New Video: How Long Can the Last Ice Last?
January 28, 2021
Read the rest of this entry »The stretch of Arctic ice between Greenland and the Canadian Arctic Archipelago is known as ‘the Last Ice Area’, thought by scientists to have the best chance of surviving the climate crisis – but new research suggests it could be more vulnerable to disappearing than previously thought.
It’s the oldest and the thickest stretch of ice in the Arctic region, and up to this point it’s managed to survive even the warmest summers on record. There are even hopes that it will eventually act as the foundation of a spreading Arctic ice region, if we can get the planet to begin cooling down again.
Maybe not, according to a new analysis of satellite data looking specifically at ice arches along Nares Strait, which is 40 kilometres (25 miles) wide and 600 kilometres (373 miles) long.
Ice arches aren’t traditional arches at all, they’re key patches of ice that form seasonally and prevent other pieces of ice from entering a body of water. The Nares Strait and its arches could play a crucial role in whether or not the Last Ice Area survives through the peak of global warming.
“The ice arches that usually develop at the northern and southern ends of Nares Strait play an important role in modulating the export of Arctic Ocean multi-year sea ice,” write the researchers in their published paper.
“We show that the duration of arch formation has decreased over the past 20 years, while the ice area and volume fluxes along Nares Strait have both increased.”
Simply put, the Nares Strait ice arches that effectively hold the Last Ice Area in place are becoming less stable. The risk is that this old ice will not just melt in place, but also break up and drift southwards into warmer regions, speeding up the melting process.
The ice arches look like bridges on their sides, blocking the movement of ice from north to south. The problem is that the arches are breaking up earlier in the year than they have previously, allowing more ice to flow through the Nares Strait.
Every year, according to observations, the ice arches are breaking up a week earlier than before. The ice blockage is becoming thinner and less of a barrier, and that is leading to changes further north – it’s estimated that ice movement in the Last Ice Area is increasing twice as fast as it is in the rest of the Arctic.
Extinction: Not Just for Polar Bears
October 3, 2014
This week another massive beaching of walruses in the Alaskan Arctic. I did video on this a few years ago that is still relevant. The science denial media would like images of suffering animals to just go away, and for you to stop thinking about it all the time, dammit.
The Daily Caller tried to “debunk” the “myth” that a recent mass walrus beaching is connected to global warming, even though scientists say the walruses have crowded onshore because they cannot find a resting place on Arctic sea ice, which has declined significantly as the Earth warms.
An October 1 Daily Caller article titled “Myth Debunked: Arctic Walrus Beachings Are Nothing New” promoted zoologist Susan Crockford’s claims that a recent massive beaching of around 35,000 walruses on a single Alaskan shore has nothing to do with climate change. To support her claim, Crockford cherry-picked two instances of walrus beachings from the 1970s.
However, Biologist Anatoly Kochnev of Russia’s Pacific Institute of Fisheries and Oceanography told NBC News that extended beachings of this size only began occurring in the late 1990s, adding: “The reason is global warming.” Vox.com’s Brad Plumer further reported that this “appears to be the largest ever observed in northern Alaska, though NOAA is still trying to verify the exact numbers.” The current beaching is so vast that the Federal Aviation Authority is re-routing flights in order to avoid setting off a stampede.
In six of the past eight years, all of the floating sea ice in the Chukchi Sea (the region of the Arctic near the current haul-out) that walruses need to rest in between swims has completely melted away by mid-September, according to Chadwick Jay, head of the U.S. Geological Survey’s Pacific walrus program.
In the Daily Caller article, Crockford even noted that mass walrus beachings occurred in 2009, 2011 and 2014, but dismissed them simply because they “did not coincide with the lowest levels of Arctic summer sea ice” in 2007 and 2012.
However, every one of these years had much less Arctic sea ice than the historical average, contributing to the extended beachings.
Climate Denial Crock of the Week 