As the annual September sea ice minimum in the Arctic approaches, the usual questions arise about whether this year will set a new record for the extent or volume of ice left at the end of the summer. Although there was a new winter record low in 2017 it is looking unlikely that the summer will also set a record for extent, but there is still a month to go.
We understand that sea ice melt is erratic – we should not expect new records every year, but the overall trend is towards less and less ice. But, what about looking further ahead? And, can we understand sea ice variations during the historical period? Continue reading Linking global temperature and Arctic sea ice changes
Icebergs are much like clouds. They form all shapes and sizes, with a multitude of colours and textures. They are dynamic, constantly shifting, and drifting with the prevailing currents and winds. Some days there are lots and other days there are few.
The regions where icebergs form are some of the most awe-inspiring environments on the planet, but are undergoing rapid changes. Recently, I was fortunate enough to witness this up close on a kayaking trip, touring some fjords of southern Greenland. Continue reading Greenland reflections
The decline of Arctic sea ice over the past 40 years has been one of the more obvious signs that Earth’s climate is warming, especially in the summer when the ice extent reaches its annual minimum. Here you can watch how the amount of sea ice in the Arctic has varied since the start of the satellite era in late-1978. Continue reading Arctic sea ice animation
Scientists can’t do everything by themselves. We need to engage the millions of citizens who are passionate about knowledge to help solve scientific mysteries and improve our understanding of the world around us.
There are many ways that anyone with a computer can help – volunteer to rescue old weather data or loan your computer’s CPU to simulate the climate, for example.
Those with more technical knowledge might also contribute by communicating climate change in novel ways. Recently, Kevin Pluck (a software engineer) created a global sea ice spiral which gained widespread attention on social media – here he tells Climate Lab Book how he did it. Continue reading Animating global sea ice changes
The melt of the summer sea ice in the Arctic is dramatic. Each September, when the ice reaches its annual minimum, there used to be around 7.5 million sq km of ice. It is now regularly below 5 million sq km, and hit a record low of 3.6 million sq km in 2012. This downward trend is projected to continue as global temperatures increase, but somewhat erratically.
The year at which the Arctic first becomes ‘ice-free’ (traditionally defined as 1 million sq km) is much discussed by scientists and the media, but is often a controversial topic. Continue reading Predicting an ice-free Arctic summer
September is an important month for the Arctic. As the midnight sun begins to set and summer draws to a close, the melt of the Arctic sea ice cover grinds to a halt and the annual ‘sea ice minimum’ is set – usually some time around mid-September.
Guest post by Alek Petty (@AlekPetty), University of Maryland
Continue reading The sea ice orchestra
Imagine a ball bouncing down a bumpy hill. Gravity will ensure that the ball will head downwards. But, if the ball hits a bump at a certain angle it might move horizontally or even upwards for a time, before resuming its inevitable downward trajectory. This bouncing ball is an analogy for the behaviour of Arctic sea-ice.
Post based on Swart et al., Nature Climate Change, or see a less technical summary. Continue reading Arctic sea-ice decline erratic as expected
As we reach the end of a likely record breaking year for global temperatures, what might we expect for 2015? Continue reading Climate forecasts for 2015