Extended Data Fig. 2: Vertical and horizontal divergence do not explain the amplification index.
From: Hot extremes have become drier in the United States Southwest
a, The composite vertical profile of July–August-September specific humidity from ERA5 on years in the top tercile (33%) of the amplification index minus the bottom tercile. b, The composite July–August-September vertically integrated moisture divergence from ERA5 on years in the top tercile of the amplification index minus the bottom tercile. c, The time series of the amplification index (orange) and the Southwest-average vertically integrated moisture divergence (teal). (d-i) As in (b)-(c), but for July, August, and September vertically integrated moisture divergence separately. Vertically integrated moisture divergence is the total per day.
