Fig. 2From: Externally forced symmetric warming in the Arctic and Antarctic during the second half of the twentieth centurySurface temperature changes (K) in the a, b historical simulation and the contributions from c, d GHG, e, f AER, and g, h OD over the two polar regions during 1955–2000 relative to 1945–1965 for GHG and AER and 1955 for OD. The area-weighted surface temperature anomalies are labeled in the corresponding panelsBack to article page