To: Land Shark who wrote (997070 ) 1/29/2017 1:28:44 PM From: Brumar89 Read Replies (2) | Respond to of 1571540 Homogenization of temperature data makes Capetown South Africa have a warmer climate record Anthony Watts / 4 hours ago January 28, 2017 Playing around with my hometown data, I was horrified when I found what NASA had done to it. Even producing GISTEMP Ver 2 was counterfactual. Guest essay by Philip Lloyd The raw data that is fed to NASA in order to develop the global temperature series is subjected to “homogenization” to ensure that it does not suffer from such things as the changes in the method of measuring the mean temperature, or changes in readings because of changes in location. However, while the process is supposed to be supported by metadata – i.e. the homogenizers are supposed to provide the basis for any modification of the raw data. For example, the raw data for my home city, Cape Town, goes back to 1880: data.giss.nasa.gov [ That shows the same thing we had in the US - warming culminating in the 1930's, then cooling into the 1970's. Interesting Cape Town SA was going through the same temperature changes the US was. ] The warmest years were in the 1930’s, as they were in many other parts of the globe. There was then a fairly steep decline into the 1970’s before the temperature recovered to today’s levels, close to the hottest years of the 1930’s. In NASA’s hands, the data pre-1909 was discarded; the 1910 to 1939 data was adjusted downwards by 1.1deg C; the 1940 to 1959 data was adjusted downwards by about 0.8 deg C on average; the 1969 to 1995 data was adjusted upwards by about 0.2 deg C, with the end result that GISS Ver 2 was:- [ Wow, what distortion! ] Being curious, I asked for the metadata. Eventually I got a single line, most of which was obvious, latitude, longitude, height above mean sea level, followed by four or five alphanumerics. This was no basis for the “adjustments” to the raw data. Which should I believe? The raw data showed a marked drop from the 1940’s to the 1970’s, which echoed similar drops elsewhere. Time magazine covers showed the 1970’s were indeed cold. The raw data is probably accurate. The homogenized data is certainly not. It is difficult to avoid the conclusion that “homogenization” means “revise the story line” and “anthropogenic global warming” really means “humans changed the figures”. Prof Philip Lloyd, Energy Institute, CPUT, SARETEC, Sacks Circle, Bellvillewattsupwiththat.com