Monday, March 25, 2013
A Warming Ocean and Albion Freezes
According to Jennifer Francis [research professor with the Rutgers Institute of Coastal and Marine Science] and a growing body of other researchers, the Arctic ice loss adds heat to the ocean and atmosphere which shifts the position of the jet stream – the high-altitude river of air that steers storm systems and governs most weather in northern hemisphere.
"This is what is affecting the jet stream and leading to the extreme weather we are seeing in mid-latitudes," she said. "It allows the cold air from the Arctic to plunge much further south. The pattern can be slow to change because the [southern] wave of the jet stream is getting bigger. It's now at a near record position, so whatever weather you have now is going to stick around," she said.
A recent paper by the US government's National Oceanic and Atmospheric Administration (NOAA) also found that enhanced warming of the Arctic influenced weather across the northern hemisphere.
"With more solar energy going into the Arctic Ocean because of lost ice, there is reason to expect more extreme weather events, such as heavy snowfall, heat waves, and flooding in North America and Europe," said the researchers.
The Met Office's chief scientist has previously said the melting Arctic ice is in part responsible for the UK's recent colder winters.
...the UK's government's outgoing chief scientific adviser Sir John Beddington warned that the world could expect more extremes of weather.
"The [current] variation we are seeing in temperature or rainfall is double the rate of the average. That suggests that we are going to have more droughts, we are going to have more floods, we are going to have more sea surges and we are going to have more storms." He said that said there was a "need for urgency" in tackling climate change.
"These are the sort of changes that are going to affect us in quite a short timescale," he warned. Last year saw record heat, rainfall, drought and floods in the northern hemisphere.