Helpful comments from the NY Times tied to the recent Amazon rainforest study. The story draws attention to how forests serve to soak up a substantial portion of any excess CO2 that is added to the atmosphere, as humans are now doing. The Amazon forest and certain others have been shown to be losing that capability, and still more forests could follow. The overall “sink mechanism,” so far beneficial, will play a critical role in our climate’s future, and needs to be protected.
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Is the Gulfstream (or AMOC) weakening? A new report from a group of renowned scientists claims that to be so, and is already creating a sensation. The slowdown is thought to be caused by infusions into the North Atlantic of cold, low-salinity meltwater from Greenland’s ice sheet, and is expected to continue. One of the near-term effects is seen as a sharp rise in sea level along parts of the east coast of the U.S., while another would be an increase in the severity of regional storms.
A more thorough and very clear review of the study, written by one of the authors, Stefan Rahmstorf, can be found at this link from the RealClimate website:
Finally, in this short video, another one of the authors, Michael Mann, explains why the slowdown is not likely to result in a complete stoppage, similar to that which is thought to have caused the Younger Dryas freeze-up event some 12,000 years ago.
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Expectations for unusual sea level rise on the Mid-Atlantic coast. In this fine video several reasons are advanced, which all take some explaining. One of them shows why a weakening of the Gulfstream, as described above, would allow water levels to rise as much as three feet off the western flank of the stream.
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Climate tipping points of the risky type need better policy treatment. That is the conclusion reached by a study group formed by several universities. It is profoundly logical, but not the sort of thing that politicians normally pay much attention to. Here are the specific tipping points that were considered, several of which should currently sound familiar: “….a collapse of the Atlantic meridional overturning circulation; irreversible melt of the Greenland Ice Sheet; collapse of the West Antarctic Ice Sheet; dieback of the Amazon rainforest; or an increase in the amplitude of the El Niño Southern Oscillation.” Perhaps, as we have just learned, the East Antarctic Ice Sheet would make a nice addition to the list.
Carl