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气象:2011,37(8):991-998
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“0911”华北暴雪的数值模拟及云微物理特征分析
(1.兰州大学大气科学学院,半干旱气候变化教育部重点实验室,兰州 730000;2.68210部队25分队,宝鸡 721002;3.国家气象中心,北京 100081)
A Numerical Simulation of Snowstorm in North China During 9-11 November 2009 and Its Cloud Microphysics
(1.Ministry of Education’s Key Laboratory of SemiArid Climate, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000;2.The 68210 Troops Headquarters, Baoji of Shaanxi 721002;3.National Meteorological Centre, Beijing 100081)
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投稿时间:2010-06-01    修订日期:2011-02-25
中文摘要: 采用国家气象中心的T639全球格点资料,利用中尺度数值模式WRF对2009年11月9—11日发生在华北地区的强降雪过程进行数值模拟,模拟结果显示:WRF模式可以较好地模拟出此次强降雪过程降水雨雪带的分布。诊断分析结果进一步表明,700 hPa西南低空急流对水汽的输送使得华北地区成为很强的湿度区,为强降雪的发生提供了充足的水汽条件。由于低空辐合,高空辐散,导致上升运动加强以及低层正涡度中心的产生和维持,由此产生的垂直方向上水汽凝结是此次暴雪的形成机制。借助新型卫星CloudSat的星载云廓线雷达(CPR)资料对比分析模拟的雪水和冰水含量表明,在中纬地区(39.9°N、117.3°E~33.7°N、115.5°E),分布形态与卫星观测的冰水含量对应相似,但量级比卫星观测偏小,而在低纬度(30.6°N、114.6°E~24.2°N、112.7°E)模式对冰水含量则完全没有模拟出来。
Abstract:Based on T639 (0.28125°×0.28125°) global grid data, the snowstorm process during 9-11 November 2009 in North China was simulated by WRF model. The results indicate that precipitation belt distribution in this process can be simulated well by WRF model. Diagnoses of the output data show that the vapor transported by the 700 hPa southwest jet flow made a humidity province in North China and prepared sufficient moist conditions for the snowstorm; the convergence of low level air flows and the divergence of upper air flows result in the strengthening of ascending motion and the genesis and maintenance of the center of low level positive vorticity, therefore the water vapor condensation in the vertical direction is the genesis mechanism of the snowstorm. Based on the CloudSat satellite data downloaded, the shape of ice water content distribution simulated in middle latitudes (39.9°N,117.3°E-33.7°N,115.5°E) is similar to ice water content of CloudSat, but in lower latitudes (30.6°N,114.6°E-24.2°N,112.7°E) the model simulated nothing.
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基金项目:国家科技支撑计划项目(2007BAC29B03;2009BAC53B02)共同资助
引用文本:
吴伟,邓莲堂,王式功,2011.“0911”华北暴雪的数值模拟及云微物理特征分析[J].气象,37(8):991-998.
WU Wei,DENG Liantang,WANG Shigong,2011.A Numerical Simulation of Snowstorm in North China During 9-11 November 2009 and Its Cloud Microphysics[J].Meteor Mon,37(8):991-998.