&会岛 Hadley Cell (review) Theories Review Held-Hou model (1980) Meet the model(diagram) y Conservation of angular momentum Angular momentum V conserving (axisymmetric) Thermal wind balance Distribution of temperature aCOSΦ Steady flow Latitude extent of Hadley Cell V Strength of Hadley Cell a Y Weak zonal flow at surface Distribution of upper westerly (due to friction) Distribution of surface winds Zonal flow is balanced (thermal wind relation) 受课教师：张洋 5授课教师：张洋 5 Hadley Cell (review) - Theories n Held-Hou model (1980) Meet the model (diagram) Conservation of angular momentum Thermal wind balance Distribution of temperature Latitude extent of Hadley Cell Strength of Hadley Cell Distribution of upper westerly Distribution of surface winds ⌦ a cos ￾ a ￾ Angular momentum conserving (axisymmetric) Weak zonal flow at surface (due to friction) Zonal flow is balanced (thermal wind relation) Steady flow Review