气象科学2017，Vol.37Issue(5)：639-651,13.DOI:10.3969/2017jms.0006
大别山地形对江淮飑线发展变化及组织结构的影响研究
Study of the orographic effects of the Dabie mountain on the development and structure of squall line
摘要
Abstract
By using the WRF model,NCEP/NCAR reanalysis data and conventional meteorological observation data,a squall line process occurred in Jianghuai region during 11-12 July,2014 was conducted numerical simulation,topographical sensitivity experiments and comparison analysis.Moreover,the variation characteristics of inner organizational structure of the squall line and the orographic effect on the squall line when went through the Dabie Mountain were also studied.Results show that:(1) the reasons why the squall line strengthened in front of the mountain and while weakened rapidly at the leeward side are the instable windward convection and the much stronger upward movement.(2)The eastern edge of Dabie Mountain had a greater contribution to the strengthening of the squall line.When the squall line moved to the Dabie Mountain in the afternoon,the valley wind circulation strengthened at the eastern edge and it forced the convective cell generate in the front of the squall line.The experiment shows that the valley wind can enhance the low-level wind velocity up to 6 m· s-1.There existed no new cell without the valley wind.(3) Sensitivity experiments implied that the lee wave turbulence at the east side of Dabie Mountain caused by the terrain is conducive to convective development and the strengthening of squall line.Furthermore,the supplement of abundant moisture is one of the factors to the strengthening of the squall line when it went down the mountain.关键词
大别山/对流单体/谷风环流/背风波Key words
Dabie mountain/Convective cell/Valley wind circulation/Lee wave分类
天文与地球科学引用本文复制引用
王瑾婷,丁治英,赵向军,刘瑾..大别山地形对江淮飑线发展变化及组织结构的影响研究[J].气象科学,2017,37(5):639-651,13.基金项目
国家重点基础研究发展项目计划(973计划)项目(2013CB430103) （973计划）
国家自然科学基金重点项目资助项目(41530427) （41530427）
国家自然科学基金资助项目(41375058) （41375058）
中国气象科学研究院灾害天气国家重点实验室开放课题(2015LASW-A07) （2015LASW-A07）
