###
DOI:
本文二维码信息
天山峡谷穿谷急流触发强下坡风暴的中尺度特征分析
汤浩1, 陆汉城2, 储长江3, 孙鸣婧1, 琚陈相4
(1.新疆维吾尔自治区气象台;2.国防科技大学气象海洋学院;3.新疆维吾尔自治区气象局;4.中国气象局乌鲁木齐沙漠气象研究所)
Mesoscale Analysis of Severe Downslope Windstorm Caused by Gap Jet in Tianshan Canyon
tanghao1, LU Hancheng2, CHU Changjiang3, SUN Mingjing1, JU Chenxiang4
(1.xinjiang meteorological observatory;2.. College of Meteorology and Oceanography,Defense University of Science and Technology;3.xinjiang meteorological bureau;4.Institute of Desert Meteorology,China Meteorological Administration)
摘要
相似文献
本文已被:浏览 173次   下载 41
投稿时间:2019-10-13    修订日期:2020-06-01
中文摘要: 天山峡谷穿谷急流与峡谷内非对称地形交互作用触发的下坡风暴,造成2007年2月28日新疆吐鲁番盆地境内旅客列车侧翻的重大天气灾害。为了解这次极端大风过程中大尺度环流背景、中尺度系统和复杂地形相互作用触发下坡风暴的机理,使用WRF模式进行了数值模拟和中尺度诊断分析,结果表明:在天山两侧强气压梯度作用下,气流爬坡进入天山峡谷后因狭管效应形成穿谷急流,与此同时气流爬坡进入天山峡谷过程中受地形强迫形成重力波,并在背风坡的断崖式突降地形区产生背风波,将穿谷急流的能量向地面传输,最终形成背风坡下坡风暴。在此过程中重力波波破碎形成的湍流活跃层和中低空风向切变的临界层吸收上层波能量向下传输加强了穿谷急流的能量,大气稳定层结则加剧了将能量向地面输送的下沉运动。
Abstract:Severe downslope windstorm triggered by the interaction between the gap jet and the asymmetrical topography in the Tianshan canyon which caused severe disasters of trains rolloverin the Turpan Depression in Xinjiang on February 28, 2007. To understand the mechanism of downslopewindstorm between the interaction of large-scale circulation background,mesoscale system and complex topography in this extreme windstorm.We use a WRF model to simulated it.Base on the mesoscale diagnostic analysis to simulative results,We propose a mechanism for the windstorm : Under the pressure gradient between north-south sides of the Tianshan Mountain, the air parcel climbs windward slope and flows into the Tianshan Gorge and then forms gap jet due to effect of narrow,the jet generated gravity waves forced by the asymmetric terrain of the Tianshan Canyon, and produces a lee waves in the leeward, which transmits the energy of the gap jet to the ground,andSevere downslope windstorm formed finally. In this process, the turbulence formed by the wave breaking and the critical layer absorb the upper layer energy downward, which strengthens the energy of the gap jet,and the atmospheric stability stratification exacerbates the sinking movement, which sinks energy to the ground.
文章编号:201910130371     中图分类号:    文献标志码:
基金项目:新疆气象局重点项目(ZD201903) 中国气象局气象预报业务关键技术发展专项YBGJXM(201905)
引用文本:
汤浩,陆汉城,储长江,孙鸣婧,琚陈相,0.[en_title][J].Meteor Mon,():-.
tanghao,LU Hancheng,CHU Changjiang,SUN Mingjing,JU Chenxiang,0.Mesoscale Analysis of Severe Downslope Windstorm Caused by Gap Jet in Tianshan Canyon[J].Meteor Mon,():-.