Writing in the Globe and Mail Economy Lab Blog on Thursday may 19, Andrew Leach discussed Emissions: Peter Kent’s 178 millon-ton challenge.
It may be his most important task, and setting Canada’s GHG policy course for the next four years will not be an easy one for Environment Minister Peter Kent. By his own admission, meeting Canada’s GHG goals will be a daunting challenge and will require stringent regulations on oil and gas, electricity generation, transportation, and other industrial sectors.
As of today, Monday May 23, there are over 800 comments from readers. One of the threads of conversation was triggered by a remark from Richard Wakefield to the effect that the world is not warming but that it’s getting less cool. In other words he claims that the daily maximum temperatures (TMax) are not rising but the minimum (TMin) is doing so.
I argued that the average temperature of, say, 24 per day once per hour, is a better measure of warming and cooling, approximating the integral with respect to time of the temperatures because it is a better measure of the total heat received in any given day.
In any case, I and “SoundOff” took issue with his assertion and found some counter examples which do show warming. He was looking at individual sites rather than using regional or global values published by institutions like NASA/NOAA and the UAE/CRU.
SoundOff had a look at “Toronto Summer/Winter Temperature Trends” (click on the image for a full-size view):
He determined trends for summertime (June – August) expressed as number of degrees Celsius change per decade of
ΔTMin=0.273 °C and
and for wintertime (December – February) of
I chose to do a linear least squares fit of temperatures for our northernmost weather station with a continuous record from 1947 to 2010 (Eureka, Axel Heiberg Island, Nunavut) and found that July
ΔTMin=0.118 °C and
The Eureka data were downloaded from the Canada Weather Station Map
These results clearly show that Richard’s assertion about lack of warming is wrong at these locations. Taken with other measurements from reputable agencies, his opinion does not stand up to scrutiny.