Geoscience Reference
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and 2004, the humidity near the surface in the northern SCS decreases. The
results indicate that, while a SST warming is concurrent with a moistening
ABL in front of the monsoon convection, this warming does not directly
contribute to the moistening. Above features can also be found in the year
of 2005 though, compared to 2003 and 2004, the strength of the monsoon
rainfall and associated wind are not as strong as those in 2003 and 2004.
AsshowninFigs.3(d)and4(d),lower-levelconvergencenotonly
coincides with the convection but also appears in front of the rainfall
maximum and is co-located with the region of maximum boundary-layer
humidity. This suggests that the convergence in the ABL is one of dominant
Fig. 6. The latitude-pressure cross-sections of the ECMWF vertical velocity (Omega,
shading and scales are shown by the bar in unit of 10
−
2
Pa/s) and AIRS air temperature
(contours, with an interval of 0.25
◦
C) averaged along 105
◦
E-120
◦
E. A domain average
over 105
◦
E-102
◦
Eandeq-20
◦
N is removed from the air temperature at each pressure
level.
