ISSN 1006-8775CN 44-1409/P

NUMERICAL EXPERIMENTS FOR THE EFFECTS OF TWO MODEL INITIALIZATION SCHEMES ON RAINFALL FORECAST IN THE 2008 FLOODING SEASON


  • Revised Date: 28 April, 2014
  • In this paper, based on heavy rain numerical forecast model AREM (Advanced Regional Eta Model), two different initialization schemes, LAPS and GRAPES-3DVAR, are used to run assimilation experiments of AREM-LAPS and AREM-3DVAR with the same data source (NCEP forecast field, surface data and radio-soundings) during the period from 21 May to 30 July 2008 to investigate the effect of the two initialization schemes on the rainfall simulation. The result suggests that: (1) the forecast TS score by the AREM-LAPS is higher than that by the AREM-3DVAR for rainfall in different areas, at different valid time and with different intensity, especially for the heavy rain, rainstorm and extremely heavy rain; (2) the AREM-3DVAR can generally simulate the average rainfall distribution, but the forecast area is smaller and rainfall intensity is weaker than the observation, while the AREM-LAPS significantly improves the forecast; (3) the AREM-LAPS gives a better forecast for the south-north shift of rainfall bands and the rainfall intensity variation than the AREM-3DVAR; (4) the AREM-LAPS can give a better reproduction for the daily change in the mean-rainfall-rate of the main rain band, and rainfall intensity changes in the eastern part of Southwest China, the coastal area in South China, the middle-lower valleys of Yangtze river, the Valleys of Huaihe river, and Shandong peninsula, with the rainfall intensity roughly close to the observation, while the rainfall intensity simulated by the AREM-3DVAR is clearly weaker than the observation, especially in the eastern part of Southwest China; and (5) the comparison verification between the AREM-LAPS and AREM-3DVAR for more than 10 typical rainfall processes in the summer of 2008 indicates that the AREM-LAPS gives a much better forecast than AREM-3DVAR in rain-band area, rainfall location and intensity, and in particular, the rainfall intensity forecast is improved obviously.
  • [1]
    YU Ru-cong. The design of the limited area numerical weather prediction model with steep mountains [J]. Chin. J. Atmos. Sci., 1989, 13(2): 145-158.
    [2]
    YU Ru-cong. Two-step shape-preserving advection scheme [J]. Adv. Atmos. Sci., 1994, A11 (4): 479-490.
    [3]
    YU Ru-cong. Application of a shape-preserving advection scheme to the moisture equation in an E-grid regional forecast model [J]. Adv. Atmos. Sci., 1995, 12(1): 13-19.
    [4]
    YU Ru-cong, XUE Ji-shan, XU You-ping, et al. An advanced regional Eta-coordinate numerical heavy-rain prediction model (AREM) system (AREMS) [M]. Beijing: China Meteorological Press, 2004: 45-49 (in Chinese).
    [5]
    GONG Ying, WANG Ye-hong, LAI An-wei. Evaluation and analysis of rain prediction effect of three models in Southwest in 2008 [J]. Plateau Meteor., 2010, 29(6): 1441-1451 (in Chinese).
    [6]
    YE Cheng-zhi, PAN Zhi-xiang, Cheng Rui, et al. The numerical research of the primary mechanism of the offing reinforcement of typhoon Rananim based on AREM [J]. Acta Meteor. Sinica, 2007, 65(2): 208-220 (in Chinese).
    [7]
    LI Jun, WANG Ming-huan, GONG Ying, et al. Precipitation verifications to an ensemble prediction system based on AREM [J]. Torr. Rain Disast., 2010,29 (1): 30-37 (in Chinese).
    [8]
    LI Jun, DU Jun, WANG Ming-huan, et al. Precipitation verifications to an ensemble prediction system using two initial perturbation schemes based on AREM [J]. J. Trop. Meteor., 2010, 26(6): 733-742 (in Chinese).
    [9]
    ZHAO Yu-chun, WANG Ye-hong. Numerical study on the effect of topography upon “6?22” heavy rain in eastern Hubei [J]. Acta Meteor. Sinica, 2004, 62(Suppl.): 19-27 (in Chinese).
    [10]
    WANG Ye-hong, WANG Zhi-bin. A test for real-time precipitation forecast during 2002-flood season with AREM model [J]. Meteor. Mon., 2005, 31(2): 17-22 (in Chinese).
    [11]
    ZHANG Hua, XUE Ji-shan, ZHUANG Shi-yu, et al. Ideal experiments of GRAPES three-dimensional variational data assimilation system [J]. Acta Meteor. Sinica, 2004, 62(1): 31-41 (in Chinese).
    [12]
    ZHAO Ying, WANG Bin. Numerical experiments for typhoon Dan incorporating AMSU-A retrieved data with 3DVM [J]. Adv. Atmos. Sci, 2008, 25(4): 692-703 (in Chinese).
    [13]
    MCGINLEY J A, ALBERS S C, STAMUS P A. Local data assimilation and analysis for nowcasting [J]. Adv. Space Res., 1992, 12(7): 179-188.
    [14]
    ALBERS S C, MCGINLEY J A, BIRKENHUER D A, et al. The local analysis and prediction system (LAPS): Analysis of clouds, precipitation and temperature [J]. Wea. Forecast., 1996, 11(3): 273-287.
    [15]
    LIU Zhi-xiong, DAI Ze-jun, PENG Ju-xiang, et al. Mechanism analysis of a local strong hail based on LAPS [J]. Torr. Rain Disast., 2009, 28(4): 313-320 (in Chinese).
    [16]
    ZHOU Hou-fu, GUO Pin-wen, ZHAI Jing, et al. Application of LAPS analysis field in rainstorm mesoscale analysis [J]. Plateau Meteor., 2010, 29(2): 461-470 (in Chinese).
    [17]
    CHEN Jia-rong, HUANG Wei-peng, WANG Wen-he, et al. Review of LAPS nowcasting system's forecasts in 2006 Mei-Yu and typhoon season [C]// Proc. 2007 Cross-Strait Meteorological Science and Technology Workshop. 2007: 114-120 (in Chinese).
    [18]
    JIAN Guo-ji, MCGINLEY J A. Evaluation of a short-range forecast system on quantitative precipitation forecasts associated with tropical cyclones of 2003 near Taiwan [J]. J. Meteor. Soc. Japan, 2005, 83: 657-681.
    [19]
    SNOOK J S, CRAM J M, SCHMIDT J M. LAPS/RAMS, A nonhydrostatic mesoscale numerical modeling system configured for operational use [J]. Tellus, 1995, 47A: 864-875.
    [20]
    SHAW B L, THALER E R, SZOKE E J. Operational evaluation of the LAPS?MM5 "hot start" local forecast model[C]. 18th Conf. on Wea. Anal. and Forecast., Ft. Lauderdale: Amer. Meteor. Soc., 2001: 160-164.
    [21]
    ETHERTON B, SANTOS P. Sensitivity of WRF Forecasts for South Florida to Initial Conditions [J]. Wea. Forecast., 2008, 23: 725-740.
    [22]
    LI Hong-li, CUI Chun-guang, WANG Zhi-bin. Scientific designs, functions and applications of LAPS [J]. Torr. Rain Disast., 2009, 28(1): 64-70 (in Chinese).
    [23]
    LI Hong-li, WAN Rong, XIE You-cai. Application of ground-based GPS water vapor in LAPS [J]. J. Trop. Meteor., 2010, 26(6): 702-709 (in Chinese).
    [24]
    LI Guo-jing, XU You-ping, CHENG Wei, et al. Doppler radar data assimilation sensitivity experiment on a heavy rain event [J]. Torr. Rain Disast., 2009, 28(2): 97-103 (in Chinese).
    [25]
    WANG Yu. Verification of NMC subjective and objective precipitation prediction during the main flood season in 2002 [J]. Meteor. Mon., 2003, 29(5): 21-25 (in Chinese).
    [26]
    WANG Yu, YAN Zhi-hui. Effect of different verification schemes on precipitation verification and assessment conclusion [J]. Meteor. Mon., 2007, 33(12): 53-61 (in Chinese).
    [27]
    WANG Ye-hong, ZHAO Yu-chun, ZHANG Bing. Verifications of precipitation forecasts from advanced AREMS during 2003 flood season [J]. J. Trop. Meteor., 2005, 21(6): 597-604 (in Chinese).
    [28]
    GONG Ying. Evaluation and analysis of the rainfall prediction of AREM in flood season of 2007 [J]. Torr. Rain Disast., 2007, 26(4): 372-380 (in Chinese).
    [29]
    YANG Jing-an, MENG Ying-jie. Main heavy rain process in China during May to September in 2008 [J]. Torr. Rain Disast., 2008, 27(4): 378-382 (in Chinese).
    [30]
    YANG Jing-an, MENG Ying-jie. Main heavy rain process in China during May to September in 2008 (continue) [J]. Torr. Rain Disast., 2008, 28(1): 92-95 (in Chinese).

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WANG Ye-hong, PENG Ju-xiang, ZHAO Yu-chun. NUMERICAL EXPERIMENTS FOR THE EFFECTS OF TWO MODEL INITIALIZATION SCHEMES ON RAINFALL FORECAST IN THE 2008 FLOODING SEASON[J]. Journal of Tropical Meteorology, 2014, 20(3): 251-266.
WANG Ye-hong, PENG Ju-xiang, ZHAO Yu-chun. NUMERICAL EXPERIMENTS FOR THE EFFECTS OF TWO MODEL INITIALIZATION SCHEMES ON RAINFALL FORECAST IN THE 2008 FLOODING SEASON[J]. Journal of Tropical Meteorology, 2014, 20(3): 251-266.
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  • Manuscript revised: 28 April, 2014

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