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《Chinese Journal of Atmospheric Sciences》 2006-02
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Effect of Direct Assimilation of Precipitation on Initial Field

SHAO Ming-Xuan~(1,2),CHEN Min~(2),TAO Zu-Yu~(3),and ZHONG Ji-Qin~(2)1 National Meteorological Center,Beijing 1000812 Institute of Urban Meteorology,China Meteorological Administration,Beijing 1000893 Department of Atmospheric Science,School of Physics,Peking University,Beijing 100871  
Four-dimensional variational data assimilation(4D-VAR) is a logical and rigorous mathematical method to obtain the "best" estimate of the model initial conditions from observations and model itself.It is one of the most advanced data assimilation methods today. Automation weather station(AWS) precipitation data are assimilated by 4D-VAR directly,and the increment of initial field is analyzed.The effect of precipitation assimilation on the moisture field and temperature field is more obvious than on other element fields,and the effect on low levels is more evident than on high levels.Most of the maximum increments appear between 925 hPa and 850 hPa.Because of precipitation assimilation,the convective instability is enhanced in Beijing area.Analysis of wind field increments shows that some mesoscale information is added to the initial field.The increments of divergence and moisture flux divergence show the tendency that convergence is enhanced in low levels.By assimilating precipitation,the cloud water and rainwater appear in the initial field while there is not any cloud water and rainwater in the original initial field of MM5.But the effect of assimilation on the vertical circulation of the initial field is not evident.In the experiment,the increment of test II in which 6-hour accumulative rainfall is assimilated is more obvious in most situations than that of test I in which 6-hour hourly precipitation is assimilated.This is because the test I contains more information of rain time than test II and the test II has less limitation than test I.By the increments of test II,effect of precipitation assimilation on the initial field is more evident.However,test II also shows that if only precipitation data are assimilated,effect of assimilation is not always good.The rain structure in test I is simulated better than that in test II.Experiment results show that,due to addition of information of AWS precipitation data,the initial fields of test I and test II are enhanced in mesoscale information,which are more consistent with the model in thermo-dynamical mechanism.After assimilating,the simulation of torrential rain is improved.The precipitation during the early period of simulation is increased,and the position of simulated precipitation is more consistent with real situation.The "spin-up" problem of the model is weakened.
【Fund】: 北京市自然科学基金项目8032009;; 北京市科委奥运项目H020620190091;; 国家自然科学基金重点项目40233036
【CateGory Index】: P456.7
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【References】
Chinese Journal Full-text Database 4 Hits
1 CHEN Min,ZHONG Jiqin,ZHENG Zuofang Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089;Four Dimensional Variational Data Assimilation of Multiple Types of Observations for a Severe Storm in Beijing Area[J];Acta Scientiarum Naturalium Universitatis Pekinensis;2007-04
2 HE Guang-bi1,2,LI Shu-jun3,HUA Ming4(1.Institute of Plateau Meteorology,CMA,Chengdu 610072,China;2.Dept.of Atmospheric Science,YNU,Kungming 650091,China;3.Observatory of Sichuan Province,Chengdu 610041,China;4.Chengdu Bureau of Meteorology,Chengdu 610041,China);Sensitivity experiment of initial values in meso-scale model including data of encrypted automatic observation stations[J];Journal of Chengdu University of Information Technology;2008-01
3 CHEN Min, ZHONG Jiqin, ZHENG Zuofang Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089;Four Dimensional Variational Data Assimilation of Multiple Types of Observations for a Severe Storm in Beijing Area[J];Acta Scientiarum Naturalium Universitatis Pekinensis;2008-05
4 XU Zhifang, GONG Jiandong, and LI ZechunNational Meteorological Center, Beijing 100081;A Study of Assimilation of Surface Observational Data in Complex Terrain Part Ⅲ: Comparison Analysis of Two Methods on Solving the Problem of Elevation Difference between Model Surface and Observation Sites[J];Chinese Journal of Atmospheric Sciences;2009-06
【Citations】
Chinese Journal Full-text Database 1 Hits
1 SHAO Mingxuan~(1),2)) CHEN Min~(2)) TAO Zuyu~(1)) CHEN Lu~(3))(()~(1)) Department of Atmosphere, School of Physics, Peking University, Beijing, 100871; ()~(2)) Institute of Urban Meteorology, CMA, Beijing, 100089;()~(3))Beijing Meteorological Bareau,Beijing,100089);Four-Dimensional Variational Assimilation of AWS Precipitation Data[J];Acta Scicentiarum Naturalum Universitis Pekinesis;2005-05
【Co-citations】
Chinese Journal Full-text Database 4 Hits
1 CHEN Min,ZHONG Jiqin,ZHENG Zuofang Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089;Four Dimensional Variational Data Assimilation of Multiple Types of Observations for a Severe Storm in Beijing Area[J];Acta Scientiarum Naturalium Universitatis Pekinensis;2007-04
2 CHEN Min, ZHONG Jiqin, ZHENG Zuofang Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089;Four Dimensional Variational Data Assimilation of Multiple Types of Observations for a Severe Storm in Beijing Area[J];Acta Scientiarum Naturalium Universitatis Pekinensis;2008-05
3 XU You-ping,JIANG Hong-feng,LI Kun,CHENG Rui (Beijing Institute of Applied Meteorology,Beijing 100029);Preliminary Studies on the Effect of Initial Uncertainties on Heavy Rainfall Forecast[J];Torrential Rain and Disasters;2007-01
4 HU Hai-bo,LIU Wei-dong,LI Qing-chun,CHENG Cong-lan Institute of Urban Meteorology,CMA,Beijing 100089,China;Web GIS application of publishing data collected by Automatic Weather Station and its key algorithm[J];Computer Engineering and Applications;2007-30
【Co-references】
Chinese Journal Full-text Database 9 Hits
1 SHAO Mingxuan~(1),2)) CHEN Min~(2)) TAO Zuyu~(1)) CHEN Lu~(3))(()~(1)) Department of Atmosphere, School of Physics, Peking University, Beijing, 100871; ()~(2)) Institute of Urban Meteorology, CMA, Beijing, 100089;()~(3))Beijing Meteorological Bareau,Beijing,100089);Four-Dimensional Variational Assimilation of AWS Precipitation Data[J];Acta Scicentiarum Naturalum Universitis Pekinesis;2005-05
2 DING Wei-Yu,WAN Qi-Lin,YAN Jing-Hua,MENG Wei-Guang,and CHEN Zi-TongGuangzhou Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510080;Variational Assimilation of Automatic Weather Stations Rainfall in Convective Systems and its Impact on Rain Forecast[J];Chinese Journal of Atmospheric Sciences;2006-02
3 XU Zhi-Fang, GONG Jian-Dong, WANG Jian-Jie, and LI Ze-Chun National Meteorological Center, Beijing 100081;A Study of Assimilation of Surface Observational Data in Complex Terrain Part I: Influence of the Elevation Difference Between Model Surface and Observation Site[J];Chinese Journal of Atmospheric Sciences;2007-02
4 XU Zhi-Fang,GONG Jian-Dong,WANG Jian-Jie,and LI Ze-ChunNational Meteorological Center,Beijing 100081;A Study of Assimilation of Surface Observational Data in Complex Terrain Part II:Representative Error of the Elevation Difference Between Model Surface and Observation Site[J];Chinese Journal of Atmospheric Sciences;2007-03
5 Xu Xihua (National Research Center for Marine Environment Forecasts);ADVANCES IN RESEARCH OF CUMULUS CONVECTION PARAMETERIZATION SCHEME[J];Plateau Meteorology;1991-01
6 Chen Bomin QianZhengan (Lanzhou Institute of Plateau Atmospheric Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000);A REVIEW ON THE PROBLEMS OF CUMULUS PARAMETERIZATION[J];Plateau Meteorology;1992-02
7 CHENG Lin sheng, FENG Wu hu (Department of Atmospheric Science, Lanzhou University, Lanzhou 730000, China);A Number of Advances of the Research on Midlatitude Mesoscale Convective Systems[J];Plateau Meteorology;2002-04
8 TUO Ya1,LIANG Haihe2,MA Shufen2,ZHU Fukang2 (1.National Meteorological Center;2.Chinese Academy of Meteorological Science,Beijing100081,China);A Preliminary Research on Improving MM5 Initial Fields Using Radar Data[J];Journal of Nanjing Institute of Meteorology;2003-05
9 CHEN Dong-sheng,SHEN Tong-li,MA Ge-lan,HE Di Environmental Variation,NIM,Nanjing210044,China);Advances in the Meteorological Data Assimilation[J];Journal of Nanjing Institute of Meteorology;2004-04
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