一次暴雨過程的鋒生特征及風(fēng)場演變分析

doi:10.12306/2023jms.0048

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一次暴雨過程的鋒生特征及風(fēng)場演變分析
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                        10.12306/2023jms.0048
                    
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中圖分類號:P458.121.1
基金項(xiàng)目:江蘇省氣象局重點(diǎn)資助項(xiàng)目(KZ202107)

Analysis of frontogenesis characteristics and the winds field evolution of a rainstorm process

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本文利用ECMWF ERA-INTERIM(0.25°×0.25°)再分析資料和FY-2H衛(wèi)星云頂亮溫資料,通過計(jì)算鋒生函數(shù)、非地轉(zhuǎn)風(fēng)、水平風(fēng)切變強(qiáng)度的分布與暴雨的關(guān)系,對2020年7月5—7日江蘇一次暴雨過程的成因進(jìn)行了診斷分析。結(jié)果表明,強(qiáng)降水區(qū)中低層鋒生、中高層鋒消。850 hPa鋒生變化能反映出對暴雨的影響,散度項(xiàng)、變形項(xiàng)對鋒生為正貢獻(xiàn),變形項(xiàng)、傾斜項(xiàng)與總鋒生變化趨勢基本一致,散度鋒生始終伴隨整個(gè)降水過程,暴雨最強(qiáng)階段是由傾斜鋒生疊加在水平鋒生上作用的結(jié)果。鋒生加強(qiáng)了風(fēng)場的非地轉(zhuǎn)性,并強(qiáng)迫出鋒面次級環(huán)流,非地轉(zhuǎn)風(fēng)的散度形成次級環(huán)流上升支。對流層低層,鋒生強(qiáng)度隨急流發(fā)展同步增強(qiáng)。200 hPa高空急流經(jīng)向v場變化與暴雨強(qiáng)度演變趨勢正相關(guān):暴雨開始階段,v場增大,降水增強(qiáng);當(dāng)高空急流v場最大時(shí),暴雨最強(qiáng);暴雨減弱結(jié)束階段,高、低空v場減小,北風(fēng)增大,高空西南風(fēng)急流右后方次地轉(zhuǎn)現(xiàn)象消失,轉(zhuǎn)為超地轉(zhuǎn)西南風(fēng)。

Abstract:

By using ECMWF ERA-INTERIM(0.25°×0.25°)reanalysis data and FY-2H TBB data,through calculating the relationship between frontogenesis function, non-geostrophic wind, horizontal wind shear intensity distribution and rainstorm, the cause of a rainstorm process in Jiangsu on July 5-7, 2020 was diagnosically analyzed. Results indicate that in areas of heavy precipitation, frontogenesis occurs in the middle and lower layers, and frontogenesis disappears in the middle and upper layers. The 850 hPa frontogenesis change can better reflect the impact on rainstorm. Divergence term and deformation term are positive contributions to frontogenesis. The deformation term and tilt term are basically consistent with the change trend of total frontogenesis. Divergence frontogenesis is always accompanied by the whole precipitation process. The strongest stage of rainstorm is the result of superposition of tilt frontogenesis on horizontal frontogenesis. Frontogenesis strengthens the non-geostrophic nature of the wind field and forces secondary circulation on the front, with the divergence of non-geostrophic winds forming an ascending branch of the secondary circulation. In the lower troposphere, the intensity of frontogenesis increases synchronously with the development of the jet stream. The meridional v field change of 200 hPa upper air jet is positively correlated with the evolution trend of rainstorm intensity: at the beginning of rainstorm, v field increases and precipitation increases; when the upper jet v field is the largest, the rainstorm is the strongest; at the end of rainstorm weakening, the high and low level v fields decrease, the north wind increases, and the secondary geostrophic phenomenon in the right rear of the upper level southwest jet disappears, turning into the super geostrophic southwest wind.

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趙凱,張銀意,陳小宇,陳圣劼,王磊.一次暴雨過程的鋒生特征及風(fēng)場演變分析.氣象科學(xué),2024,44(5):881-889 ZHAO Kai, ZHANG Yinyi, CHEN Xiaoyu, CHEN Shengjie, WANG Lei. Analysis of frontogenesis characteristics and the winds field evolution of a rainstorm process. Journal of the Meteorological Sciences,2024,44(5):881-889

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收稿日期:2023-04-18
最后修改日期:2023-06-15
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在線發(fā)布日期: 2024-11-21
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