Figure 2

Spatial pattern of indices of warm-temperature extremes. Warm indices: summer days (a), tropical nights (b), warmest days (c), warmest night (d), warm days (e), warm nights (f). For description of indices, see Supplementary Table S1. The size of the circles is the degree of changing. Positive trends are shown as pluses, negative trends as minuses. A green symbol indicates significance at the 5%; a white symbol represents non-significant trends. The maps are generated with Arc Map Ver 10.1 (http://www.esri.com/software/arcgis/arcgis-for-desktop).