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doi:  10.12013/qxyjzyj2017-031
龙岩地区一次夏季暴雨天气过程的地形影响模拟试验

Numerical simulation test of the effect of terrain on “2015.7.22” extremely heavy rain in Longyan
摘要点击 239  全文点击 192  投稿时间:2017-01-21  修订日期:2017-06-10
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基金:  福建省气象局基层科技专项(编号:2016J01)
中文关键词:  暴雨,地形作用,垂直运动、水平散度,水汽输送,模拟试验
英文关键词:  topographic effect  heavy rainfall  sensitivity experiment
        
作者中文名作者英文名单位
倪悦NI Yue龙岩市气象台
廖义樟LIAO Yizhang龙岩市气象台
苏源SU Yuan龙岩市气象台
引用:倪悦,廖义樟,苏源.2017,龙岩地区一次夏季暴雨天气过程的地形影响模拟试验[J].气象与减灾研究,40(3):200-207
中文摘要:
      利用中尺度WRF数值模式对2015年7月22日龙岩地区大暴雨过程进行数值试验,从地形对大气垂直运动、高低层水平散度以及水汽条件的影响三方面进行控制性试验与敏感性试验对比,研究了龙岩地区特殊地形对此次大暴雨的影响。结果表明,此次过程的降水分布对龙岩地区地形十分敏感,特殊地形作用能使当地降水产生明显增幅。高地形通过阻挡和摩擦作用使大气在近地面层形成堆积,为中低层大气的垂直上升运动积累能量,这种地形影响可以通过中小尺度的扰动上传到对流层顶高度;地形的作用还有利于中低层大气水平辐合、高层水平辐散作用的加强,并以波列的形式影响周围大气,这种地形对大气水平散度的影响对降水变化具有很好的指示意义;受地形影响,水汽在迎风坡有明显的累积,随着降水系统的移动在高地形区产生强降水。
Abstract:
      The possible effect of the city’s particular terrain on the heavy rainfall occurred in Longyan City is investigated by using the meso-scale model WRF through three aspects comparison of the terrain on the atmospheric vertical motion, high and low level divergence and the water vapor condition between the control experiment and the sensitivity test. Results show that precipitation distribution is sensitive to the Longyan’s terrain,which generate an obvious increase to the rainfall. Terrain makes the air to be a stack layer in surface layer by blocking and friction, which accumulated energy for enhancement of vertical ascending motion in the lower and middle troposphere. Effect of terrain propagated upward to the tropopause by small scale disturbances. Terrain will help strengthening the local horizontal convergence in low—middle atmosphere and horizontal divergence in upper atmosphere, and affect the surrounding area mainly by wave trains, which have more denotative meaning of horizontal divergence to the precipitation variations. Likewise, water vapor accumulate significantly on the windward slope with transportation decrease at higher elevations on the vapor passage. Moisture varies significantly within the range of test area, variations of water vapor in the upstream dicide the precipitation in the downstream.
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