Yesterday we passed through the Aleutian Islands. The Aleutian Islands are a chain of volcanic islands dividing the Bering Sea from the Pacific Ocean. We were lucky: the visibility was good, and it was still light outside, so that we could see one of the islands relatively clearly, and two others could be seen (using binoculars) on the horizon. South of the islands is the Aleutian trench, where the Pacific Ocean is nearly 8000 meters deep.
Tonight is the time for time-travel! At midnight, the day will start over. Today is Tuesday May 24th; tomorrow is also Tuesday, May 24th. Tomorrow becomes today…
For more than three weeks, we have been underway aboard the Sonne as we transect the Pacific. While we carry out our research around the clock, others are also working night and day. The Sonne does not operate itself – the engines are continuously working. Moreover, the 70 people aboard need power, water, and heat, and we need special technical support for our equipment.
The brand-new CTD from ICBM – Germany’s largest CTD – is being used for the first time during this research cruise with the Sonne. In addition to valuable data, the CTD brings 24 large bottles of seawater from different depths on deck. Not ‘just’ water, but up to 480 liters with every cast. Continue reading
There are regular safety drills on board, so that everyone knows what to do in case of an emergency. The safety drill was announced ahead of time; once the alarm bells rang, we rapidly collected our life vests and met at the assembly point on deck.
We have been on board Sonne already for 15 days; it feels like we have been here since forever. We know where everything is and we are so used to our working space. But it was not always like this…
The microorganisms in the ocean enjoy the sun and warmth of the equator, just as we scientists do when we are not working. Here in the equatorial upwelling zone, microorganisms grow well because of the extra nutrients that are brought to the ocean’s surface by upwelling (upwards movement) of water from the deep ocean. As a consequence, in certain depths of the water column, oxygen is consumed faster than it is supplied via circulation
This morning at 6 a.m. we ended our 24-hour sampling at this station, and continued our journey north. Neptune, of course, noticed that we had passed the equator without permission; he visited us in person.
We have finally reached the equator – the boundary between the northern and southern hemispheres at 0 N and 0 South. But we aren’t just anywhere on the equator: we are exactly at the point at which one step in the right direction can turn today into yesterday, and visa versa. Our station is exactly on the international date line between 180 W and 180 E.