Sea-ice in our model

To understand how the Arctic sea ice is changing and how it affects for example the underlying ocean currents, we work with a global sea ice ocean model (FESOM). For the last few years, a lot of effort has been put into improving the representation of the sea ice in the model. One focus has been on the large cracks – or leads, to use the correct name, that we know exist in reality. These are very difficult to capture in large scale models, but my colleague Qiang has now succeeded in modelling these leads and has put a video of the results on youtube. In this run, the horizontal resolution is 4.5 km in the Arctic Ocean. That’s quiet high.

Changes in Arctic sea ice

I knew that climate change was occurring when I started working at AWI, but I was not aware of how rapidly the temperature is changing in the Arctic or to what extent it has changed the area of the sea-ice.

The thing is, that while temperatures are increasing all over the planet, the increase happens faster in the Arctic than anywhere else; studies show that the mean Arctic temperature in 2010 was 4 degrees C warmer than the average for 1968 to 2010. And 2010 was not a particularly warm year. Continue reading