RESEARCH ON THE ADJUSTMENT OF INITIAL VALUE IN MOISTURE FIELD AND ITS CONTRIBUTION TO RAINFALL PREDICTION OVER SOUTH CHINA

Chang Yue; Xue Jishan; He Jinhai

Vol.11, NO.1, 2000

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2000 > 11(1): 35-46

Chang Yue, Xue Jishan, He Jinhai. Research on the adjustment of initial value in moisture field and its contribution to rainfall prediction over South China. J Appl Meteor Sci, 2000, 11(1): 35-46.

Citation:

Chang Yue, Xue Jishan, He Jinhai. Research on the adjustment of initial value in moisture field and its contribution to rainfall prediction over South China. J Appl Meteor Sci, 2000, 11(1): 35-46.

Chang Yue, Xue Jishan, He Jinhai. Research on the adjustment of initial value in moisture field and its contribution to rainfall prediction over South China. J Appl Meteor Sci, 2000, 11(1): 35-46.

Citation:

Chang Yue, Xue Jishan, He Jinhai. Research on the adjustment of initial value in moisture field and its contribution to rainfall prediction over South China. J Appl Meteor Sci, 2000, 11(1): 35-46.

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RESEARCH ON THE ADJUSTMENT OF INITIAL VALUE IN MOISTURE FIELD AND ITS CONTRIBUTION TO RAINFALL PREDICTION OVER SOUTH CHINA

1.
Guangdong Meteorological Bureau, Guangzhou 510080
2.
Nanjing Instiute of Meteorology, Nanjing 210044

Received Date: 1998-09-23
Rev Recd Date: 1999-08-11
Publish Date: 2000-02-29

Abstract

Abstract

By using the heating rate, which was calculated from the precipitation data derived from the GMS multichannel meteorological satellite, as the non-adiabatic forcing term of the non-adiabatic nonlinear normal-mode initialization process, the initial values of wind field were adjusted. And then using a counter operation scheme, which was contrary to the model's convective parameterization scheme, the initial values of the moisture field were adjusted to be sure that the heating rate calculated from the model′s physical parameterization scheme was in accordance with the heating rate derivde from the meteorological satellite. The method, which was in the frame of non-adiabatic nonlinear normal-mode initialization, had the initial vapor field adjusted. Not only has it achieved the goal of the traditional initialization, but also improved the model′s capability of the short-time prediction to precipitation. The results of two trials in South China indicate that the method is valid.
- Meteorological satellite data;
- Heating rate;
- Non-adiabatic nonlinear normal-mode initialization;
- Non-adiabatic forcing term;
- Convective parameterization scheme

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References(5)

Figures and Tables

图 1 加热率的垂直分布廓线

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图 2 (a) 的全场均方值 (b) 的全场均方值

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图 3 地面气压 (p_s) 的24 h时间序列 (a) (b) (c) (d) 依次为试验NSQ中坐标为 (22, 21), (43, 20), (15, 41), (43, 41) 点的p_s的时间序列

(图中细线为经过初值化处理, 粗线未经过初值化处理)

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图 4 1997年5月7~8日24 h降水量实况

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图 5 4种初值化方案作为初值所得到的24 h降水量预报 (1997年5月7~8日) (a)、(b)、(c)、(d) 依次为试验NSQ、NM、NS、M

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图 6 1997年5月7日00:00 (UTC) 卫星反演得到的1 h降水量 (实线) 以及6 h (5月6日18:00~7日00:00 (UTC)) 的降水量实况 (虚线)

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图 7 1998年1月14~15日24 h降水量实况

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图 8 4种初值化方案作为初值所得到的24 h降水量预报 (1998年1月14~15日) (a)、(b)、(c)、(d) 依次为试验NSQ、NM、NS、M

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图 9 1998年1月14日00:00 (UTC) 卫星资料反演1 h降水量 (实线) 以及6 h (1月13日18:00~14日00:00 (UTC)) 的降水量实况 (虚线)

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References

[1]	Krishnamurti T N, Jishan Xue, Bedi H S, et al. Kelin Ingles and O osterh of D. Physical initialization for numerical weather prediction over tropics. Tellus, 1991, 43 AB.
[2]	薛纪善, 李璨玑, 王志明.非线性正规模初值化原则在有限区域的实现.大气科学, 1992, 16(6):686~697. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK199206005.htm
[3]	沈如金, 纪立人, 张道民. 一个修改的BETTS对流调整方案和它的初步试验 (待发表).
[4]	Tadashi Tsuyuki. Variational data assimilation in the tropics using precipitation data part Ⅱ:3D model. Mon. Wea. Rev., 1996, 124:2545~2561. doi: 10.1175/1520-0493(1996)124<2545:VDAITT>2.0.CO;2
[5]	李建辉.气象卫星雷达数字化图像的分析应用.北京:气象出版社, 1992.