Figure 4

Low troposphere meridional humidity advection. DJFM mean, vertically integrated low troposphere (975–700 hPa) meridional humidity advection (in g/kg/day), for (a) HiFo and (b) deviations of the HiSa (continuous orange line), R8Fo (dashed green line), and R8Sa (dashed red line) relative to HiFo. The Amazon Basin latitude range is delimited by vertical black dashed lines. Negative advection indicates decreased humidity in the direction the wind is blowing.