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Showing posts from November, 2016

Sea ice is shrinking

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Arctic sea ice extent fell 0.16 million km² from November 16 to November 19, 2016, as illustrated by above ads.nipr.ac.jp/vishop image. The image below, based on NSIDC data, shows the Arctic sea ice shrinking 49,000 km² in four days. This is happening at a time when there is little or no sunlight reaching the Arctic, as illustrated by the image below. The image below was created by Torstein Viddal and earlier posted at the  Arctic Sea Ice Collapse  blog. This recent fall in extent is partly due to strong winds, as illustrated by the image on the right. Mostly, though, the lack of sea ice over the Arctic Ocean is caused by very warm water that is now arriving in the Arctic Ocean. During the northern summer, water off the coast of North America warms up and gets pushed by the Coriolis force toward the Arctic Ocean. It takes several months for the water to travel along the Gulf Stream through the North Atlantic. It has taken until now for the Arctic Ocean to bear the brunt of this heat

Monthly CO₂ not under 400 ppm in 2016

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For the third year in a row, global carbon dioxide emissions from fossil fuels and industry (including cement production) have barely grown, as the Global Carbon Project image below shows: Nonetheless, CO₂ levels have continued to rise and, as illustrated by the trend on the image below, they may even be accelerating. According to NOAA , annual mean global carbon dioxide grew from 2004-2014 by an average 2.02 ppm per year. For 2015 the growth rate was 2.98 ppm. As an indication for what the 2016 growth rate will be, global CO₂ levels grew by 3.57 ppm between September 2015 and September 2016, and by 3.71 ppm between October 2015 and October 2016. How could growth in CO₂ levels in the atmosphere possibly be accelerating, given that emissions from fossil fuel burning and cement production have barely risen over the past few years? Deforestation and other land-use changes, in particular wildfires During the decade from 2006 to 2015, emissions from deforestation and other land-use change

Less sea ice, warmer Arctic Ocean

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On November 2, 2016, Arctic sea ice extent was at a record low for the time of the year, i.e. only 7.151 million km². The currently very low sea ice extent is further dragging down the average annual sea ice extent, which is also at a record low, as illustrated by the image below, from the blog by Torstein Viðdalr . Not only is Arctic sea ice extent very low, the sea ice is getting thinner and thinner, as illustrated by the image below, by Wipneus , showing the dramatic recent decline of Arctic sea ice thickness. As the Naval Research Lab 30-day animation below shows, Arctic sea ice isn't getting much thicker, despite the change of seasons. Naval Research Lab 30-day animation (new model) up to Nov 1, 2016, with forecast up to Nov 9, 2016 In the two videos below, Paul Beckwith further explains the situation. Paul Beckwith : "Arctic sea ice regrowth is eff'd this year, in fact is truly horrible. As the ice extent, defined as regions with at least 15% ice, tries to expand v