The East Siberian Sea is turning blue.

Larger view for above image here​.

This is so incredibly sad and terrifying. A Blue Ocean event is a positive feedback loop where warming from humans burning of fossil fuel leads to a decrease in sea ice cover which in turn leads to a decrease in reflectivity (albedo) over the ocean, the result of which is further warming and further decreases in the sea ice cover.

NOAA provides an easy way to understand feedback loops:

A positive feedback is a process in which an initial change will bring about an additional change in the same direction. An example of a simple positive feedback in everyday life is the growth of an interest-earning savings account. As interest is accrued the principal will begin to grow (assuming money is not withdrawn). As the principal grows, even more interest will be accrued, quickening the rate of principal growth. There are also negative feedbacks, processes in which an initial change will bring about an additional change in the opposite direction. An example of a simple negative feedback is your body's cooling mechanism. When your body temperature rises, you begin to sweat. The evaporation of this sweat from your skin cools your body and your temperature returns to normal. It is positive, rather than negative feedbacks that contribute to abrupt climate changes. In positive feedbacks, a small initial perturbation can yield a large change. Negative feedbacks, on the other hand, stabilize the system by bringing it back to its original state.   

From Live Science, October of 2013: 

The Arctic methane time bomb is bigger than scientists once thought and primed to blow, according to a study published today (Nov. 24) in the journal Nature Geoscience.

About 17 teragrams of methane, a potent greenhouse gas, escapes each year from a broad, shallow underwater platform called the East Siberian Arctic Shelf, said Natalia Shakova, lead study author and a biogeochemist at the University of Alaska, Fairbanks. A teragram is equal to about 1.1 million tons; the world emits about 500 million tons of methane every year from manmade and natural sources. The new measurement more than doubles the team's earlier estimate of Siberian methane release, published in 2010 in the journal Science.

"We believe that release of methane from the Arctic, in particular, from the East Siberian Arctic Shelf, could impact the entire globe, not just the Arctic alone," Shakova told LiveScience. "The picture that we are trying to understand is what is the actual contribution of the [shelf] to the global methane budget and how it will change over time." - See more at: www.livescience.com/...

Weather simulation — Oh look it’s melting.