臺風“利奇馬”登陸前后雨帶強度與結構變化特征分析

doi:10.3969/2019jms.0074

首頁 > 過刊瀏覽>2020年第40卷第3期 >325-332. DOI:10.3969/2019jms.0074

臺風“利奇馬”登陸前后雨帶強度與結構變化特征分析
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                        10.3969/2019jms.0074
                    
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中圖分類號:P458.2
基金項目:浙江省氣象科技計劃項目（2019YB18）；臺州市科技計劃項目（1901gy17）

Analysis on the variation characteristics of rainbelt intensity and structure of Typhoon “Lekima” before and after its landing

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利用GPM衛(wèi)星3-IMERGM產品、NCEP/NCAR逐6 h水平分辨率0.25°×0.25°的再分析資料和后向追蹤軌跡模擬技術，對“利奇馬”登陸前后降水結構特征及雨帶強度變化成因展開分析。研究發(fā)現(xiàn)：登陸前強雨帶非對稱分布與垂直風切變作用密切相關；臨近登陸風切減弱，強雨區(qū)趨向環(huán)流向岸側。軸對稱環(huán)狀降水率先后出現(xiàn)收縮和擴展，雨帶強度經(jīng)歷兩增兩減變化。其中登陸前雨帶增強發(fā)生在南亞高壓和副熱帶高壓加強、垂直風切持續(xù)減弱的有利環(huán)境背景下；浙閩沿海離岸風和中心西側次級環(huán)流形成促進了對流雨帶發(fā)展；“羅莎”臺風外圍北側偏東氣流為雨帶提供有利水汽輸送。登陸時刻雨強減弱發(fā)生在南壓高壓、副熱帶高壓及“羅莎”北側偏東風減弱背景下。雨強變化與水汽通量散度呈正相關，與垂直風切變呈反相關，整層可降水量增大相對降水率峰值有6 h左右提前量。

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Based on the 3-IMERGM data of GPM and NCEP 0.25°×0.25° reanalysis data and backward airflow trajectory simulation technology, the analysis on the asymmetric and axisymmetric structure characteristics of precipitation and the cause of rainband's rapid intensification of Typhoon “Lekima” are carried out. The results show that the vertical wind shear intensity is moderate before landing, which plays a dominant role in the asymmetric distribution of rainbands. The shear intensity decreases when TC near landing, and the precipitation rate tends to develop onshore. The intensity of rainband experiences two processes of increase and decrease, and the distribution of annular mean precipitation experiences the change of getting contracted and going expanded. The strengthening and easterly moving of the South Asia high enhance the divergence of the upper level, while the strengthening and westerly moving of the West Pacific subtropical high enhance the development of the southeastern jet at the lower level. The intensification of offshore wind near the ground and the formation of secondary circulation enhance the convergence of the lower level on the west side of the TC. The water vapor from the Southern Sea before landing are weakened. The eastward flow on the north side of Typhoon “Krosa” provides water vapor supplement. The convergence intensity of water vapor in the lower layer changes synchronously with the rainfall intensity. The change of PWAT develops 6 hours ahead of the peak of rain rate.

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翁之梅,賁海榮,高麗,王凱.臺風“利奇馬”登陸前后雨帶強度與結構變化特征分析.氣象科學,2020,40(3):325-332 WENG Zhimei, BEN Hairong, GAO Li, WANG Kai. Analysis on the variation characteristics of rainbelt intensity and structure of Typhoon “Lekima” before and after its landing. Journal of the Meteorological Sciences,2020,40(3):325-332

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收稿日期:2019-09-20
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在線發(fā)布日期: 2020-07-08
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