What Lies Beneath Arctic Ice?
On Thursday we lowered a camera into an ice borehole to get a look at the underside of the ice. In the following video, you can clearly see the algae living in the bottom of the ice due to their pigments, which they use to harvest light.
These organisms are not frozen into the ice; they’re living creatures that grow and thrive in tiny pockets of brine inside the ice. You might notice in the video that the underside of the ice is not flat, this is probably a reflection of variability in physical conditions in and above the ice, such as snow cover thickness.
While watching this video, Andy Juhl and I discussed how cool it is that there are vibrant communities growing in extreme environments. “One of the lessons that research in polar regions has taught us is that we need to broaden our definition of where life exists and thrives. In the Arctic, we have life growing inside ice, at below freezing temperatures. This means that we know to look in more unusual places for science of life and that’s one of the interesting things we learn by doing this kind of work,” Andy said. “Ice is not necessarily an inhospitable habitat, and on other planets where we see ice, that’s a place where we should probably look for signs of life.”
The second film shows a bit of life on the seafloor. This video was shot near shore where the water depth is about 8 meters, so it’s fairly shallow; water temperature here is -2C. The bottom consists of soft mud and it looks like there are deposits of algae that probably came from the ice on the surface of the bottom (those are the darker areas). There’s a variety of bottom dwelling organisms that live in the mud, such as the isopod that wanders across the mud in this clip. We don’t yet know how large the isopods are or what they eat; scientists on our team are trying to figure out a way to measure an isopod in situ or capture one to examine in the lab.
As our work in Barrow progresses, we’ll continue to post more videos so that you can get a sense of the life that makes up this fascinating ecosystem.