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南支槽影响下西藏高原南部3次暴雪天气特征分析
(1.西藏自治区气象台 拉萨;2.西藏阿里地区气象台 狮泉河)
Analysis of 3 Times Snowstorm in Southern Tibetan Plateau Affected by Southern Branch Trough
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投稿时间:2017-03-23    修订日期:2019-04-01
中文摘要: 利用NCEP/NCAR再分析资料和常规观测资料, 对2013年1-2月西藏高原南部3次暴雪天气的环流形势、动力、水汽条件等进行诊断对比分析。结果表明:3次暴雪天气中高纬度均以经向型环流形势为主,从长波槽脊配置可分为长波槽型和横槽型两大类;西太平洋副热带高压偏西偏强、伊朗高压东北发展对南支槽加深和缓慢东移起到关键作用。南支槽区560 dagpm线在30°N以南,并东移至70°E附近或以东时西藏高原南部开始出现暴雪天气;暴雪区附近涡度场变化反应了南支槽强度特征,中高层强辐散对南支槽发展起到重要作用;水汽主要源于阿拉伯海,孟加拉湾水汽对东部降雪起到补充作用,南支槽前高空西南急流对水汽输送起关键作用,同时喜马拉雅山脉的大地形抬升,有利于上升运动和水汽凝结成云;水汽通量、水汽通量散度等变化及中心的移动方向,对降雪的强度、落区和时段具有较好的预报指示意义。
Abstract:The NCEP/NCAR reanalysis data and conventional observation data are used. Analysis of the circulation situation dynamic and thermodynamic conditions of the 3 times snowstorm in southwest of the Tibetan plateau in the 2013. The results show that the middle and high latitudes are radial circulation situation and according to the trough position of the trough, it can be divided into the long wave trough and horizontal trough. The Western Pacific subtropical high in West and Iran high northeast of the slow development of the southern trough deepened and eastward to play a key role. .Southern Branch trough area 560 dagpm line at 30 deg.n South and eastward to 70 deg.e near or to the east at the southern part of the Tibet Plateau began to appear snowstorm. Snowstorm area in the vicinity of the vorticity field changes reflect the strength characteristics of the South Branch trough and divergence field vertical evolution and senior strong divergence scattered and plays an important role in the South Branch trough development and snowstorm strengthen the peninsular. Water vapor mainly comes from the Arabia sea, and the water vapor in the bay of Bengal plays a complementary role in the eastern snowfall. The southwest upper level jet to water vapor transport to plays a key role. at the same time the Himalaya mountains terrain uplift is conducive to the ascending motion and water vapor condensation. Water vapor flux and vapor flux divergence value change and center moving to snowfall intensity, falling range and time has a better forecasting significance.
文章编号:201703230172     中图分类号:    文献标志码:
基金项目:中国气象局预报员专项(CMAYBY2014-067)、公益性行业(气象)科研专项(GYHY201406015)和气象关键技术集成与应用项目(CMAGJ2015M58)共同资助.
引用文本:
罗布坚参,假拉,德庆,白珍,次旦巴桑,0.[en_title][J].Meteor Mon,():-.
luobujiancan,jiala,deqing,baizhen,cidanbasang,0.Analysis of 3 Times Snowstorm in Southern Tibetan Plateau Affected by Southern Branch Trough[J].Meteor Mon,():-.