| Summary: | 碩士 === 國立中央大學 === 大氣物理研究所 === 102 === The microphysics schemes have been applied to many numerical studies to
understand its influence to the track, intensity, structure and the precipitation type of typhoons. However, there are not many typhoon simulation studies on the CCN concentration. Recently, the research on the effect of the aerosol to the atmospheric environment as become more important, and many studies show that, the change of aerosol is indeed playing an important role in the microphysical processes.
Therefore in this research we used the WRF V3.3.1 to conduct a series of modeling study on Typhoon Nari(2001). We used the WDM6 microphysic scheme in this study, and we modified the initial CCN number concentration (by increasing 10 and 100 times), starting by the simplified of environmental condition (ocean), without the terrain.
From the simulation on pure ocean environment, we can found, if we increase the initial CCN number concentration, the typhoon will produce more precipitation particles in smaller sizes, relatively waker eyewall’s updrafts, and precipitation particle can be translated far away from the center of typhoon. As a result, the intensity of precipitation in eyewall area is weaker, the spatial distribution of each hydrometer also different; from the condensational heating rate vertical profile, the difference is obvious too. Thus we can infer that the difference on CCN concentration will greatly affect the tropical cyclone’s intensity and its structure evolution.
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