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Blog Five

Main CampTrango tentUpper Victoria GlacierFull steam ahead! Tents up, camp kitchen assembled, field laboratory unpacked and assembled!  From here our primary goal is to trek to the 75 chosen GPS sites, take soil samples, look for invertebrates and survey a vegetation transect. From here the samples need to return to the main camp where a field laboratory has been set up, for initial tests before being package up at returned to the lab in New Zealand.

Today Glen and Kurt, have been on a mission to figure out a complex plan for the most efficient way to get 16 people to 75 random sampling locations in a valley with an area of around 300km2! Tricky task! In order to physically get to all the 75 sampling sites, 3 sub camps have been set up, our homes away from home, the main camp. 75 sites, 16 people and two weeks. 

Glen Stitchbury, a Geographic Information Systems specialist from the University of Waikato has used a number of satellite images to figure out where we need to go. By combining information such as elevation, slope, surface temperature, geomorphology and slope aspect, the entire valley has been divided into 1241 different polygons or tiles. Based on the previous years sampling a computer model has been created to predict the biological taxa that should be found within each tile. Luckily we DO NOT have to sample all 1241 tiles. Instead 75 random tiles have been chosen.

Kurt Joy, a phD candidate at Gateway Antarctica, University of Canterbury is an expert on glacial geomorphology. While Antarctica itself is alien enough to most, the Dry Valleys are a rare oddity in a continent predominantly covered in ice. What is most amazing is standing outside listening while Kurt gives me the “in a nutshell” geological history of this valley, is that there is nothing to hide the history. There are no trees to obscure the landscape, in fact hopefully we will get to see the ‘forests’ of Antarctica in a few days, in the form of tiny mosses and lichens. We see chocolate brown layers of Ferrar Dolerite injected into the creamy Beacon Sandstone, we see a present day glacier terminating up the valley as if carved off perfectly by a giant cake icing knife. Lake Vida used to be 200m deeper at the Last Glacial Maximum 15,000 years ago. It has left terraces perched high on the valley sides, and ancient glaciers have left lateral moraines even higher up the valley sides. This valley is the closest analogy to Mars, with ventifacts – wind sculpted silky black dolerite, frost heave polygons and desert pavements with the wind winnowing out the finer sediments.

Between Glen and Kurt, the two of them have spent the afternoon pouring over the maps, masterminding ways to optimize sampling routes, helicopter drop offs, and who will be located at each subcamp. Snippets of conversation escape from back of the tent amongst the piles of maps, “Ok that’s an easy one, 7km return”,  “Ohhh, that ones a destroyer, look at that profile, bet the view is worth all the pain though”…..

Nita Smith.

Photos:
Top:
The main camp
Centre: Trango tent, my home away from home
Bottom: The view from my tent, Upper Victoria Glacier
 

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1 Comments

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