Climate Letter #614

The meaning of February’s sensational temperature report.  A number of points are covered here with all the graphics.  I was especially interested in the chart from Japan showing just all of the Februaries since 1890.  Their straight red line would be improved by having an upward bend starting around 1975, stopping now at a little over the 0.2C level instead of 0.1, which would make this February a bit less off-trend.  Anyway, observe how 1998 and a number of other peak Februaries were all immediately followed by much lower numbers, some dropping below the red line, for a good many years.  Maybe that will happen again, as El Nino fades, but not necessarily.  The next five years will be of crucial importance.

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How to smooth out the global warming trend.  There is quite an art to neutralizing all sorts of exogenous factors that prevent atmospheric readings from connecting up in an orderly manner with the more fundamental trend of the warming oceans, as explained and illustrated quite well in this post.  Don’t miss Kevin Cowtan’s short video lecture at the very end.
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How Antarctic ice shelves are attacked from their underside by ocean currents.  A new study adds some helpful information to how this works, and its importance for the sake of holding back coastal glacier movement.  For example, the researchers discovered “upside-down rivers” which can be tens of miles long and up to 800 feet in depth, in widespread locations.  There is more.
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The effect of air pollution on global temperatures.  Here is a report of two new studies of this known cooling effect, which blocks solar radiation from reaching the surface.  Cleaning up the air, as China is desperately hoping to do, with India right behind, will cause temperatures to increase, but it is difficult to calculate just how much. Climate modellers are trying hard to catch up.
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The new way to capture offshore wind—how it works.  This technology was mentioned in a recent letter.  Here is a more complete description of what it is all about and why there is interest, with a field test coming soon.
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Sodium-ion energy storage evaluated.  This is a futuristic technology that looks best-adaptable to stationary applications.  The same professor who invented lithium-ion batteries is directly involved in development, as part of a solid looking group that has high ambitions.
Carl

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