Climate Cooling Started In 2017 ?
Joannes Sevenhans
Alcatel Academy Distinguished Member 2001 ...IEEE Fellow 2000 for contributions to the design of solid state telecommunication transceivers ...PhD 1984 KULeuven ...Semi-retired ...Always looking for a next project ...
"CO2 Climate Sensitivity Estimates" are declining in the present millennium according to the bleu as well as the red CO2-climate sensitivity experts over the past 2 decades but ...
That is the question ?
We see global cooling now for both summer & winter since 2017 ...
Sun spot counters have seen solar activity weakening since 1977 after the "Modern Maximum" that started after the Second World War.
Finally it took 2017-1977 = 40 years to see the result of solar weakening in the solar W/m2 heat irradiance ranging less than 4W/m2 peak to peak between 1363W/m2 and 1367W/m2 over the past 5 centuries in history.
Over an 11 year solar cycle, irradiation can now go up & down 1W/m2 from 1365,5W/m2 to 1366,5W/m2.
Since1977 we see that the "11 year smoothed" solar irradiance did now go down about -0,4W/m2 over the past 4 decennia or -0,1W/m2 per 11 year solar cycle approximately.
This -0,4W/m2 over the past 40 years or -0,1W/m2 per 11 year solar cycle, resulted in +0,8% long term average Antarctic ice extent gain and the 11 year solar cycle 24 was able to make an 11 year swing of +20% to -20% ice extent variance now on the 40 year average ice extent.
Peak to peak variance +/-20% now but +/-3,5% average variance over 40 years.
Next question now : More or less solar irradiance makes less Antarctic ice extent or more Antarctic ice extent ?
It is all a matter of time & time/phase delay between the solar irradiance 11 year cycle and the ice extent 11 year cycle ...
But :
So there is a travel time delay for the equator heat to get to the pole ice by heat convection and or heat conduction via the ocean and or via the atmosphere ...
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Heat Convection <=> Heat Conduction
For example the Gulf Stream does carry some heat but mainly from equator to Arctic.
For conduction it takes about half an 11 year solar cycle to carry equator heat to Antarctic pole and or Arctic pole ice extent.
The result of this "heat conduction travel delay" you can see now that solar cycle 24 succeeded to get in synchronism with the Antarctic ice extent.
More solar irradiation heat results in more Antarctic ice extent ???????
Off-course not !!!!!
The ice melt/freeze cycle has 5-6 year delay on the solar heat irradiance cycle because of the conduction travel delay from equator irradiance to pole ice ...
Conclusion :
The ice Antarctic melt/freeze cycle has 5-6 year delay on the solar heat irradiance cycle because of the conduction travel delay from equator irradiance to pole ice ...
As a result we start to see now a growing amplitude in an 11 year cycle on the Antarctic ice extent gain/loss curves and we see this growth as well in the annual average as in the annual minimum and also in the annual maximum ... during solar cycle 24.
But solar cycle 25 is now surprising all of us in this strange speed of the rising slope compared to the predicted values ...
Anyway :
In climate science there are too many unanswered questions and too many unquestioned answers ...
But :
Health & Climate & Energy are really very complicated and delicate politico-scientific stuff and also socio-economic stuff but we do the best we can and try to explain it as simple as possible but not simpler than that in the group :
Technical expert - Mining & Energy - Project lead
1 年Very interesting, thanks for sharing.
Principal at Critical Point
1 年Nice work!