| Application of a Typhoon Initialization Scheme Based on the Incremental Analysis Updates Technique in a Rapid Update Cycle System |
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| 作者姓名： | 陈 锋 董美莹 冀春晓 邱金晶 |
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| 摘 要： | Initialization of tropical cyclones has an important role in typhoon numerical prediction. This study applied a typhoon initialization scheme based on the Incremental Analysis Updates (IAU) technique in a rapid refresh system to improve the prediction of Typhoon Lekima (2019). Two numerical sensitivity experiments with or without application of the IAU technique after performing vortex relocation and wind adjustment procedures were conducted for comparison with the control experiment, which did not involve a typhoon initialization scheme. Analysis of the initial fields indicated that the relocation procedure shifted the typhoon circulation to the observed typhoon region, while the wind speeds became closer to the observations following the wind adjustment procedure. Comparison of the results of the sensitivity and control experiments revealed that the vortex relocation and wind adjustment procedures could improve the prediction of typhoon track and intensity in the first 6-h period, and that these improvements were extended throughout the first 12-h period of the prediction by the IAU technique. The new typhoon initialization scheme also improved the simulated typhoon structure in terms of not only the wind speed and warm core prediction but also the organization of the eye of Typhoon Lekima. Diagnosis of the tendencies of variables showed that use of the IAU technique in a typhoon initialization scheme is efficacious in resolving the spurious high-frequency noise problem such that the model is able to reach equilibrium as soon as possible.
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| 关 键 词： | Typhoon initialization Vortex relocation Incremental Analysis Updates Numerical simulation Lekima |
| 收稿时间： | 2020-05-18 |
Application of a Typhoon Initialization Scheme Based on the Incremental Analysis Updates Technique in a Rapid Update Cycle System |
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| CHEN Feng,DONG Mei-ying,JI Chun-xiao and QIU Jin-jing.Application of a Typhoon Initialization Scheme Based on the Incremental Analysis Updates Technique in a Rapid Update Cycle System[J].Journal of Tropical Meteorology,2020,26(4):428-440. |
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| Authors: | CHEN Feng DONG Mei-ying JI Chun-xiao and QIU Jin-jing |
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| Institution: | Zhejiang Institute of Meteorological Sciences, Hangzhou 310008, P.R. China |
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| Abstract: | Initialization of tropical cyclones has an important role in typhoon numerical prediction. This study applied a typhoon initialization scheme based on the Incremental Analysis Updates (IAU) technique in a rapid refresh system to improve the prediction of Typhoon Lekima (2019). Two numerical sensitivity experiments with or without application of the IAU technique after performing vortex relocation and wind adjustment procedures were conducted for comparison with the control experiment, which did not involve a typhoon initialization scheme. Analysis of the initial fields indicated that the relocation procedure shifted the typhoon circulation to the observed typhoon region, while the wind speeds became closer to the observations following the wind adjustment procedure. Comparison of the results of the sensitivity and control experiments revealed that the vortex relocation and wind adjustment procedures could improve the prediction of typhoon track and intensity in the first 6-h period, and that these improvements were extended throughout the first 12-h period of the prediction by the IAU technique. The new typhoon initialization scheme also improved the simulated typhoon structure in terms of not only the wind speed and warm core prediction but also the organization of the eye of Typhoon Lekima. Diagnosis of the tendencies of variables showed that use of the IAU technique in a typhoon initialization scheme is efficacious in resolving the spurious high-frequency noise problem such that the model is able to reach equilibrium as soon as possible. |
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| Keywords: | Typhoon initialization Vortex relocation Incremental Analysis Updates Numerical simulation Lekima |
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