McLean on clouds
Oct 30, 2014
Bishop Hill in Climate: Models, Climate: Surface

John McLean, of James Cook University in Australia, emails with details of a paper he has just had published in Atmospheric and Climate Sciences about the warming of the planet at the end of the last century. He adds a useful layman's summary.

The paper ...

- indicates that the temperature pattern can be attributed to a sequence of events, namely a shift in the prevailing ENSO conditions, then a reduction in total cloud cover and then a shift on cloud (decrease in low level cloud that was largely offset by an increase in mid and upper level cloud)

- uses the Trenberth, Fasulo & Kiehl energy balance diagram to show that the loss in total cloud cover caused an increase in heat energy being absorbed at the Earth's surface that was greater than the increase that IPCC 5AR claims was due to greenhouse gases

- indicates that greenhouse gases played little if any part in the warming, which not only refutes the IPCC's belief or opinion but also means that there is negligible, or even no, 16 or more years' of "missing heat" to be found.

- shows the changes in cloud cover and temperature both as global averages and then for the six latitude bands each of 30 degrees, the latter indicating the changes in cloud cover applied to most latitude bands except the Antarctic and to a less extent 30S-60S.

- doesn't attempt to identify the reason for the reduction in total cloud cover or the shift from low level cloud.

The paper is open access and can be seen here.

Update 7.52am, 31.10.2014 John McLean commented  at 9.20pm last night that he is a PhD student, not a professor. TM

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