New worries about the future rate of sea level rise, for reasons originating at both poles:
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New findings show that surface meltwater speeds the flow of Antarctic glaciers, affecting sea level rise (University of Sheffield). “Surface meltwater draining through the ice and beneath Antarctic glaciers is causing sudden and rapid accelerations in their flow towards the sea…..The effects of such a major shift in Antarctic glacier melt on ice flow has not yet been incorporated into the models used to predict the future mass balance of the Antarctic Ice Sheet and its contribution to sea level rise…..As atmospheric temperatures continue to rise, we expect to see more surface meltwater than ever, so such behaviour may become more common in Antarctica.”
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A new explanation for the increase in meltwater runoff from Greenland’s ice sheet (Inside Climate News). As summers grow hotter, massive amounts of water are just running off the surface instead of percolating downward and refreezing. “These interior regions of Greenland didn’t use to run off, so you didn’t have to worry about them in terms of sea level rise…..Every time we look, we see changes that suggest more rapid melting of the Greenland ice sheet than we thought 20 years ago…..the tipping point, beyond which the Greenland Ice Sheet would continue disintegrating, could be reached twice as fast as estimated.”
–From a highly-regarded senior scientist:
“There is no question now that we’re seeing melt from both Greenland and West Antarctica that is far ahead of schedule relative to what most models previously predicted,” said Pennsylvania State climate scientist Michael Mann. “Only a decade and a half ago, the IPCC was predicting a foot or so of sea level rise by the end of the century. Now, we can no longer rule out 6-8 feet by the end of the century.”
A report covering the harmful algae blooms being found in inland waters all over the US (The Guardian). The incidence just keeps going up—this year’s outbreaks are up 22% compared with a year ago. High temperatures and excess rainfall are key contributors while agricultural chemicals lay the principal groundwork.
https://www.theguardian.com/environment/2019/sep/18/toxic-algae-climate-change-slimy-lakes-dead-dogs
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What high heat does to the human body (The Conversation). Written by an Australian professor, this story has lots of unusual information, all worth keeping in mind.
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An account of things now happening in China (New Republic). Efforts to tackle the climate crisis are in place, but face many challenges. In short, “Can China’s environment, indeed the global environment, sustain the consumption habits of one billion middle class Chinese?” The article also draws interesting comparisons between approaches taken by the world’s two biggest emitters of carbon, the US and China.
Carl