeater Seals was taking shelter behind a low ice ridge.
Leanna, one of the contingent of naturalists aboard the ship, had just come from eating lunch and was watching the seals through the window. She wasn't dressed for the outside weather, so every once in a while she would open the door a little and yell out to us what we were seeing.
Crabeater Seals were laying about on the ice in large groups.
We circumnavigated Dundee Island and entered the sound between it and Joinville Island, which is an extension of the Antarctic Peninsula. There was a lot of sea ice in the narrow sound between the islands.
A Cape Petrel patroled its cold and lonely territory.
Link to information about Petrels and other Birds of the Antarctic.
Joann Stock presented a lecture about Antarctic Volcanoes after lunch. Paulet Island is a volcano and we would be visiting another larger volcanic island in a couple of days, Deception Island. The central crater of Deception Island is a caldera. So much material erupted from the magma chamber under the volcano that the center has collapsed, very much like Crater Lake in Oregon. One part of the crater wall has collapsed, creating an entrance into the large harbor in the caldera. Eruptions at Deception Island have been recorded frequently over the last two hundred years. The last major eruptions were in 1969-70.
These volcanoes are located on tectonic plate boundaries and are explained as the result of magma upwelling along the faults. There is a region of volcanism on the Continent of Antarctica, which is not near a plate boundary. The source of those volcanoes is not well understood, and it has been suggested that there is a hot spot of upwelling in the mantle below the crust in that region.
Map of the Antarctic Peninsula.
You can buy a 2018 Calendar featuring my photographs of Antarctic Landscapes.
A dozen photos of Antarctic Landscapes. Locations include:
Cape Wild and Cape Lookout on Elephant Island,
the Weddell Sea,
Neko Harbor in Andvord Bay on the Antarctic Peninsula, and
Put a copy of the Antarctic Landscapes 2018 Calendar in your Lulu.com shopping cart for $14.95.
You can buy a 2018 Calendar featuring my photographs of seals taken in Antarctica.
A dozen photos of seals in Antarctica. Seals pictured include:
Cape Lookout on Elephant Island
Put a copy of the Antarctic Seals 2018 Calendar in your Lulu.com shopping cart for $14.95.
You can buy a 2018 Calendar featuring my photographs of birds taken in the Falkland Islands and the South Shetland Islands in Antarctica.
A dozen photos of birds taken in the Falkland Islands South Shetland Islands in Antarctica. Birds pictured include:
Southern Giant Petrel
Black Browed Albatross
Blue-Eyed Shag (King Cormorant)
Black Crowned Night Heron
Put a copy of the Birds of the South Atlantic and Antarctica 2018 Calendar in your Lulu.com shopping cart for $14.95.
You can buy a 2018 Calendar featuring my photographs of penguins taken in Antarctica and the Falkland Islands.
A dozen pictures of penguins taken in Antarctica and the Falkland Islands. Penguin species pictured include:
Locations where the photographs were taken in the Falkland Islands include:
Antarctic locations include:
Cape Lookout on Elephant Island. Put a copy of the Penguins 2018 Calendar in your Lulu.com shopping cart for $14.95.
Mawson's Will : The Greatest Polar Survival Story Ever Written (Paperback). by Lennard Bickel
Endurance : Shackleton's Incredible Voyage by Alfred Lansing
The Endurance : Shackleton's Legendary Antarctic Expedition by Caroline Alexander
South : A Memoir of the Endurance Voyage by Ernest Henry Shackleton, Sir Ernest Shackleton
South With Endurance : Shackleton's Antarctic Expedition 1914-1917
The South Pole by Roald E. Amundsen
The Coldest March: Scott`s Fatal Antarctic Expedition by Susan Solomon
The Last Place on Earth (Modern Library Exploration) by Roland Huntford
South: Ernest Shackleton and the Endurance Expedition (1919)
Shackleton's Boat Journey - The Story of the James Caird (1999)
Shackleton: Escape from Antarctica (1999)
The Last Place on Earth (1994)
Great Adventurers: Ernest Shackleton - To the End of the Earth (1999)
South: Ernest Shackleton and the Endurance Expedition (1919)
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