Category Archives: Atmospheric science

Was 2015 really the “Hottest year Ever”? – CO2 Thermometer says No

A reader reminded me of this issue and asked if I had checked the “carbon dioxide thermometer”. This concept arises from the fact that in warm years carbon dioxide outgasses from oceans into the atmosphere while in cool years the opposite takes place with carbon dioxide moving from the atmosphere into oceans.

This chart shows many correlations showing that the “carbon dioxide thermometer” is alive and well and is saying that 1998 is still the hottest year in the last four decades. So the “CO2 thermometer” says the satellites with their automated 24/7 pinging of the entire planet are to be trusted before HadCRUT4 which on land derives data mostly from ever expanding urban areas which are warming due to the urban heat island effect. In addition, temperature series such as HadCRUT4 are being adjusted cooler in earlier years thus increasing the warming trend.

Huge variations in Australian satellite temperature trends over 37 years 1979-2015

Comparing data for RSS V3.3, UaH V5.6 and the UaH V6Beta for the exact 37 years 1979-2015 (data from KNMI Climate Explorer using the Australian mask) – The trends using the Linest function in Excel are RSS V3.3 – 0.26°C, UaH V5.6 – 0.58 and the UaH V6Beta is an eye watering 0.88. IMHO huge differences shown in these KNMI charts.
First RSS –

Then UaH V5.6 –

Finally UaH V6Beta

I have posted on these issues a couple of years ago – I think the differences in overall trend are increasing.
Warming departure in UAH lower troposphere satellite temperatures compared to RSS over the period 2005-2006
and –
Difference between UAH and RSS satellite lower troposphere T anomalies has a distinct step change 2004-2005 over the USA 48 States – not as marked as Australia

Series of articles on climate and the IPCC by Peter F Gill a UK physicist

Peter has examined climate issues for many years and he has recently got a series of articles in a UK newspaper, the Dorking and Leatherhead Advertiser.
29 March 2015 – A Different Approach: Changing climates
26 April 2015 – A Different Approach: Greenhouse gases and climate sensitivity
12 August 2015 – Climate change explained
4 October 2015 – The findings of the Intergovernmental Panel on Climate Change

Marshall Islands foreign minister Tony de Brum claims “…yet another cyclone. Climate change has arrived,” he tweeted.

The ABC reports – Chaotic unseasonal storms strike Marshall Islands and Guam as eight systems threaten western Pacific
I am too busy to attempt to dig out data on this – make sure you include the word cyclone in any comment and I can rescue same if it gets caught in the spam queue. Same goes for earlier Raquel post. Not sure where the eight systems are.

US researchers highlight IPCC inconsistency over solar variability in relating the post 2000 reduction in stratospheric ozone to the ground level temperature pause

Read The Pause in the Stratosphere by Steven Capozzola – an interesting mechanism to explain the much vilified temperature pause in the troposphere. RSS temperature timeseries show what Steven Capozzola is talking about.
The TLT trend shows the temperature pause in the lower troposphere with crystal clarity. While the TLS trend shows the cooling trend halted from ~late 1990’s onwards.
This chart from report 56 at this WMO page shows how global stratospheric ozone levels have bounced since the 1990’s.