Remember Darwin Dearest? You know, how Willis Escherbach manipulated the data from Darwin Australia to make a warming trend into a cooling. Tim Lambert dealt with this in detail and Willis of course has a number of priors.
What Willis forgot to correct for according to the Australian Bureau of Meteorology was
Well guess where the tortured numbers pop up again. Three points to the guy in the corner who said, gee, that's just the sort of thing that Joe D'Aleo would love and five to the lady in the black hat who said, that's so good it should be featured on the new KUSI blockbuster show we set our TIVO to capture when we went to the tea party. It would be nice to see a libel suit dropped on these clowns, but it's time to saddle up and point out that the icecap man is melting. Oh yeah, here is the "programming expert", please help undress him
A change in the type of thermometer shelter used at many Australian observation sites in the early 20th century resulted in a sudden drop in recorded temperatures which is entirely spurious. It is for this reason that these early data are currently not used for monitoring climate change. Other common changes at Australian sites over time include location moves, construction of buildings or growth of vegetation around the observation site and, more recently, the introduction of Automatic Weather Stations.
The impacts of these changes on the data are often comparable in size to real climate variations, so they need to be removed before long-term trends are investigated. Procedures to identify and adjust for non-climatic changes in historical climate data generally involve a combination of:
- investigating historical information (metadata) about the observation site,
- using statistical tests to compare records from nearby locations, and
- using comparison data recorded simultaneously at old and new locations, or with old and new instrument types.
There is more of the usual, the number of stations has fallen over the past thirty years, etc. Pushback will be needed.