Data assimilation of advanced precipitation radar to meso-scale numerical simulation and its application for rainfall and flood prediction

超前降水雷达中尺度数值模拟数据同化及其在降水洪水预报中的应用

• 批准号: 16360246
• 负责人: NAKAKITA Eiichi
• 金额: $ 9.73万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360246/
• 关键词: polarimetric radar; doppler radar; meso scale meteorological model; cloud resolving numerical simulation; typhoon; earth simulator; rainfall prediction; rain drop size distribution; 二偏波レーダー; 次世代型レーダー; メソ数値予報; 雲解像モデル; 短時間降雨予測; CReSS; COBRA

Many kinds of precipitation processes including convective rain and stratiform rain was observed by COBRA, 400MHz WPR and ground based rainfall observation devices in 2004 (baiu season, typhoon season) and in 2006 (baiu season, typhoon season, fall and winter season). The collected data have been used for investigation and development of cloud microphysical processes including analysis of rain drops size distribution (DSD), vertical profile of DSD, evaluation of polarimetric parameter of COBRA, and development of algorithms for DSD above melting layer by 400MHz WPR. Effectiveness of polarimetric parameters of multi parameter Doppler radar “COBRA" including horizontal radar echo (ZH), vertical radar echo (ZV), differential reflectivity (ZDR) and specific differential phase shift (KDP) has been investigated. Then effectiveness of linear depolarisation ratio (LDR) was shown by comparison of observed parameters and parameters estimated parametrically non-from DSD that was obtained by disdr … More ometer observation. Moreover, a rainfall rate estimation method has been built and evaluated by considering the polarimetric parameters.Extended Karman filter, ensemble Karman filter and four dimensional variation method have been applied to original hydrostatic numerical simulation model in order to develop assimilation methods for polarimetric parameters to cloud resolving numerical simulation. Then, it is found that ensemble Karman filter was the best way to assimilation.Meso scale processes inside typhoons were new point of view to investigate the growth and movement of typhoon. Therefore, analysis of COBRA data and numerical simulation were conducted. Then, eye wall corruption by impact of convective cell to eye wall organization was found by the analysis of COBRA data. Wind field simulated by CReSS was also analyzed for corruption of eye wall organization. Especially vorticity and divergence of horizontal wind was focused.These results were reported and will be used in the second stage that is grant-in-aid for scientific research (A) from 2007 to 2009. Less

利用COBRA、400MHz WPR和地面降水观测设备，在2004年（台风季、梅雨季）和2006年（台风季、梅雨季、秋冬季）观测到对流雨和层状云等多种降水过程。所收集的资料已被用于云微物理过程的研究和发展，包括雨滴谱分布（DSD）的分析，DSD的垂直廓线，评估COBRA的偏振参数，并开发了400MHz WPR的DSD融化层以上的算法。研究了COBRA多参数多普勒雷达极化参数（水平回波ZH、垂直回波ZV、微分反射率ZDR和微分相移KDP）的有效性。然后通过比较观测参数和非参数化估计的参数，证明了线性去极化比（LDR）的有效性 ...更多信息 测量仪观察在此基础上，建立了一种考虑偏振参数的降水率估算方法，并对该方法进行了评价，将扩展卡尔曼滤波、集合卡尔曼滤波和四维变分方法应用于原有的静力学数值模拟模式，以发展偏振参数同化方法用于云分辨数值模拟。结果表明，集合卡尔曼滤波是最好的同化方法，台风内部的中尺度过程是研究台风生长和移动的新视角。因此，对COBRA数据进行了分析和数值模拟。然后通过对COBRA数据的分析，发现对流单体对眼壁组织的影响导致了眼壁的破坏。同时对CReSS模拟的风场进行了风眼壁组织破坏分析。特别是涡度和水平风辐散，这些结果已被报道，并将用于2007 - 2009年第二阶段的科研资助（A）。少

项目成果

沖縄偏波降雨レーダ(COBRA)を用いた降雨の鉛直構造特性に関する研究

利用冲绳偏振降雨雷达（COBRA）研究降雨垂直结构特征

• 发表时间: 2005
• 期刊: 土木学会水工学論文集 Vol.49
• 作者: 中川 勝広;北村 康司;花土 弘;高橋 暢宏;井口 俊夫
• 通讯作者: 井口 俊夫

Drop Size Dstribution in Okinawa, Japan, from 2D-Video Distrometer and C-band Polarimetric Radar

来自 2D 视频测距仪和 C 波段偏振雷达的日本冲绳水滴尺寸分布

• 发表时间: 2004
• 期刊: European Conference on Radar in Meteorology and Hydrology (ERAD)
• 作者: V.N.Bringi;K.Nakagawa;M.Thurai;H.Hanado;T.Iguchi
• 通讯作者: T.Iguchi

Field campaign of observing precipitation in the 2004 rainy season of Okinawa, Japan

2004年日本冲绳雨季降水实地观测活动

• 发表时间: 2005
• 期刊: IGRASS/IEEE
• 作者: Nakagawa K;Y. Kitamura;K. Iwanami;H. Hanado;K. Okamoto
• 通讯作者: K. Okamoto

Three-dimensiona characteristics of polarimetric radar variables and their precipitation-type dependence

极化雷达变量的三维特征及其降水类型依赖性

• 发表时间: 2005
• 期刊: Proc 32nd Conf on Radar Meteor, AMS, Albuquerque, NM
• 作者: Shusse Y;K. Nakagawa;N. Takahashi;K. Iwanami;S. Satoh;T. Iguchi
• 通讯作者: T. Iguchi

Rainfall Estimation from C-Band Polarimetric Radar in Okinawa, Japan : Comparison with 2D-Video Disdrometer and 400 MHz Wind Profiler

日本冲绳 C 波段极化雷达的降雨量估算：与 2D 视频测速仪和 400 MHz 风廓线仪的比较

• 发表时间: 2006
• 期刊: Journal of Meteorological Society of Japan Vol. 84, No. 4
• 作者: V. N. Brinig;M;Thurai;K. Nakagawa;G. J. Huang;T. Kobayashi. A. Adachi;H. Hanado;S. Sekizawa
• 通讯作者: S. Sekizawa