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雷达资料在登陆台风“桑美”数值模拟中的应用

施丽娟 许小峰 李柏 杨洪平 许凤雯

施丽娟, 许小峰, 李柏, 等. 雷达资料在登陆台风“桑美”数值模拟中的应用. 应用气象学报, 2009, 20(3): 257-266..
引用本文: 施丽娟, 许小峰, 李柏, 等. 雷达资料在登陆台风“桑美”数值模拟中的应用. 应用气象学报, 2009, 20(3): 257-266.
Shi Lijuan, Xu Xiaofeng, Li Bai, et al. Application of Doppler radar data to the landfalling Typhoon Saomai simulation. J Appl Meteor Sci, 2009, 20(3): 257-266.
Citation: Shi Lijuan, Xu Xiaofeng, Li Bai, et al. Application of Doppler radar data to the landfalling Typhoon Saomai simulation. J Appl Meteor Sci, 2009, 20(3): 257-266.

雷达资料在登陆台风“桑美”数值模拟中的应用

资助项目: 

国家自然科学基金资助项目 40575029

Application of Doppler Radar Data to the Landfalling Typhoon Saomai Simulation

  • 摘要: 将国内多普勒天气雷达的反射率因子及径向风资料引入ARPS-3DVar同化系统进行同化,针对2006年登陆浙江苍南并造成严重影响的超强台风“桑美”,探讨多普勒雷达资料同化对台风模拟初始场和预报场的改进作用。结果表明:利用ARPS-3DVar同化雷达资料可以明显改善6 h同化窗口内的降水、风场和回波结构,并能提高模式对中尺度雨团位置、强度的模拟能力;雷达资料初始场同化后模拟的台风涡旋和台风眼结构与位置更加接近实况,各物理量空间分布结构更具有明显中尺度特征,从而改善了台风路径和降水的预报。但模拟过程中台风强度模拟偏弱,有待进一步改进。
  • 图  1  同化窗口内2006年8月10日06:00 1 h降水量(单位:mm)(a)雷达反演,(b)同化试验,(c)控制试验

    Fig. 1  1-hour precipitation in the initial time windows at 06:00 10 Aug 2006(unit:mm)(a) retrieved rainfall fromr adar observation, (b) assimilation test, (c) control test

    图  2  同化窗口内2006年8月10日06:00海平面的流场和全风速(阴影,单位:m/s)(a)控制试验,(b)同化试验

    Fig. 2  Streamline filed and wind speed (shadow, unit: m/s) in the initial time windows at 06:00 10 Aug 2006(a) control test, (b) assimilation test

    图  3  2006年8月10日06:00温州多普勒天气雷达径向风速度(单位:m/s)

    Fig. 3  Radial velocity observed by Wenzhou radar at 06:00 10 Aug 2006(unit:m/s)

    图  4  同化窗口内雷达同化试验、控制试验模拟台风路径与实况台风路径

    Fig. 4  The track of typhoon Saomai in the initial time windows simulated by radar assimilation test, by control tset and observation

    图  5  同化窗口内2008年8月10日06:00组合反射率(单位:dBz)(a)同化试验,(b)温州雷达观测,(c)控制试验

    Fig. 5  The composite reflectivity in the initial time windows at 06:00 10 Aug 2006(unit:dBz) (a) assimilationtest, (b) observed by Wenzhou radar, (c) controltes

    图  6  同化窗口内2006年8月10日06:00沿台风中心垂直径向剖面上的物理量(a)同化试验涡度(阴影,单位:10-5s-1)和散度(等值线,单位:10-3s-1),(b)控制试验涡度(阴影,单位:10-5s-1)和散度(等值线,单位:10-3s-1),(c)同化试验qc(阴影,单位:g/kg)和uv-w风场(矢量,单位:m/s),(d)控制试验qc(阴影,单位:g/kg)和uv-w风场(矢量,单位:m/s),(e)同化试验θe(单位:K),(f)控制试验θe(单位:K

    Fig. 6  The cross section of physical variables along typhoon center at 06:00 10 Aug 2006, vorticity (shadow, unit:10-5s-1), divergence (contour, unit:10-3s-1) in assimilation test (a) and in control test (b), qc(shadow, unit:g/kg), uv-w wind (vector, unit:m/s) in assimilation test (c) and in control test (d), θe(unit:K) in assimilation test (e) and in control test (f)

    图  7  1 h降水量(单位:mm)

    Fig. 7  1-hour precipitation (unit:mm)

    图  8  同化试验、控制试验模拟的“桑美”台风路径预报与实况路径

    Fig. 8  The track of typhoon Saomai simulated by radar assimilation test, by control tset and the observation

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出版历程
  • 收稿日期:  2008-03-04
  • 修回日期:  2009-02-16
  • 刊出日期:  2009-06-30

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