Our guest blogger today is Chris Linder, a Research Associate at the Woods Hole Oceanographic Institution in Massachusetts. He is the project manager and field photographer for the National Science Foundation-sponsored Live from the Poles project. Today – in addition to sending us weekly updates -Chris and fellow researcher Dr. Ian Joughin made a live call to our summer campers in the Burke Baker Planetarium; we hope to post the audio from the call here soon. If you’ve got questions of your own, visit us tonight – they’ll be calling us back. For now, here’s more from Chris, from the ice sheet:
|The camp at North Lake|
We have been camping on the ice sheet for over a week now, and it’s amazing to think how familiar this environment now seems, especially compared to how foreign it felt when I stepped off the helicopter.
Some of the peculiarities of living on a 3,000-foot thick slab of ice:
– Water: you don’t have to carry a water bottle on a hike, just a cup. The water is the best tasting I’ve ever had.
– Cooking: no refrigeration required! We made a no-bake cheesecake the other night and it was quite a treat. Just left it outside the cook tent to chill…
– Slippery tents: instead of using tent stakes to secure the tents, we use ice screws, which are 6-inch metal screws. The problem is, they heat up in the sun and melt out after a day, so we spend a lot of time repositioning the ice screws.
– No night: this is a tough one—the 24 hours of daylight make it hard to sleep and it’s easy to forget what time it is.
The past week has been a busy one—we typically wake up at 8 a.m. and sometimes don’t finish work until 1-2 a.m. The science team has been working nonstop to refurbish their long-term instruments and survey the terrain by foot and air. They successfully installed two new instrument towers on the shores of the recently drained South Lake, which will measure the weather, icequakes (using a seismometer), and the movement of the ice sheet (using a sensitive GPS). For more information about the tools our science team uses to track moving ice, visit the Polar Discovery tools page
|View of a glacial lake from a helicopter|
We also completed an hour-long helicopter survey of 20 nearby lakes. An aerial perspective gives you so much information that you can’t get from either the ground or from a satellite. You can see immediately the water level in a lake, count the number of inflow channels, and see where the lake is draining (if at all). The weather cleared during the survey and we had magnificent views of the glacial lakes – full ones, empty ones, and draining ones.
On July 16, we disassembled our carefully constructed home at South Lake and packed everything up for a move to North Lake. Although much of the work will be similar to what we did at South Lake (removing existing instruments, assembling new ones, and field mapping by foot and helicopter), the research team is expecting to see different processes at work here.
Last year, South Lake drained through a huge downstream channel, while North Lake gushed through a gaping hole called a moulin right in the center of the lake. This year, new observations at South Lake confirmed that the water primarily drained through a huge crack that ran right through the lake.
In the coming days, the science team is hoping to piece together this year’s story about North Lake, how it is similar and different from South Lake, how this knowledge can help to understand the thousands of glacial lakes that form on the ice sheet each summer, and what conclusions can be passed along to researchers modeling the global climate. Don’t forget to visit Polar Discovery to see daily photo essays!
|Newly installed instrument towers at South Lake|