环境因子对南海土台风“蝴蝶”与“银河”强度的影响*

doi:10.11978/2017073

Abstract

Abstract:

We selected two rapidly intensifying, locally-originated typhoons Wutip (1321) and Mirinae (1603), and analyzed upper- and low-level circulations, vertical wind shear, and ocean heat content in and around the South China Sea during typhoons’ passages over the sea. We also used WRF (Weather Research and Forecasting Model) model to discuss the environmental factors for their different intensities. Although the underlying conditions were more favorable for Mirinae, it did not develop into a strong typhoon due to weak upper- and low-level circulations and strong vertical wind shear. On the contrary, Wutip developed into a super typhoon rapidly due to the cold southward airflow and the outburst of warm humid air from the southwest. The results from WRF model’s sensitivity experiments about the effect of sea surface temperature (SST) on the intensity of locally-originated typhoon indicated that locally-originated typhoon intensity and SST have nonlinear positive correlation. However, as SST increases, the intensification trend of locally-originated typhoon slows down. From July to September, the SST in the South China Sea is higher than 28℃, meeting the condition for typhoon intensification. Therefore, attention should be paid to different environmental factors other than SST in locally-originated typhoons’ forecast in the South China Sea.

Key words: locally-originated typhoon, environmental factor, sea surface temperature (SST), moisture flux

Haoliang WU, Song HU. Effect of environmental factors on the intensity of Typhoons Wutip and Mirinae in the South China Sea[J].Journal of Tropical Oceanography, 2018, 37(3): 26-34.

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实验	SST设置	实验设置
EXP1	关闭	FNL海温场不随时间变化(过程不变)
EXP2	打开	FNL自带海温场每6h变化(过程变化)
EXP3	打开	FNL自带海温场降低1℃每6h变化(过程变化)
EXP4	打开	FNL自带海温场升高1℃每6h变化(过程变化)

Effect of environmental factors on the intensity of Typhoons Wutip and Mirinae in the South China Sea

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