Observed changes in the thermal stucture of the atmosphere radiosonde-based temperature measurements from the data set by Oort, and expressed as total least-squares linear trends (Celsius) over the 25-year period May 1963 to april 1988. Source: Santer et al, A search for human influences on the thermal structure of the atmosphere, Nature, Vol 382, 4 July, 1996, p39
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