Figure 4: Climate model results for Heinrich Stadial 1.
From: Pronounced interannual variability in tropical South Pacific temperatures during Heinrich Stadial 1
Relative response of Pacific interannual SST variability for HS1 simulated by the coupled general circulation model CCSM3 (ref. 37). The difference between HS1 and modern climate relative to the latter is shown for the standard deviation (s.d.) of modelled monthly SST anomalies in the interannual El Niño-Southern Oscillation band of CCSM3 (1.5–7 years). A value of 0.2 indicates a 20% higher s.d. of interannual SST anomalies during HS1 relative to modern conditions, for example, near Tahiti (white dot). A ~78% higher s.d. of interannual SST anomalies is indicated for the NINO3.4 region in the central equatorial Pacific (170°–120°W, 5°N–5°S). For the relevant areas in the equatorial Pacific and near Tahiti, the difference between the s.d. for HS1 and modern climate is statistically significant at the 90% level using an F-test (for details see Supplementary Fig. S12). Note the irregular contour interval.
