论文

一次甘肃强降水过程的数值模拟与诊断分析

  • 杨显玉 ,
  • 文军 ,
  • 王大勇 ,
  • 李江林
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  • 中国科学院寒区旱区环境与工程研究所寒旱区陆面过程与气候变化重点实验室, 兰州 730000;2. 高原大气与环境四川省重点实验, 成都 610225;3. 中国科学院大学, 北京 100049;4. 山西省气候中心, 太原 030006

收稿日期: 2013-12-20

  网络出版日期: 2016-06-28

基金资助

高原大气与环境四川省重点实验室开放课题(PAEKL-2016-C1);中国科学院寒旱区陆面过程与气候变化重点实验室开放基金(2015);国家自然科学基金项目(41375022,41530529);中国科学院重点部署项目(KZZD-EW-13)

Numerical Simulation and Diagnostic Analysis on a Rainstorm Event in Gansu

  • YANG Xianyu ,
  • WEN Jun ,
  • WANG Dayong ,
  • LI Jianglin
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  • Cold and Arid Regions Environmental Research Institute, Chinese Academy of Science, Lanzhou 730000, China;2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China;3. University of Chinese Academy of Science, Beijing 100049, China;4. Shanxi Climate Center, Taiyuan 030006, China

Received date: 2013-12-20

  Online published: 2016-06-28

摘要

利用WRF 模式对2012 年5 月10-11日甘肃岷县的一次强降水过程进行了数值模拟和诊断分析。结果表明:WRF模式较好地再现了此次暴雨天气过程,在暴雨落区和强度量级上接近实况。四川盆地的西南风从孟加拉湾携带暖湿水汽向北输送,最大值达到16 kg·m-1·s-1·hPa-1,为该地区降水提供了水汽条件。在暴雨发生前,大气能量有个累积的阶段,在暴雨发生时能量开始释放,到暴雨结束时能量释放完;在暴雨发生时,降水落区上空整层均为上升气流,中心强度达到0.5 m·s-1。这种强上升运动不仅使得暖湿空气辐合抬升,而且在上升过程中释放潜热,加热大气,使得垂直运动增强,形成正反馈。模拟的CAPE和雷达反射率因子等物理量均对此次降水过程有较好的指示意义。

本文引用格式

杨显玉 , 文军 , 王大勇 , 李江林 . 一次甘肃强降水过程的数值模拟与诊断分析[J]. 高原气象, 2016 , 35(3) : 726 -733 . DOI: 10.7522/j.issn.1000-0534.2015.00048

Abstract

WRF model was used to numerical simulation and diagnostic analyze on a rainstorm occurred in Min county,Gansu Province on 10 May 2012.The results illustrate that:The WRF model is potential in simulating and predicting this precipitation process,including the rainfall area and intensity.This precipitation was fed by a southwesterly flow around Sichuan basin which carried warm and moist air from Bengal Bay,and the maximum value of water vapor flux was up to 16 kg·m-1·s-1·hPa-1.Before the rainstorm,the atmospheric energy was accumulated and stored.The energy was released at the beginning of the rainfall and dissipated by the end of the rainstorm.During this precipitation,the whole atmospheric layer was ascending,and the maximum value of vertical speed was up to 0.5 m·s-1.This ascending motion not only made the warm and moist air convergence but also released latent heat and heated atmosphere,hence a positive feedback was formed and the vertical movement was strengthen.The precipitation process can be explored through the simulation of the CAPE and radar reflectivity factor and other physic index from the WRF model.

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