季風(fēng)渦旋對臺風(fēng)"煙花"路徑突變的影響

doi:10.12306/2022jms.0096

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季風(fēng)渦旋對臺風(fēng)"煙花"路徑突變的影響
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                        10.12306/2022jms.0096
                    
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中圖分類號:P458.124
基金項(xiàng)目:災(zāi)害天氣國家重點(diǎn)實(shí)驗(yàn)室開放課題(2021LASW-A14);2022年大學(xué)生創(chuàng)新訓(xùn)練省級一般資助項(xiàng)目(202210300075Y)

Effects of monsoon gyre on sudden track changes of Typhoon "In-fa"

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摘要:

臺風(fēng)"煙花"于2021年7月22日00時(shí)(世界時(shí), 下同)在臺灣島東側(cè)突然向北轉(zhuǎn)向,但美國、日本和中國的業(yè)務(wù)預(yù)報(bào)均沒有正確預(yù)報(bào)出該過程?；贜CEP/NCAR提供的全球再分析資料(Final Operational Global Analysis, FNL),采用Lanczos濾波方法分析發(fā)現(xiàn),臺風(fēng)"煙花"轉(zhuǎn)向前的西行減速主要受到與季風(fēng)渦旋有關(guān)的季節(jié)內(nèi)尺度環(huán)境引導(dǎo)氣流分量的影響,向北轉(zhuǎn)向及轉(zhuǎn)向后的向北加速則主要受到季風(fēng)渦旋和臺風(fēng)相互作用導(dǎo)致的天氣尺度環(huán)境引導(dǎo)氣流分量的引導(dǎo),主要和beta渦旋對旋轉(zhuǎn)、與季風(fēng)渦旋的合并、以及加強(qiáng)的Rossby波能量頻散這3個(gè)重要過程有關(guān)。臺風(fēng)"煙花"在緯向尺度約3 000 km的季節(jié)內(nèi)尺度季風(fēng)渦旋北部的偏東氣流西移過程中,與季風(fēng)渦旋相互作用導(dǎo)致beta渦旋對氣旋性旋轉(zhuǎn),通風(fēng)流經(jīng)歷東南風(fēng)—東北風(fēng)—西南風(fēng)的轉(zhuǎn)變,使得"煙花"向西減速并逐漸向季風(fēng)渦旋中心移動,并于7月22日00時(shí)與季風(fēng)渦旋合并,加強(qiáng)了Rossby波能量頻散,使得"煙花"東南邊緣的天氣尺度西南風(fēng)加強(qiáng),為緩慢移動的"煙花"提供了向北的引導(dǎo),"煙花"突然向北轉(zhuǎn)向。

Abstract:

Typhoon "In-fa" (2106) experienced a sudden northward turn toward the Taiwan Island at 0000 UTC on July 22, 2021, which was not predicted in all operational forecasts. By using FNL wind field data and the Lanczos filtering method, this paper found that the westward deceleration of Typhoon "In-fa" before the deflection was mainly affected by the intraseasonal component of environmental steering flows associated with the monsoon gyre, while the sudden northward turn and the subsequent northward acceleration were mainly attributed to the synoptic-scale component of environmental steering flows associated with the interaction between the monsoon gyre and the typhoon. These changes in multi-timescale steering flows were primarily caused by three important processes: the rotation of beta gyres, the coalescence process and the enhanced Rossby wave energy dispersion. Typhoon "In-fa" initially moved westward in the easterlies in the northern periphery of a monsoon gyre on the intraseasonal timescale with a zonal scale of about 3 000 km. The interaction between the typhoon and the monsoon gyre led to the cyclonic rotation of beta gyres. Thus, the ventilation flows between beta gyres correspondingly converted from the southeasterlies to the northeasterlies to the southwesterlies, which made the westward "In-fa" slow down and gradually move into the interior of the monsoon gyre. Eventually, "In-fa" coalesced with the monsoon gyre at 0000 UTC on July 22. The synoptic-scale southwesterlies in the southeastern periphery of "In-fa" were strengthened due to the enhanced Rossby wave energy dispersion caused by this coalescence process, which provided northward guidance for the slow-moving "In-fa". Therefore, Typhoon "In-fa" turned abruptly northward.

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梁佳,黎詩瑜.季風(fēng)渦旋對臺風(fēng)"煙花"路徑突變的影響.氣象科學(xué),2024,44(3):527-535 LIANG Jia, LI Shiyu. Effects of monsoon gyre on sudden track changes of Typhoon "In-fa". Journal of the Meteorological Sciences,2024,44(3):527-535

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收稿日期:2022-07-05
最后修改日期:2022-12-06
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在線發(fā)布日期: 2024-07-16
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