But
since TMax isn't increasing elsewhere in the world, then there is no increase in heatwaves because of AGW.
Not exact matches
There has certainly been none at Oxford, with mean annual
Tmax on a down trend of -0.07 oC p.a.
since 1958, while Heathrow, only about 40 miles away does show a rising trend of 0.034 oC p.a. which obviously could not possibly have anything to do with the explosive growth of air traffic there
since 1958.
Regressing changes in
Tmax on monthly changes in these variables as well as atmospheric CO2 shows significant positive roles for sun and rain in explaining temperature chnage
since 1958, but negative for atmospheric CO2.
Kevin Cowtan appears to have discovered that «modeled» «surface» temperature isn't comparable to the «observed» «surface» temperature
since the «observed» is a combination of land based (
Tmax + Tmin) / 2 and SST measured somewhere between the surface and a few meters below the surface.
Now
since we were on CO2 correlation, would you expect CO2 to have a higher correlation with ERSSTv4, BEST
Tmax or BEST Tmin?
Since 1950, it has been found that the global diurnal temperature range (DTR), the difference between the minimum temperature (Tmin) and the maximum temperature (
Tmax) of daily surface air temperature, has been temporally decreasing in several places all over the world.
We would anticipate that Tmin trend line should have slightly greater slope than that of
Tmax since the air at Tmin is denser than that at
Tmax if CO2 has any effect on warming the air for comparable air pressure.
http://www.drroyspencer.com/2012/04/ushcn-surface-temperatures-1973-2012-dramatic-warming-adjustments-noisy-trends/
Since NOAA encourages the use the USHCN station network as the official U.S. climate record, I have analyzed the average -LSB-(
Tmax + Tmin) / 2] USHCN version 2 dataset in the same way I analyzed the CRUTem3 and International Surface Hourly (ISH) data.
The raw data, from three separate places on the planet so far: Canada, Ireland and Australia, shows that summer
TMax is dropping
since 1900.
TMAX - TMIN day by day
since 1951 to 2007.
TObs doesn't look like such a good thing to use
since it relies on what time of day a human observer took a measurement, and that won't stay constant, but I have TMin and
TMax.
Since almost all of the USCRN stations now have over five years of data, correlating the
Tmax and Tmin against the data from the various classes of «selected» stations in this report should be the obvious first step in identifying siting issues.
Especially
since Tavg is just the average of Tmin and
Tmax.
Since there is a solar radiant bias for CRS and most MMTS, the Daily
Tmax is more closely related to local solar max.
Summer
TMax has been DROPPING
since the 1930's.