Transition Brockville archive

Tag : Arctic ice (27)

How a warming Arctic fuels cold snaps

InsideClimate News / Bob Berwyn / 28 September 2017

When winter sets in, “polar vortex” becomes one of the most dreaded phrases in the Northern Hemisphere. It’s enough to send shivers even before the first blast of bitter cold arrives.

New research shows that some northern regions have been getting hit with these extreme cold spells more frequently over the past four decades, even as the planet as a whole has warmed. While it may seem counterintuitive, the scientists believe these bitter cold snaps are connected to the warming of the Arctic and the effects that that warming is having on the winds of the stratospheric polar vortex, high above the Earth’s surface.

[ FULL ARTICLE ]

Arctic Sea Ice minimum volumes 1979-2017

Andy Lee Robinson / 07 October 2017

Latest visualization of the startling decline of Arctic Sea Ice, showing the minimum volume reached every September since 1979, set on a map of New York with a 10km grid to give an idea of scale. It is clear that the trend of Arctic sea ice decline indicates that it’ll soon be ice-free for an increasingly large part of the year, with consequences for the climate.

Sea ice extent sinks to record lows at both poles

NASA Global Climate Change / Maria-José Viñas / 22 March 2017

Arctic sea ice appears to have reached on March 7 a record low wintertime maximum extent, according to scientists at NASA and the NASA-supported National Snow and Ice Data Center (NSIDC) in Boulder, Colorado. And on the opposite side of the planet, on March 3 sea ice around Antarctica hit its lowest extent ever recorded by satellites at the end of summer in the Southern Hemisphere, a surprising turn of events after decades of moderate sea ice expansion.

On Feb. 13, the combined Arctic and Antarctic sea ice numbers were at their lowest point since satellites began to continuously measure sea ice in 1979. Total polar sea ice covered 6.26 million square miles (16.21 million square kilometers), which is 790,000 square miles (2 million square kilometers) less than the average global minimum extent for 1981-2010 – the equivalent of having lost a chunk of sea ice larger than Mexico.

[ FULL ARTICLE ]

Scientists marvel at ‘increasingly non-natural’ Arctic warmth

Washington Post / Jason Samenow / 02 February 2017

The Arctic is so warm and has been this warm for so long that scientists are struggling to explain it and are in disbelief. The climate of the Arctic is known to oscillate wildly, but scientists say this warmth is so extreme that humans surely have their hands in it and may well be changing how it operates.

Temperatures are far warmer than ever observed in modern records, and sea ice extent keeps setting record lows.

2016 was the warmest year on record in the Arctic, and 2017 has picked up right where it left off. “Arctic extreme (relative) warmth continues,” Ryan Maue, a meteorologist with WeatherBell Analytics, tweeted on Wednesday, referring to January’s temperatures.

Veteran Arctic climate scientists are stunned.

[ FULL ARTICLE ]

Arctic Report Card 2016

NOAA / 13 December 2016

Arctic Report Card: Update for 2016 – Tracking recent environmental changes, with 12 essays prepared by an international team of 61 scientists from 11 different countries and an independent peer-review organized by the Arctic Monitoring and Assessment Programme of the Arctic Council. See http://www.arctic.noaa.gov/Report-Card

Just what the heck is going on with our climate?

Science Museum of Virginia / Jeremy Hoffman / 12 December 2016

A recent presentation by climate scientist Jeremy Hoffman.

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