Lu Hong, Zhai Panmao, Qin Weijian, et al. A particle swarm optimization-neural network ensemble prediction model for persistent freezing rain and snow storm in Southern China. J Appl Meteor Sci, 2015, 26(5): 513-524. DOI:  10.11898/1001-7313.20150501.
Citation: Lu Hong, Zhai Panmao, Qin Weijian, et al. A particle swarm optimization-neural network ensemble prediction model for persistent freezing rain and snow storm in Southern China. J Appl Meteor Sci, 2015, 26(5): 513-524. DOI:  10.11898/1001-7313.20150501.

A Particle Swarm Optimization-neural Network Ensemble Prediction Model for Persistent Freezing Rain and Snow Storm in Southern China

DOI: 10.11898/1001-7313.20150501
  • Received Date: 2014-12-04
  • Rev Recd Date: 2015-06-09
  • Publish Date: 2015-09-30
  • Based on daily minimum temperature, maximum temperature and precipitation data of 756 stations in China, National Center for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR) reanalysis data during 1951-2013 and NCEP 24 h forecast data, a nonlinear statistical ensemble prediction model based on the particle swarm optimization-neural network (PSONN-EPM) is developed for predicting and verifying the regional persistent freezing rain and snow storm process in southern China by analyzing and extracting significant predictors. Results show that model performance can be effectively improved when dividing low-temperature processes into the general process and severe process which are constructed based on cold extents, humidity and influence ranges of the freezing rain and snow storm processes. In 10-day independent forecast test, the average relative errors for the general process and the severe process are 2.04 and 0.6 using stepwise regression equation forecast method, while those are 1.33 and 0.30 by using PSONN-EPM technique. It means forecast errors are reduced by 0.71 and 0.3 as compared with the stepwise regression method. In addition, the predication result for the severe freezing rain and snow storm process is better than that for the general process. The PSONN-EPM integrates predictions of multiple ensemble members, thus the prediction accuracy and stability are higher than those of the traditional linear regression method. Furthermore, such method does not contain any tunable parameters, and is applicable for practical operational weather prediction.
  • Fig. 1  Correlation of PT value to 850 hPa temperature

    (the shaded denotes passing the test of 0.001 level)

    Fig. 2  Fitting values of general (a) and severe (b) processes by the particle swarm optimization-neural network ensemble prediction model

    Table  1  Cold rain and snow events in the study area during 1951-2013

    开始日期结束日期持续日数/d影响站数过程日最大
    冷湿指数
    1954-12-071954-12-159313.05
    1954-12-261955-01-10163070.42
    1956-01-061956-01-127620.18
    1956-01-201956-01-26749.08
    1957-01-121957-01-165420.86
    1957-02-041957-02-16131018.77
    1958-01-151958-01-19548.83
    1958-01-291958-02-047512.91
    1960-01-231960-01-28635.68
    1961-01-111961-01-16637.43
    1962-01-151962-01-291538.34
    1964-01-231964-02-0413822.9
    1964-02-151964-02-281446112.27
    1966-12-251967-01-12191117.74
    1967-02-101967-02-15646.56
    1968-02-011968-02-10101121.06
    1969-01-111969-01-1771726.24
    1969-01-281969-02-09132380.65
    1969-02-141969-02-281546.19
    1971-01-151971-02-05121663.73
    1972-12-291973-01-069613.25
    1972-02-031972-02-11951138.71
    1974-01-231974-02-12212965.51
    1975-12-081975-12-1582273.48
    1976-12-261977-01-17231836.67
    1977-01-261977-02-04102164.39
    1980-01-291980-02-13163879.62
    1981-01-251981-01-317917.59
    1982-02-061982-02-1510737.71
    1983-12-221984-01-0212751.72
    1983-01-081983-01-23161231.13
    1984-12-181984-12-31141331.27
    1984-01-161984-02-11272850.74
    1989-01-111989-01-166935.09
    1989-01-291989-02-091236.87
    1990-01-301990-02-046711.65
    1991-12-251991-12-317424.31
    1993-01-131993-01-24121423.36
    1996-02-171996-02-26103281.31
    1998-01-181998-01-258313.11
    2000-01-272000-02-0510625.30
    2004-02-032004-02-08637.63
    2008-01-132008-02-153471264.24
    2010-02-162010-02-205310.47
    2011-01-022011-02-013124118.86
    2012-01-212012-01-277614.64
    2013-01-022013-01-131257.28
    DownLoad: Download CSV

    Table  2  Predictors used in general process forecasting models (F=3)

    因子序号因子名称相关系数
    X3850 hPa江南区域气温-0.37
    X5非洲北部上空850 hPa与700 hPa温度差-0.37
    X8200 hPa印度半岛西北部与青藏高原区域高度差0.30
    X9500 hPa北太平洋北部与南部的高度差0.25
    X12700 hPa菲律宾北部区域的湿度-0.26
    X16500 hPa印度半岛与内蒙古区域的水平风速差0.34
    X17700 hPa印度半岛西北部区域水平风速0.27
    X18850 hPa太平洋夏威夷和库克群岛区域水平风速差0.34
    X21850 hPa长江中上游与越南北部区域垂直风速差0.34
    X22500 hPa孟加拉湾北部与蒙古区域的风速差0.40
    DownLoad: Download CSV

    Table  3  Predictors used in severe process forecasting models (F=3)

    因子序号因子名称相关系数
    X1850 hPa与700 hPa江南区域温度差-0.49
    X6850 hPa贝加尔湖区域温度0.35
    X9500 hPa贝加尔湖到我国东北区域高度0.42
    X12700 hPa长江中下游区域湿度0.43
    X13700 hPa孟加拉湾区域上空湿度0.43
    X14850 hPa孟加拉湾到越南北部上空湿度0.58
    X15850 hPa赤道索马里上空湿度-0.62
    X19850 hPa半太平洋北部区域与南部区域水平风速差0.36
    X23700 hPa鄂霍次克海与蒙古高原区域垂直风速差0.41
    X25850 hPa江南与东海区域垂直风速差0.58
    DownLoad: Download CSV

    Table  4  Statistics of predicted values of independent samples from two different processes using the particle swarm optimization-neural network ensemble prediction model

    一般过程 (F=3)严重过程 (F=3)
    实况值预报值误差相对误差/%实况值预报值误差相对误差/%
    6.395.44-0.951524.0632.708.6436
    5.004.82-0.18420.4129.469.0544
    7.288.521.241726.0936.1910.1039
    5.2511.396.1411721.2822.941.668
    4.8228.4523.6349065.6941.38-24.3137
    5.808.502.704747.3761.4214.0530
    3.816.392.5868118.8649.22-69.6459
    2.496.684.1916862.9560.33-2.624
    1.084.293.2129727.8227.830.011
    1.352.841.4911115.8622.146.2840
    DownLoad: Download CSV

    Table  5  Statistics of predicted values of independent samples from two different processes using stepwise regression equation

    一般过程 (F=3)严重过程 (F=3)
    实况值预报值误差相对误差/%实况值预报值误差相对误差/%
    6.396.840.45724.0645.0921.0387
    5.005.980.982020.4131.5511.1455
    7.288.491.211726.0938.4712.3847
    5.2511.436.1811821.289.50-11.7855
    4.8216.4911.6724265.6957.08-8.6113
    5.8011.355.559647.3763.7716.4035
    3.8110.196.38167118.8652.22-66.6456
    2.4910.808.3133462.9556.09-6.8611
    1.088.107.0265027.82-0.32-28.14101
    1.356.555.2038515.86-6.04-21.90138
    DownLoad: Download CSV

    Table  6  Statistics of predicted errors of independent samples from general processes using stepwise regression method and neural network method with different F values (unit:%)

    F=2F=3F=4
    逐步回归神经网络逐步回归神经网络逐步回归神经网络
    3720715018
    48252042118
    24917172614
    1279111811712598
    250323242490246723
    1165196478929
    184761676814841
    390285334168291132
    678386650297573241
    532279385111328151
    DownLoad: Download CSV

    Table  7  Statistics of predicted errors of independent samples from severe processes using stepwise regression method and neural network method with different F values (unit:%)

    F=2F=3F=4
    逐步回归神经网络逐步回归神经网络逐步回归神经网络
    5320873610763
    692554411446
    562547398944
    86265582030
    2311337333
    403035302928
    475456595161
    0291141014
    109151011577
    18859138405067
    DownLoad: Download CSV

    Table  8  Statistics of predicted values of independent samples from all the samples using the particle swarm optimization-neural network ensemble prediction model

    实况值F=2F=3F=4
    预报值误差相对误差/%预报值误差相对误差/%预报值误差相对误差/%
    6.3921.3514.9623419.4513.0620426.0419.65308
    5.0010.755.7511510.875.8711717.8612.86257
    7.2814.997.7110614.216.939519.0611.78162
    5.2515.2810.0319117.5912.3423520.7215.47295
    4.8216.4411.6224114.729.9020521.0816.26337
    5.8013.247.4412811.395.599622.2816.48284
    3.813.890.0826.833.02797.803.99105
    2.492.880.39163.921.43570.84-1.6566
    1.081.110.0331.800.72677.296.21575
    1.350.74-0.61451.680.33253.091.74129
    DownLoad: Download CSV
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    • Received : 2014-12-04
    • Accepted : 2015-06-09
    • Published : 2015-09-30

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