Figure 4.25

Asian monsoon system. (A) In summer, the ITCZ draws air north (shown with red arrows) from the Indian Ocean. This humid onshore airflow brings summer rains. (B) In winter, air flows away from the Siberian high over central Eurasia. As a result, dry offshore winds develop. The timing and strength of the summer monsoon rains depend on three factors: onshore airflow, orographic uplift, and the ITCZ.