Observed features Summary: A monsoon climate is characterized by the obvious seasonal reversal of wind,precipitation and atmospheric circulation. From a global view:south asian monsoon is associated with the seasonal migration of ITCZ and Hadley circulation,which also plays an important role in the global meridional moisture and latent energy transport. South asian monsoon exhibits obvious sudden onset,with the low-level winds and the whole monsoonal circulation built in two weeks. Intra-seasonal variation:show periods in 4-5 days,10-20 days and 40-50days. Inter-annual variation:Relatively weaker precipitation occurs during El Nino years. 授课教师：张洋2授课教师：张洋 2 Observed features n Summary: n A monsoon climate is characterized by the obvious seasonal reversal of wind, precipitation and atmospheric circulation. n From a global view: south asian monsoon is associated with the seasonal migration of ITCZ and Hadley circulation, which also plays an important role in the global meridional moisture and latent energy transport. n South asian monsoon exhibits obvious sudden onset, with the low-level winds and the whole monsoonal circulation built in two weeks. n Intra-seasonal variation: show periods in 4-5 days, 10-20 days and 40-50 days. n Inter-annual variation: Relatively weaker precipitation occurs during El Nino years