ZHONG Lan-di,ZHU Ke-yun,WANG Bing-yun,et al.An Analytical Study on the Radar Assimilation of Extraordinary Rainstorm under Steep Terrain[J].Journal of Chengdu University of Information Technology,2017,(02):165-174.[doi:10.16836/j.cnki.jcuit.2017.02.010]
陡峭地形特大暴雨的雷达资料变分同化试验研究
- Title:
- An Analytical Study on the Radar Assimilation of Extraordinary Rainstorm under Steep Terrain
- 文章编号:
- 2096-1618(2017)02-0165-10
- Keywords:
- meteorology; numerical simulation; three-dimensional assimilation; four-dimensional assimilation; radar reflectivity; radial velocity
- 分类号:
- P458.1+21.1
- 文献标志码:
- A
- 摘要:
- 为开展雷达基数据直接同化,并探究在川西陡峭地形下特大暴雨变分同化模拟中的效果,选取2013年7月9日-7月11日发生在都江堰地区的特大暴雨天气过程,使用具有WRFDA同化模块的WRF中尺度模式进行雷达资料同化,其中进入同化模块的雷达资料由雷达资料预处理系统(radar data preprocessing system,RDPS)处理生成。采用三维变分和四维变分同化对比、雷达基数据的单独同化和综合同化等方法开展试验,结果表明:使用RDPS系统可以较好处理陡峭地形的雷达资料。三维和四维变分同化试验均提高了降水预报水平,四维变分同化试验在降水预报综合评分上效果相对较好。两组单独同化反射率的试验较两组单独同化径向速度的试验对于西南东北走向的水汽辐合增量有较好的表现,表明反射率因子在水汽通量散度场中还是有较大的影响; 两组单独同化径向速度的试验均使风场在都江堰地区存在气旋性的风场辐合增量。
- Abstract:
- In order to explore the effects of the three-dimensional assimilation and four-dimensional assimilation of radar data generated in the extraordinary rainstorm simulation over the steep terrain in western Sichuan, this selects the heavy rain process from July 9th to July 11th in 2013 of Dujiangyan region uses WRF mesoscale model and its assimilation module WRFDA assimilative radar data to conduct the assimilative simulation test of the process. The results show that in the precipitation simulating test of complex terrain in western Sichuan, the precipitation forecast standard improved in both three and fourdimensional assimilation. Four-dimensional assimilation is relatively good on the overall precipitation forecast. Analying the increment of water vapor flux divergence in lower, the tests which assimilate radar reflectivity present convergence strengthening effect. The tests which assimilate radial velocity present divergence strengthening effect. Analying the increment of wind in lower, two groups of assimilation radar reflectivity test present obvious changes in the steep terrain. And four-dimensional assimilation with radar reflectivity changes the wind field which is affected by the Dujiangyan area and form a cyclonic convergence. Two groups of assimilation radial velocity test show a cyclonic wind field convergence increment in Dujiangyan area. Us RDPS processing radar data of the steep terrain and assimilating in the WRF model can good results.
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备注/Memo
收稿日期:2016-09-19 基金项目:国家自然科学基金资助项目(91437113、91537214)