Dec 2 – Profiling the narrows again

December 10, 2009

John thought that it would be a good idea to profile the narrows again so that he could see the variation in properties with respect to time. We profiled the narrows again yesterday. This time, the mission seemed very easy and went very smoothly. Below is a plot of the narrows (from Bill) using the data from the previous run.

Plot of the narrows from sonar data. The narrows refers to the narrow channel that connects the east lobe to the west lobe. In this view, we are looking from the east side. The points are color coded, so the green points are at a lesser depth than the blue ones. About 100 years back (1903), Scott's team travelled through this region and took various measurements. This channel was much narrower back then. (Sorry no numbers, Peter mentioned their values, but I don't remember them anymore).

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Nov 28 – Thanksgiving

December 4, 2009

We took Saturday off to celebrate Thanksgiving. I woke up around noon to see almost everyone already up and to be greeted cheerfully by Emma. Peter was cooking turkey (apart from other stuff) , and Kristof was working on a veggie casserole. After breakfast, I decided to hike down valley to the east end of the lake. Emma decided to accompany me and we had a great time. It was very beautiful and quiet there – it was as if we had traveled back in time. It is rare to get such a sense of solitude and freedom. We came back and enjoyed  a very nice Thanksgiving meal and desserts cooked by Bill and Emma.

Peter working on turkey.

Myself on the way to the east end of the lake.

Emma. Behind her is the east end of Lake Bonney.

During summer, glacier melt-water flows into streams that feed into Lake Bonney. Emma walking by Priscu stream.

Thanksgiving dinner. Starting from left front and going clockwise - Emma, Vickie, Chris, Rachel, Peter, Kristof, Bill, Leah.


Nov 26-27 – Fully autonomous missions

December 4, 2009

We  finished our major science missions – profiling and glacier exploration. Our next goal is to obtain reasonably good bathymetry of the lake bottom. We obtained partial coverage last year, and we will attempt to fill in the gaps this year. We ran fully autonomous missions with zero manual intervention during the missions.  These missions are easy for all of us and it was nice to relax and just watch the data flow. More on this later.

Bathymetry coverage of West Lake Bonney obtained during 2008 missions.