By Carin Ashjian for The Arctic Winter Cruise 2011
We are now, finally, in ice. The ship is shuddering along, not breaking ice but rather pushing floes of pancake ice aside. When occasionally we break into a lead of open water, the ship glides unfettered, seemingly not moving because there is no irregular bumping and jostling by the ice floes, no shaking and vibrating. This is not ice breaking, with its crashing and banging but rather we are moving through an ice field rather as a human walking through a tall field of corn, pushing aside the stalks easily but still not walking a straight, smooth path. It is a relief to finally be in the ice, where the seas are dampened. We are heading to a station near the Alaskan town of Wainwright where we will start sampling along a line that extends from the nearshore 58 miles to the NW.
Yesterday we saw our first ice, just a smattering of small pancakes that nonetheless evoked amazement and wonder in even those of us who have seen it many times before. We were in the ice long enough to collect a few chunks for Krista to melt down to collect the organic carbon. We’ve been working northwards through the Chukchi Sea to this first transect line but on the way we paused to deploy a mooring for some colleagues. The deployment went well, with the mooring placed only 12 yards from the intended position. Now we begin a marathon of stations, stopping every 6-7 miles along the track to sample.
We’ve been collecting plankton regularly in the net tows. Each tow brings a sense of anticipation and a great curiosity – what will we find here? We have found many krill, or euphausiids, that are important prey for bowhead whales in the Beaufort and Chukchi Seas particularly near Barrow. We also have found Calanus copepods, in particular a very large abundance of males. Male Calanus are rarely seen so it is quite strange to see so many! At the last station, we caught some larval crabs that were busily trying to eat the krill in the sample. Yesterday further to the south we caught a number of fish, much to Joel’s delight. Many of the copepods and krill are picked out, photographed, and saved for later analysis of their carbon and nitrogen content to see how much fat they have stored for the winter, their RNA/DNA content to see how active they are (are they entering diapause/hibernating?), and their genetics.
The real work of the cruise begins, now that we have beaten, bounced, pitched, and clawed our way through the storms of the Bering Sea up to the northern Chukchi. We are coming up to our first station on the line shortly (30 minutes). The air temperature is 17 F and the sea temperature is -1.75 C, just above the freezing point of seawater (-1.8C). Ice is forming around us.
By Carin Ashjian for The Arctic Winter Cruise 2011, WHOIExpeditions http://arctic-winter-cruise.blogspot.com/2011/11/into-ice.html Tuesday November 15th, 2011