8 December, 2003
The Pump Station
While there are eleven members of the Erebus team, there are actually several individual projects being conducted concurrently this season. Shauna Mikelich, a graduate student at New Mexico Tech, is sampling volcanic gas for aerosols, tiny invisible parcticles. I accompanied her today on her sampling trip up to the crater rim.
Before leaving for the rim, Dr. Philip Kyle, the Principal Investigator on the Erebus project and Shauna’s advisor, showed her how to assemble the filter packs used in this project (Figures 1 and 2). The filter packs consist of three filters separated by plastic sleeves sealed with o-rings. The top filter is untreated and it catches any solid parcticles that are larger than 2 microns. The next two filters in the series are treated with lithium hydroxide (a base) which traps any acidic gasses. The third filter is used to catch any material that makes it past the first two (Figure 3).
After the filters were assembled, we rode the Skidoos part way up to the crater rim. The route we travel to get to the pump site is twisty, steep, and rocky. As we have eleven people and only six Skidoos, we often have to ride double. As it happened, this was my turn to ride on the back of one of the big Scandic Skidoos. As Harry, the driver, floored the snowmobile up a path aptly named the “Rock Garden,” I flew off right off the back and landed square on my stomach. Ouch! This was my first spill off of a snowmobile and, as I trudged up the slope to catch up to Harry who didn’t realize I was gone, I hoped it would be my last. I had no such luck as, on the final turn, we flipped the Skidoo over. Pushing against the overturned machine I started thinking that walking just might be preferable.
Safely on my own two feet again, I started the seemingly endless climb to the pump site. Relieved to find that the climb was easier than yesterday, I searched for crystals on the way up. After a quick breather at the top and another admiring glance into the cloudless crater, we got to work. We gassed up the generator, attached the batteries, and then hooked up the pumps that would draw the plume air through the filters (Figure 4). We attached the filter packs to a rack overhanging the crater rim (Figure 5), recorded environmental information (Figures 6 and 7) and flipped the “on” switch. For the next 90 minutes we were free to wander around and see the sights.
One attraction from the rim was watching part of our team attempt to reach the inner crater (Figure 8). The last attempt was in 1978 and it was foiled by an eruption of lava bombs. Dr. Harry Keys (Figure 9), from New Zealand, and Peter Kelly (Figure 10) rappelled down the main crater wall and, using crampons, traversed to the inner crater. At about 9 PM, they became the first people to stand at the edge of Erebus’s lava lake! Quite an exciting accomplishment!
As our colleagues were descending to the lava lake, we finished pumping. With numb fingers, we disassembled the pumps and stored the filter packs in plastic bags. Before descending to the Skidoos, I unfurled the St. John’s School pennant at the top of Mt. Erebus. Narrowly missing a gust of wind that could have incinerated the flag in the lava lake, we managed to take one photo before the camera batteries died from the cold. Taking our cue from the camera, we headed back to the warmth of the Lower Erebus Hut and dinner.
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