Hadley Cell Observations Summary (小结) evew Temperature field:the equator-pole temperature gradient is much smaller than the RE temperature gradient. Wind fields:meridional winds strongest at tropopause and surface; vertical velocity strongest at mid-level of the troposphere. Jets(zonal winds):strong subtropical jet at upper level with its maximum in the latitudes at the edge or just poleward of the descending branch of the Hadley cell;surface winds-easterlies near the equator and westerlies in the extratropics. Strong seasonal variations:in summer or winter,Hadley cell always appears as a strong single cell across the equator with the ascending branch in the tropics of the summer hemisphere. 授课教师：张洋2授课教师：张洋 2 Hadley Cell - Observations n Summary （⼩结） n Temperature field: the equator-pole temperature gradient is much smaller than the RE temperature gradient. n Wind fields: meridional winds strongest at tropopause and surface; vertical velocity strongest at mid-level of the troposphere. n Jets (zonal winds): strong subtropical jet at upper level with its maximum in the latitudes at the edge or just poleward of the descending branch of the Hadley cell; surface winds-easterlies near the equator and westerlies in the extratropics. n Strong seasonal variations: in summer or winter, Hadley cell always appears as a strong single cell across the equator with the ascending branch in the tropics of the summer hemisphere. Review