陈志雄,郄秀书,田野,王东方,袁善锋. 2017. 云分辨尺度下一种综合调整水物质含量的闪电资料同化方法[J]. 气象学报, ():-, doi:10.11676/qxxb2017.035
云分辨尺度下一种综合调整水物质含量的闪电资料同化方法
Assimilation of lightning data through comprehensively nudging water contents at cloud-resolving scale
投稿时间:2016-10-28  最后修改时间:2016-12-26
DOI:10.11676/qxxb2017.035
中文关键词:  闪电资料同化,WRF,临近预报,飑线
英文关键词:Lightning data assimilation, WRF, Nowcasting, Squall line
基金项目:国家自然科学基金;国家重点基础研究发展计划
作者单位E-mail
陈志雄 中国科学院大气物理研究所 chenzx@mail.iap.ac.cn 
郄秀书 中国科学院大气物理研究所 qiex@mail.iap.ac.cn 
田野 中国科学院大气物理研究所 tianye@mail.iap.ac.cn 
王东方 中国科学院大气物理研究所 wangdf@mail.iap.ac.cn 
袁善锋 中国科学院大气物理研究所 mryuans@163.com 
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全文下载次数: 183
中文摘要:
      在直接调整水汽含量(称为F12)和直接调整冰相粒子浓度(称为Q14)两种闪电资料同化方法的基础上,提出了一种综合调整冰相粒子浓度和水汽含量(称为C16)的闪电资料同化方法,选取一次具有完整闪电观测资料(云闪加地闪)的飑线过程,利用WRF在云分辨尺度进行数值模拟,详细比较了三种闪电资料同化方法的模拟结果。与不进行闪电资料同化的控制试验对比,闪电资料同化实验明显改进了模式对流活动的模拟能力,但是不同同化方法有所差异。在同化时段内,F12方法中回波强度较小,形成大范围层云区,回波中心比实测偏向下游;Q14方法回波强度和落区同实测最为接近,但是对层云区的模拟无明显改进;C16方法综合了F12和Q14方法的优势,同F12方法相比,回波强度增大,落区更加接近实测,层云区面积扩大。同化结束后,F12方法冷池有所增强,雨区向东北方向延伸,但是强度较弱,形成大范围的弱降水区,同化正面效果保持最久;Q14方法低层大气偏干,地表冷池偏强,对流系统迅速移动并衰减,降水区域比实测偏南,同化正面效果消失较快;C16方法冷池范围和强度与实际观测最为接近,降水较F12方法增强,模拟出的飑线形态得到调整,模拟出了实测中的另一降水中心,同化正面效果保持时间延长。
英文摘要:
      Based on two methods for assimilating lightning data which directly increase water vapor by Fierro et al. (denoted F12) and ice-phase particles by Qie et al. (denoted Q14), a combined method that comprehensively increases both water vapor and ice-phase particle (denoted C16) was presented. A squall line case with accurate total lightning observations was chosen to compare the effects of the three lightning assimilation methods mentioned above. Compared with the control experiment, the experiments that assimilated lightning data showed improved simulation for convection, however the simulations differed in assimilation experiments. During assimilation period, the F12 generated weak convections, formed a large part of stratiform clouds, and the convective core located downstream compared with the observations. The Q14 produced convections with strength and location matching the observations, but failed to improve the simulation of statiform clouds. The convections in C16 were strengthened with more accurate positions compared with the F12, as well as a larger part of statiform clouds in contrast to the Q14. After assimilation, in F12 cold pool was strengthened, light precipitation extended northeastwardly and the positive impacts due to lightning assimilation was sustainable. The relative dry lower-atmosphere in Q14 resulted in stronger cold pool and fast-moving squall line that weakened quickly, the precipitation was placed southwardly compared with observations and the positive impacts faded soon. The C16 performed best in simulating the coverage and magnitude of cold pool and the morphology of squall line with prolonged positive impacts, and large precipitation was successfully simulated.
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