Showing posts with label antarctic. Show all posts
Showing posts with label antarctic. Show all posts

Wednesday, 14 September 2011

Review: The Longest Winter: Scott's other Heroes (Meredith Hooper)

I've just finished reading: The Longest Winter: Scott's Other Heroes by Meredith Cooper.

The Longest Winter concerns the activities of the member's of Scott's expedition that were tagged on to make it look like some serious science and exploration was included in his plans. Initially the group of six were to be deposited on the Ross Ice Shelf to explore to the East, but this was foiled by the lack of a suitable landing site at the Eastern edge of the ice shelf, and the subsequent occupation of the Bay of Whales by Amundsen's expedition.

Instead, the party was sent West, initially spending a comfortable winter at Cape Adare, far to the North of Ross Island, at the same site occupied by Borchgrevink in 1899, and where a small ruined hut remains to this day. This was a disappointment for the party as they had hoped to be installed mid-way along the Victoria land coast from which they could explore routes to the plateau and collect useful geological information. The Cape Adare site was unsuited to exploration as the sea ice was uncertain (being affected by frequent storms, and having few points on which to be pinned), and rocky mountains prevented sledging access to the interior.

At the end of this first winter, the party was collected by the Discovery and moved to a site at Terra Nova bay, close to the Drygalski ice tongue, to spend a few weeks exploring before being picked up and returned to the main expedition at the end of the summer. Instead, the ship was unable to access their landing site on its return, and the six men were left with no choice but to make do. This is where the real story starts, but also where the least information is available from the men, and, in fact, where very little actually happens.

The party found that winter brings terrible katabatic winds, similar to those that would be experienced by Mawson during his first winter. Terra Nova bay, in fact, is now known to be one of the windiest, and least hospitable places to be outside of the short sunny months of summer. Lacking in supplies and shelter, a snow cave was excavated, a seal-blubber stove constructed, and as much meat hunted as possible. Survival was slight, and the winter passed with little activity and much suffering. At its end, the men resolved to make their own way out of their situation, and begun to sledge back over the uncertain terrain of the Drygalski ice tongue, and along the sea ice of the Victoria Land coast to safety at Ross Island. Somehow, mainly through the good leadership of Campbell and the wise planning of Priestley, supplies were made to last, and sufficient strength was obtained for the men to struggle back to the main party, only to meet the sad news that Scott was dead.

The book has its good parts. For the reader experienced in the literature much will not be new, as the story Campbell's party is interleaved with that of the other portions of the expedition, and it was not always easy to skip over the parts I'd read many times before elsewhere. The parts concentrating on the men stuck out near Inexpressible island are good, well researched, and tied together to make a strong story. I would have been happier had the book been shorter, and concentrated only on this strong material, but I can see the use of the wider context to those not already steeped in the story. Hooper also uses the same names as the expedition used to place the action. This is a shame as it misses much of the later lore lain over the land, and makes it harder for me to know where anyone ever is, but then I am very familiar with the modern geography.

Finally, some parts of the book will make you feel very cold, so I'd suggest reading it while in a warm bath...

Tuesday, 6 September 2011

Where to go in Antarctica?

Well, where to go if you can only go to Scott Base or McMurdo. Sounds obvious, right?

Maybe not... if you're a sun lover (and who isn't), you'll soak up slightly more rays at McMurdo than at Scott Base (assuming that you even go outside).

The following plot was generated by taking the sunshine energy arriving at Arrival Heights (just above McMurdo) and subtracting the sunshine energy arriving at Scott Base. Positive numbers (blue) correspond to McMurdo being sunnier, negative (green) mean SB was best. The red running line shows the 5 times exaggerated 7 day average of all years from 2000 to the present.


So, if you want to sunbathe, McMurdo's the place to pick, especially while the light is going or coming.

Friday, 11 March 2011

Sea ice breakup in McMurdo Sound, 2011

Our group installed an ice tethered profiler in the sea ice by Scott Base, close to where we spent much of the winter of 2009 working on the sea ice. If we'd been down there now, we'd have quite wet feet as the sea ice which had been in place since about 1998 has finally succumbed to a well-timed storm and has broken out. This is bad news for our ITP, as it has drifted to a position where the ocean depth is too shallow for the length of cable, so the poor unit is spending a lot of time acting as an anchor in the mud. Hopefully it will clear the coast and start working again...

Here are a series of satellite images taken around the time of the breakout, with the path of the ITP superimposed on them.


2011-02-20 (a big storm makes lots of waves, you can see the road from McMurdo to Pegasus as a white line near the profiler, with a tongue of water crossing it...)


2011-02-22 (the ice edge moves towards the profiler)


2011-02-23 (moved, stuck by the ice shelf)


2011-02-24



2011-02-25 (escapes from the ice shelf edge)


2011-03-03 (a few days later)

Monday, 10 January 2011

Antarctic exploration eBooks

Being a geek of all things Antarctic, and most things Arctic, I've dug out a number of out of copyright accounts of the early exploration, some of which are really quite good:

Worth actually reading:

Roald AMUNDSEN
Apsley CHERRY-GARRARD
Worth reading if you obsess:


Sir Douglass MAWSON
James COOK
Charles TURLEY

Thursday, 22 April 2010

Antarctic-Arctic see-saw

In recent years we've seen a large loss of sea ice in Arctic and a small increase in the Antarctic. This is a well established fact, but sometimes we are asked 'why don't they both decrease, if global warming is global?'. This is a reasonable question, and one explanation for this was found in an interesting analysis by Chylek et. al. in GRL, 'Twentieth century bipolar seesaw of the Arctic and Antarctic surface air temperatures': (http://www.agu.org/journals/gl/gl1008/2010GL042793/).

They show that over the 20th century when the Antarctic was a little warmer, the Arctic was a little cooler, and vice-versa, and explain this by suggesting that the Atlantic ocean couples the Antarctic and Arctic regions, with ocean currents sometimes sending warm water northwards away from the Antarctic (so cooling the Antarctic) through the equator and on to the Arctic (so warming the Arctic), and sometimes this not happening quite as much, making the Arctic a little cooler, and the Antarctic a little warmer.

This imposes a strong signal of warming and cooling on top of the signal from CO2 driven global warming, so we shouldn't be surprised if major changes driven by temperatures, such as the extent of summer sea ice cover, appear at one of the poles without showing up immediately at the other.