金沙江下游穿谷大風天氣的雷達回波特征分析

doi:10.12306/2023jms.0055

首頁 > 過刊瀏覽>2025年第45卷第4期 >572-583. DOI:10.12306/2023jms.0055

金沙江下游穿谷大風天氣的雷達回波特征分析
DOI:
                        10.12306/2023jms.0055
                    
CSTR:
                        
                    
作者:
                        
                        
                    
作者單位:
作者簡介:
通訊作者:
中圖分類號:P412.25
基金項目:國家自然科學基金資助項目(U2242202;U2040212)；中國氣象局創(chuàng)新發(fā)展專項(CXFZ2022J012)；復雜地形下云南航空安全氣象關鍵技術研究及示范(202203A100006)

Analysis of radar echo characteristics of canyon gale events in the downstream of the Jinsha River

Author:

Affiliation:

Fund Project:

摘要

圖/表

訪問統(tǒng)計

參考文獻

相似文獻

引證文獻

資源附件

文章評論

摘要:

為了揭示金沙江下游穿谷大風下天氣雷達回波特征及監(jiān)測能力，本文利用2018年1月—2022年4月的ERA5再分析資料、天氣雷達數(shù)據(jù)、探空站和地面氣象觀測資料，選擇穿谷大風個例，分析金沙江下游典型河谷區(qū)不同季節(jié)穿谷大風天氣的環(huán)流形勢和雷達回波演變特征。結果表明：(1)干季(11月—次年4月)和雨季(5—10月)大風的尺度類型、影響系統(tǒng)、云系結構和雷達回波特征差異明顯。雨季大風是受西南渦影響的中小尺度對流性大風天氣，云系變化特征表現(xiàn)為塊狀積云快速演變，回波強度超過55 dBZ，在徑向速度場中呈中小尺度輻合線的特征。干季大風是500 hPa的偏西風繞流青藏高原分成南北兩支氣流，層狀云回波維持，強度在30 dBZ左右，在速度圖上伴隨速度模糊區(qū)、“牛眼”結構和零速度線彎折的鋒面切變特征。(2)風廓線產(chǎn)品(Vertical Wind Profile，VWP)反映穿谷大風中對流層的冷暖平流變化?；夭敻?Echo Top，ET)和垂直液態(tài)水含量(Vertically Integrated Liquid，VIL)揭示了雨季大風的位置。VIL值增高至最大值后快速減小與大風時間吻合。

Abstract:

In order to investigate the radar echo features and monitoring capabilities of valley-crossing gale events in the lower reaches of the Jinsha River， this study utilized ERA5 reanalysis data， weather radar data，sounding station data and surface meteorological observations from January 2018 to April 2022. By selecting representative cases of valley-crossing gale events， the study analyzed the circulation patterns and evolution of radar echoes during different seasons in the typical river valley area downstream of the Jinsha River. Results show the following two points. Firstly，this study compared the differences in two valley-crossing gale events characteristics between the dry and rainy seasons， including scale types， impact systems， cloud structure， and radial radar echo velocity. The wind during the rainy season (May-October) is a mesoscale convective weather event influenced by the southwestern vortex. The cloud features are characterized by rapidly evolving block-shaped convective echoes， with strong echo cores exceeding 55 dBZ. The velocity field exhibits the characteristics of small and medium-scale convergence lines. The wind during the dry season (November-April) is a large-scale weather event formed by the northward expansion of the 500 hPa westerly jet stream around the Qinghai-Tibet Plateau and through the gorge. The cloud development is low and flat， with layered cloud echoes maintaining an intensity of around 30 dBZ. The radial velocity characteristics include velocity ambiguity areas， “bull's eye” structures， and bent zero velocity lines. Secondly， The Vertical Wind Profile (VWP) can reflect the changes in temperature advection in the troposphere during valley-crossing gale events. Meanwhile， the height of Echo Top (ET) and the Vertically Integrated Liquid (VIL) reflect the location of rainy season gale events. The VIL value increases to its maximum and then rapidly decreases， which coincides with the time of the gale events.

參考文獻

相似文獻

引證文獻

引用本文

張昊楠,尹曄,白愛娟,程志剛,黃迪威.金沙江下游穿谷大風天氣的雷達回波特征分析.氣象科學,2025,45(4):572-583 ZHANG Haonan, YIN Ye, BAI Aijuan, CHENG Zhigang, HUANG Diwei. Analysis of radar echo characteristics of canyon gale events in the downstream of the Jinsha River. Journal of the Meteorological Sciences,2025,45(4):572-583

復制

文章指標

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

歷史

收稿日期:2023-05-10
最后修改日期:2023-07-10
錄用日期:
在線發(fā)布日期: 2025-11-29
出版日期:

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

相關視頻

文章指標

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

相關視頻

文章指標

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