THE DIAGNOSTIC ANALYSIS AND NUMERICAL EXPERIMENT ABOUT THE EFFECT OF TYPHOON DANAS(1324) ON TYPHOON FITOW(1323)
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摘要: 利用FNL资料和WRF模式进行数值试验，并在此基础上研究了1324号台风Danas对1323号台风Fitow的影响特征。分析结果表明，台风Fitow登陆前、后的强度变化及其东边界与台风Danas相连的水汽输送通道的变化直接相关。台风Fitow登陆前，其水汽输入主要是由副热带高压西南侧环境场的偏东气流带来，而上游台风Danas截取了环境场输送给台风Fitow的水汽，抑制了Fitow的发展。但在台风Fitow登陆后，台风Danas环境场的水汽反过来起到转运作用，增加了Fitow的水汽收入，加剧其北侧的强降水。台风Danas以水汽通道为纽带影响台风Fitow登陆前的强度和在陆上非对称降水的分布。此外，台风Danas的北上影响了副热带高压的强度，使其东退且改变台风Fitow的引导气流，影响了Fitow的登陆位置；并在Fitow登陆后施加了偏南引导气流，令其逆时针打转。Abstract: In recent years, some binary tropical cyclones often bring serious disasters to the affected areas, so the interaction between the two typhoons has received more and more attention.The effect of typhoon Danas(1324) on the typhoon Fitow(1323) was studied with the FNL data and WRF model.The results show that the intensity of the change of Fitow while before and after landing is directly related to the change of the eastern boundary water vapor transport channel, which link with Danas.Before Fitow landing, the water vapor channel is mainly caused by the environment field easterly stream on the southwest side of the subtropical high.Danas at the upstream intercepts environmental field delivering water vapor to Fitow and inhibited its development. However, Fitow after landing, Danas on the environment of the water vapor in turn plays a role in the transport, increasing the Fitow of the water vapor income, and increasing its north side of the strong precipitation.Danas, through water vapor as a link, affect the intensity of Fitow before its landing and Fitow's asymmetric precipitation distribution onshore.In addition, Danas's northward movement affects the intensity of subtropical high, causing the subtropical high's east back, changing Fitow's steer flow, affecting the Fitow landing position, and Fitow's counterclockwise spinning around the landing by applying the southward steer flow.
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图 1 Fitow、Danas的路径图（a）和Fitow（b）、Danas（c）的强度随时间变化（实心线段为气压，左坐标，单位：hPa；空心线段为风速，右坐标，单位：m/s）及以Fitow为中心10 °×10 °区域边界整层水汽输送量随时间变化（d，单位：g/(m·s)，图例从上到下依次是东、西、北、南边界水汽输送量、总水汽流入流出量）
图 6 06—08时实况（a，资料：中国自动站与CMORPH融合的逐时降水量0.1 °×0.1 °网格数据集）和控制试验（b）及敏感性试验（c）的累计降水
单位：mm。仅显示100 mm以上的降水分布。
图 7 0518（a、b）、0700（c、d）时次ctrl试验（a、c）和rm试验（b、d）中的9点平滑后的500 hPa位势场
(黑等值线，单位：10 gpm)以及850 hPa风速大于15 m/s的低空急流（绿色箭头）分布
图 9 ctrl试验（a）、rm试验（b）和各边界rm-ctrl（c）以Fitow为中心10 °×10 °区域整层大气总水汽流入流出量(实线)、东边界水汽流入流出量(实心方框实线)、西边界水汽流入流出量(点线)、南边界水汽流入流出量(长虚线)和北边界水汽流入流出量(空心方框实线)
纵坐标单位：g/(m·s)。
图 10 ctrl试验（a、c、e、g、i、k）和rm试验（b、d、f、h、j、l）的0612（a、b）、0618（c、d）、0700（e、f）、0706（g、h）、0712（i、j）、0718（k、l）时次的逐6 h累计降水
单位：mm。仅显示20 mm/(6 h)以上的降水分布。
表 1 Fitow和Dannas的相对位置
时间/UTC 间距/km 经度差/°E 纬度差/°N 4日12时 1 763.53 15.6 6.1 4日18时 1 726.28 15.4 5.8 5日00时 1 657.61 14.6 6.1 5日06时 1 574.58 13.8 6.0 5日12时 1 527.97 13.6 5.5 5日18时 1 472.95 13.3 5.0 6日00时 1 393.98 12.7 4.6 6日06时 1 297.43 12.0 4.0 6日12时 1 262.68 11.7 4.0 6日18时 1 204.86 11.5 3.1 7日00时 1 155.29 11.4 1.7 7日06时 1 094.14 11.0 0.1 
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