Are intraseasonal summer rainfall events micro monsoon onsets over the western edge of the South-Asian monsoon?

作者：Syed F S^*; Yoo J H; Kornich H; Kucharski F

来源：Atmospheric Research, 2010, 98(2-4): 341-346.

DOI：10.1016/j.atmosres.2010.07.006

• Onset
• Pakistan
• Intraseasonal variability
• Monsoon
• Active phases

A thermodynamic structure leading the active phase (AP) of the Western Edge of the South-Asian Monsoon (WESAM) is investigated The APs seems to have significant contribution in the mean seasonal rainfall in the region A few days before APs the upper level warm anomaly appears over the north Hindu Kush-Himalaya (HKH) region and It is reinforced by surface heating yielding the column average warming The height anomalies are baroclinic with the low-level anticyclone being located at the east of warming The low-level anticyclone causes the moisture convergence at the core WESAM region As the region keeps warming, the height anomalies and associated low-level convergence become stronger The AP starts when the low-level moisture convergence is strong enough to overcome the preexisting stable atmospheric condition due to the upper level warming The proposed mechanism of APs has some resemblance with larg

• 出版日期2010-12