experiments with the GISS climate model
(Hansen et al., 1983, 1984). Differences between the 1 CO2 and 2 CO2 equilibrium experiments
were used to estimate greenhouse effects. Interpolated to Stykkishólmur, the warming annually
was about 4
C, but ranging over the course of the year between 4.1–4.3
C from November to
April, and between 3.6–3.8
C from June to September. Thus the wintertime warming exceeded
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