2019年超強臺風“利奇馬”引發(fā)浙江特大暴雨過程分析

doi:10.3969/2019jms.0057

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2019年超強臺風“利奇馬”引發(fā)浙江特大暴雨過程分析
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                        10.3969/2019jms.0057
                    
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中圖分類號:P458.1
基金項目:國家自然科學基金資助項目（41875078；41861144014）；臺州市科技計劃項目（1902gy03）；臺州市氣象局科技計劃項目（TZ2019Y）

Analysis of rainstorm caused by super typhoon “Lekima” in Zhejiang Province of 2019

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利用NCEP FNL 0.25°×0.25°的再分析資料和浙江省中尺度氣象站降水資料，從產(chǎn)生強降水的條件來對"利奇馬"特大暴雨過程進行診斷分析。結果表明：（1）強降水主要集中在近臺風中心的西南部分及其稍遠的北部，其中近臺風中心為眼壁降水，北部為螺旋云帶降水；（2）850~925 hPa水汽通量輻合中心與暴雨落區(qū)一致，水汽輻合強度差異是造成臺風眼壁強降水落區(qū)差異的關鍵；（3）臺風強度大時近中心上升運動強烈，正垂直螺旋度中心值的減小和中心下降對應強降水的發(fā)生，低層正螺旋度和高層負螺旋度中心的重疊區(qū)對對流性降水落區(qū)有一定的指示；（4）本次過程地形增益最明顯地區(qū)在臺州北部，在水汽條件處于劣勢情況下出現(xiàn)降水副中心。

Abstract:

The reanalysis data of NCEP FNL 0.25°×0.25° and the precipitation data of Zhejiang mesoscale meteorological stations are used for the diagnostic analysis on "Lekima" rainstorm. The results are as follows:(1) Heavy rainfall is mainly in the southwest part of the near typhoon center and the north part, which is slightly far from it, with the eye wall precipitation near the typhoon center and the spiral cloud belt precipitation in the north part. (2) The large-value area of the 850 hPa to 925 hPa water vapor flux convergence is consistent with the actual heavy rainfall area, and the difference in intensity of water vapor convergence is the key to the difference in the areas of the heavy typhoon eye wall precipitation. (3) The uplifting movement of the system near the typhoon center is strong while the typhoon is strong, the decrease of the central value of the positive helicity and the decrease of the center correspond to the occurrence of heavy precipitation, and the overlap between the low-level positive vertical helicity and the high-level negative vertical helicity center has certain indications to the convective precipitation. (4)The region with the most obvious topographic gain in this process is in the northern part of Taizhou, and the precipitation sub-centers appears even when the water vapor conditions are at a disadvantage.

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劉曉汝,謝作威.2019年超強臺風“利奇馬”引發(fā)浙江特大暴雨過程分析.氣象科學,2020,40(1):89-96 LIU Xiaoru, XIE Zuowei. Analysis of rainstorm caused by super typhoon “Lekima” in Zhejiang Province of 2019. Journal of the Meteorological Sciences,2020,40(1):89-96

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收稿日期:2019-09-16
最后修改日期:2019-10-20
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在線發(fā)布日期: 2020-03-16
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