The BomWatch blog has published Day/Night temperature spread fails to confirm IPCC prediction examining max min and DTR temperature data from the BoM purpose built weather station Giles 13017 in far eastern WA near the WA-SA-NT border junction. The main points of the BomWatch article is that Giles is a pristine site and that DTR has not closed as the IPCC expects. In 2014 I blogged on the loony-toon BoM adjustments to Giles for ACORN 1. So I have a 2013 Giles Basic Climatological Station Metadata pdf – a sort of station diary – on my HDD. A check of the Giles pdf shows that a gravel road that ran through the instruments area near the screen was bitumen sealed in the 12 months between the Sep 2011 and Sep 2012 site maps. Ken Stewart blogged on the Giles site in 2019 The Wacky World of Weather Stations: No. 171- Giles (WA) and Ken shows Google Earth images that indicate the screen was ~20m from the sealed road. So the sealed road would introduce some quota of UHI into the data. Ken also pointed out that a 2019 site photo from JoNova shows the whole area of the screen fenced rectangle covered by gravel with no grass – Ken rates the site “non-compliant”. The 2013 Giles Basic Climatological Station Metadata pdf shows on page 23 Station Equipment History that on 1st June 1992 under Air Temperature that – “INSTALL Temperature Probe – Dry Bulb (Type Rosemount)”.
So prior to 1st June 1992 temperatures would have been recorded by liquid in glass thermometers probably in older/larger type Stevenson screen. The post 1992 probe would produce readings over very short periods of seconds which would lead to higher temperatures being recorded than would have been recorded by a liquid in glass thermometer.
via Errors in IPCC climate science
January 26, 2022 at 01:08AM
Iowa Climate Science Education 