李圆圆,肖开提·多莱特,杨莲梅,张云惠.一次中亚低涡造成的新疆暴雪天气过程分析.气象科学,,(): LI Yuanyuan,XiaoKaiti·Duolaite,YANG Lianmei,ZHANG Yunhui.Analysis on a heavy snow by central Asian vortex in Xinjiang.Journal of the Meteorological Sciences,,():
一次中亚低涡造成的新疆暴雪天气过程分析
Analysis on a heavy snow by central Asian vortex in Xinjiang
投稿时间:2012-10-22  修订日期:2013-08-05
DOI:10.3969/2013jms.0085
中文关键词:  暴雪  中亚低涡  急流特征  物理量诊断
英文关键词:Heavy snow  Central Asian vortex  Jet characteristics  Physical quantity diagnosis
基金项目:公益性行业(气象)科研专项(GYHY201106007);国家自然基金资助项目(41075049)
作者单位E-mail
李圆圆 南京大学 大气科学学院, 南京 210093
新疆维吾尔族自治区气象台, 乌鲁木齐 830002 
lyyhaitun@hotmail.com 
肖开提·多莱特 新疆维吾尔族自治区气象局, 乌鲁木齐 830002  
杨莲梅 乌鲁木齐沙漠气象研究所, 乌鲁木齐 830002  
张云惠 新疆维吾尔族自治区气象台, 乌鲁木齐 830002  
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中文摘要:
      利用实况观测资料、EC/T639数值模式预报资料和NCEP1°×1°再分析资料,对2012年2月一次由中亚低涡造成的冬季新疆西部地区典型暴雪天气过程的环流特征和物理量场进行了综合分析。结果表明:此次暴雪天气过程属欧洲脊发展、中亚低涡东移造成的新疆西部及天山北坡的降雪过程。200 hPa西南急流使高层辐散,起到“抽气机”作用;500 hPa偏南气流与700 hPa东风急流为暴雪提供了水汽和热量的输送,同时加强了抬升运动;高层辐散、低层辐合以及较强的上升运动是暴雪发生的动力条件,降雪强度最大时段对应上升运动的强盛发展阶段;水汽的垂直输送导致局地比湿显著增大,深厚的湿层和强烈的水汽辐合为暴雪提供了充沛的水汽条件;云图上“干侵入”出现的时间与位置可以大致判断强降雪出现的时间和位置。
英文摘要:
      Based on the observational data, EC/T639 numerical prediction data and NCEP1° ×1 ° reanalysis data at 6 h-interval, the circulation characteristics and physical quantity fields of the heavy snow caused by central Asian vortex in western Xinjiang on February are discussed comprehensively. The results show that the development of the Europe ridge and central Asian vortexs movement towards xinjiang raised the heavy snow in western Xinjiang and the north slope of Tianshan Mountain.The southwestly jet at 200 hPa works as an air pump, making upper-level divergence; the southly airflow at 500 hPa and southeastly jet at 700 hPa provided enough water vapor and heat for the heavy snow, meanwhile, strengthened the ascending motion it needs. Upper-level divergence,low-level convergence and strong ascending motion were dynamic conditions for the heavy snow; the period while the heaviest snow happened was the tine slot while the ascending motion was the strongest. The vertical transportation of water vapor caused the increase of the local specific humidity, and the deep wet layer and the strong water vapor convergence provided abundant moisture for the heavy snow. The time and position of the dry intrusion in satellite cloud pictures can be used as an indicator in forecasting the heavy snow.
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