File:GISTEMPvsIPCC1990.png

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English: Comparison of Models from Ch. 6 of IPCC First Assessment Report (FAR) published in 1990 to current observations. Data from figure 6.11 b. Scenarios as described therein.
  • equilibrium sensitivity used is 2.5 deg C/doubling. IPCC also ran with 4 deg C/doubling and 1.5 deg/doubling. The current best estimate is around 3 deg. C, so the 2.5 deg /doubling is the model used.

Notes:

  • BaU=Business as Usual, however it should be noted that business did not go as usual due to the implementation of the montreal protocol which substantially reduced CFC emissions.
  • Added 0.71 to GISTEMP to get "relative to prehistoric." 1975 value for the IPCC predictions was 0.71 and average of GISTEMP from 1970-1980 was less than 0.01 from zero.
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Author Sailsbystars

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