江蘇"4·30"強(qiáng)風(fēng)雹成因及雙偏振雷達(dá)特征分析

doi:10.12306/2022jms.0049

首頁(yè) > 過(guò)刊瀏覽>2022年第42卷第5期 >638-649. DOI:10.12306/2022jms.0049

江蘇"4·30"強(qiáng)風(fēng)雹成因及雙偏振雷達(dá)特征分析
DOI:
                        10.12306/2022jms.0049
                    
CSTR:
                        
                    
作者:
                        
                        
                    
作者單位:
作者簡(jiǎn)介:
通訊作者:
中圖分類號(hào):P458
基金項(xiàng)目:江蘇省青年科技人才托舉工程;江蘇省自然科學(xué)基金(BK20201506);北極閣開(kāi)放研究基金(BJG202103;BJG202208)

Analysis on causes of '4.30’ severe gales and hails event and associated characteristics of dual-polarization radar echoes over Jiangsu

Author:

Affiliation:

Fund Project:

摘要

圖/表

訪問(wèn)統(tǒng)計(jì)

參考文獻(xiàn)

相似文獻(xiàn)

引證文獻(xiàn)

資源附件

文章評(píng)論

摘要:

利用高分辨率再分析資料、雙偏振雷達(dá)觀測(cè)數(shù)據(jù)，揭示了江蘇“4·30”強(qiáng)風(fēng)雹成因及其雷達(dá)特征。結(jié)果表明，此過(guò)程發(fā)生在高空異常深厚的東北冷渦背景下，中層西北急流和地面暖低壓均顯著偏強(qiáng)，造成遠(yuǎn)超過(guò)經(jīng)驗(yàn)性指標(biāo)值的垂直風(fēng)切變，利于風(fēng)暴的增強(qiáng)及組織化發(fā)展。對(duì)流風(fēng)暴的影響可分為30日午后到傍晚局地對(duì)流單體和傍晚到上半夜颮線兩個(gè)不同階段：第一階段局地對(duì)流性強(qiáng)，能量積聚大，沿淮和淮北西部地區(qū)多局地性雷暴大風(fēng)，并散發(fā)不同尺寸的冰雹；第二階段在地面強(qiáng)冷空氣大風(fēng)及中高層干冷空氣動(dòng)量下傳的影響下，颮線系統(tǒng)及其前緣陣風(fēng)鋒移動(dòng)快速。颮線上弓形回波前端的強(qiáng)下沉輻散出流，疊加環(huán)境風(fēng)的影響，導(dǎo)致江蘇東南部地區(qū)區(qū)域性的極端災(zāi)害大風(fēng)天氣。雷達(dá)回波既可清晰顯示冰雹云的一般回波特點(diǎn)，如反射率因子回波強(qiáng)，粒子均一性差等；也可反映不同尺寸冰雹回波的差異性，如回波強(qiáng)度越強(qiáng)，最大反射率因子高度越高，單體回波傾斜、弱回波區(qū)特征結(jié)構(gòu)越清晰，三體散射特征越明顯的風(fēng)暴單體產(chǎn)生的冰雹尺寸越大；在沒(méi)有大水滴包裹時(shí)，CC值隨冰雹尺寸的增大而減小，且CC小值伸展高度增高等。綜合分析雷達(dá)回波多個(gè)參量，如風(fēng)暴單體和陣風(fēng)鋒的移速、風(fēng)暴單體特征高度的下降速度、Z_DR大值高度降低等指標(biāo)，對(duì)對(duì)流災(zāi)害性大風(fēng)量級(jí)的監(jiān)測(cè)與預(yù)警有重要指示意義。

Abstract:

The causes of ‘4. 30’ severe gales and hails event in Jiangsu and the associated characteristics of radar echoes were analyzed based on high-resolution reanalysis data and dual- polarization radar observation. The results showed that the vertical wind shear far exceeds the empirical index under the atmospheric background of anomalously deep northeast cold vortex at relatively high altitude, extremely intensified northwest jet at mid-level and surface warm low pressure, and the vertical wind shear induces an enhancement and organized development of the convective storms. The evolution process of the convection is composed by two different stages:The first stage was the formation of local convective cells from the afternoon to the evening on the 30th, and the second stage is the occurrence of squalls from the evening to midnight. In the first stage, thunderstorm gales and hails with different sizes which are produced by the local convection with abundant energy accumulation occur along the Huaihe River and over the western region north to the Huaihe River. In the second stage, the strong winds associated with cold air and the downward transport of momentum from the cold-and-dry air at the mid- higher levels both induce the fast-moving of the storm cells and the gust front. The regional extreme gales over the southeast Jiangsu can be attributed to the joint effort of the ambient winds and the intensely divergent outflow associated with the downdraft in the front of the bow-shaped cells on the squall line system. Such hail cloud echoes as intensified base reflectivity and poor homogeneity of particles are well displayed in the dual-polarization radar observation. The diversities of the echoes of hails with different sizes can also be denoted. For example, the stronger the echoes, the higher heights of maximum reflectivity factor, and the distinct structures of the tilt echo, the weak echo area and the three-body scatter spike all indicate the possibility of the hails with larger sizes. In the absence of large water droplet coating, the CC value almost decreases with the increase of hail size. Comprehensive analysis on the multiple dual-polarization radar indicators such as the moving speed of the storm cell and the associated gust front, the falling speed of the characteristic heights of the cell and maximum Z_DR will have important indications for the short-impending monitoring and warning of the convective disastrous gales.

參考文獻(xiàn)

相似文獻(xiàn)

引證文獻(xiàn)

引用本文

陳圣劼,劉梅,楊夢(mèng)兮,吳海英,李萬(wàn)莉,莊瀟然.江蘇"4·30"強(qiáng)風(fēng)雹成因及雙偏振雷達(dá)特征分析.氣象科學(xué),2022,42(5):638-649 CHEN Shengjie, LIU Mei, YANG Mengxi, WU Haiying, LI Wanli, ZHUANG Xiaoran. Analysis on causes of '4.30’ severe gales and hails event and associated characteristics of dual-polarization radar echoes over Jiangsu. Journal of the Meteorological Sciences,2022,42(5):638-649

復(fù)制

文章指標(biāo)

點(diǎn)擊次數(shù):
下載次數(shù):
HTML閱讀次數(shù):
引用次數(shù):

歷史

收稿日期:2022-01-28
最后修改日期:2022-06-21
錄用日期:
在線發(fā)布日期: 2022-11-03
出版日期:

文章二維碼

您是第位訪問(wèn)者
氣象科學(xué) ® 2026 版權(quán)所有
技術(shù)支持：北京勤云科技發(fā)展有限公司

抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说

引用本文

分享

相關(guān)視頻

文章指標(biāo)

歷史

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒 激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说

引用本文

分享

相關(guān)視頻

文章指標(biāo)

歷史

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说