Fig. S2.

Climate zones in Amazon identified according to start of dry season: April to June in the south, July to September at the center, and October to March in the north. (A) The dry season is defined with monthly precipitation less than either 100 mm or one-third of the annual precipitation range (8). The 1° precipitation data are averaged from monthly 0.25° precipitation data from TRMM (TRMM Product 3B43) between 1997 and 2015. (B) Climate zones as defined in our study. The map illustrates the distinct spatial variation of dry season progression identified by previous studies (17, 48).