多普勒雷達(dá)資料三維變分直接同化方法研究.pdf

1、中國(guó)氣象科學(xué)研究院;南京信息工程大學(xué)博士學(xué)位論文多普勒雷達(dá)資料三維變分直接同化方法研究姓名：顧建峰申請(qǐng)學(xué)位級(jí)別：博士專(zhuān)業(yè)：氣象學(xué)指導(dǎo)教師：顏宏;薛紀(jì)善20060501IIABSTRACTDirect assimilation of Doppler radial velocity and radar reflectivity that arenon- model variables is a challenge. With an ulti

2、mate goal of operationalapplication of Doppler radar data in numerical weather prediction (NWP), thedirect assimilation procedure of Doppler radar observations usingthree- dimensional variational (3DVAR) data assimilatio

3、n method is setup forthe Weather Research and Forecasting (WRF) model. Numerical experimentswith the WRF 3DVAR system are conducted for the initialization of TyphoonRusa (2002), squall line, mesoscale rainstorm and landf

4、alling Typhoon Matsa(2005). The Doppler radar data assimilation in WRF 3DVAR system is robustwith the data from diverse radar stations, including Jindo radar observations inKorea, IHOP_2002 (International H2O Project) WS

5、R- 88D observations in theUnited States and the Shanghai WSR- 88D observations in China, respectively.The major research works and the primary conclusions are summarized asfollows:(1) To assimilate Doppler radial velocit

6、y and radar reflectivity data, thevertical velocity increments, cloud microphysics processes and observationoperators of the radar observations are introduced into the WRF 3DVARsystem. The tangent linear and adjoint prog

7、rams in WRRF 3DVAR are verifiedwithin the expected accuracy. The developed Doppler radar data assimilationscheme is efficient for the WRF analyses, which are consistent with the WRFdynamical, thermodynamical and other mo

8、del parameters by blending ofdifferent mesoscale observation data.(2) Doppler radial velocities from the Korean Jindo radar are directlyassimilated into the WRF 3DVAR system for Typhoon Rusa (2002) case.Assimilation and

9、simulation results show that vertical velocity increments,tuning of scale- lengths in recursive filter, GTS (the Global TelecommunicationsSystem) data and AWS (Automatic Weather Station) data, are all to improvethe perfo

10、rmance of Typhoon initial vortex and subsequent prediction. Thedirect assimilation of radial velocities has especially positive impact. It caneffectively extract the useful information from radar observations and produce

11、a positive impact on Typhoon vortex initialization and landfall prediction.(3) Experiments of initialization and subsequent forecast for a squall lineobserved during IHOP_2002 campaign in United States are carried out us