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卫星云图资料反演的质量控制及变分同化数值试验
NUMERICAL EXPERIMENT ON QUALITY CONTROL AND VARIATIONAL ASSIMILATION OF SATELLITE IMAGE RETRIEVAL
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摘要: 该文针对数值化的GMS红外卫星云图资料的特点，利用改进的统计反演方法分别求出温度和湿度估计场，设计了几种订正方案对反演出的温度和湿度进行质量控制；控制后的反演场再与常规观测资料进行变分同化，最后用MM4模式进行了模拟对比试验.结果显示，在合理的泛函设计的基础上，质量控制的好坏直接影响预报结果.用分析场格点值进行订正效果优于用测站值直接订正，加上对云图反演的值进行系统误差订正后，有效提高了降水预报准确率.值得指出的是，加进云图资料后，明显改善了模式降水预报的强度和区域，与仅用常规探空资料相比更接近于实况.Abstract:
According to the characteristics of numerical GMS infrared imagery the improved statistic retrievalmethod is applied to estim the temperature and humidity. Several schemes are developed to control the quality of retrieved temperature and humidity in order to correct the errors from the image and the retrieval scheme. The variational assimilation is performed of the corrected retrieval field with the conventional observations followed by a control expenment by the MM4 model. Results show that the quality control is critical to the forecasting based onthe rationaldesigned function. The correction with the grid values is better than that of the conventional observation, and with the systematic error correction to the retrieval field included the accuracy of rainfall forecasting is improved. It is worth notice that the scheme with satellite image included can obviously improve the intensity and region forecasting of model rainfall and the prediction is more close to measured precipitation as compared with that only using the convendonal observations.
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Key words:
- Satellite image;
- Retrievalquality control;
- Variational ass imilation;
- MM4;
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1a 由样本统计的系统误差订正系数KNL
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1b 由样本统计的系统误差订正系数ENL
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表 2 非常规场与常规场相应要素之间的相关系数 (r) 和均方差 (σ)
表 3 质量控制方案 (无一一未进行订正；有一一进行订正)
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[1] Smith W L, Woolf H M, Hayden C M, Schreiner A J.The simultaneous export retrieval package.2nd International TOVS Study Conf., Igls, Austria, 18~22 Feb.1985.224~253. [2] Susskind J, RosenfieId J, Reuter D, Chah ine M T.Remote sensing ofweather andclimate parameters from HIRS/MSU on TIROS-Nm J.Geophs.Res., 1984, 89: 4677-4697. doi: 10.1029/JD089iD03p04677 [3] Chedin A, Scott N A, W ahiche C, Moulinier P.The improved initialization inversion method: a high resolution physical method for temperature retnevals from the TIROS-N series.J.Climate Appl.Meteor, 1985, 24: 128~143. doi: 10.1175/1520-0450(1985)024<0128:TIIIMA>2.0.CO;2 [4] Eyre J R.Inversion of cloudy satellite sounding radiances by nonlinear optimal estimation, Ⅰ: Theory and simulation for TOVS.QuapT.J.Roy.MeTeop Soc., 1989, 115: 1001-1026. doi: 10.1002/(ISSN)1477-870X [5] 沈桐立, 闵锦忠, 吴诚鸥, 温市耕.有限区域卫星云图资料变分分析的试验研究.高原气象, 1996, 15(1): 58-68. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX601.006.htm [6] 闵锦忠, 沈桐立, 等.泛函设计在云图同化中的应用及其对降水预报的影响.南京气象学院学报.2001, 24(1): (待发表) [7] 陈渭民, 等.卫星气象学.北京:气象出版社, 1989.118-125. -
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