雷達(dá)回波強(qiáng)度與雨滴譜參數(shù)的相關(guān)性研究

doi:10.3969/2016jms.0078

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雷達(dá)回波強(qiáng)度與雨滴譜參數(shù)的相關(guān)性研究
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                        10.3969/2016jms.0078
                    
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基金項(xiàng)目:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）項(xiàng)目（2010CD950804）

The correlation research between radar echo intensity and characteristic of raindrop size distribution

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摘要:

在雷達(dá)定量探測降水方面，目前大都采用雷達(dá)回波強(qiáng)度與降水強(qiáng)度的相關(guān)性來定量估算，但雷達(dá)回波強(qiáng)度與降水強(qiáng)度并非一一對應(yīng)。本文利用從廬山和南京收集到的雷達(dá)觀測資料和同步Parsivel觀測到的雨滴譜數(shù)據(jù)，建立雷達(dá)回波強(qiáng)度與不同雨滴譜參數(shù)的函數(shù)關(guān)系，將由確定的函數(shù)關(guān)系式擬合后的雷達(dá)回波強(qiáng)度與雷達(dá)實(shí)測的回波強(qiáng)度作對比，以檢驗(yàn)假定函數(shù)關(guān)系式的合理性，同時(shí)通過對比兩地兩類云降水?dāng)M合值的相對誤差，給出了函數(shù)關(guān)系式中的最優(yōu)y選項(xiàng)，為雷達(dá)定量估算降水量尋找新的途徑。研究結(jié)果表明：廬山和南京兩地兩類云降水的雨滴譜參數(shù)對雷達(dá)回波強(qiáng)度的擬合普遍較好，其中對流云降水的擬合都明顯好于層狀云降水。兩地層狀云降水中各個(gè)雨滴譜參數(shù)對雷達(dá)回波強(qiáng)度的擬合曲線都大體相近，而對流云降水中，不同雨滴譜參數(shù)對雷達(dá)回波強(qiáng)度的擬合曲線差異較大。南京兩類云降水?dāng)M合的相對誤差要小于廬山兩類云降水?dāng)M合的相對誤差。除廬山對流云降水外，D_V是兩地兩類云降水?dāng)M合公式中最優(yōu)的y選項(xiàng)。而廬山對流云降水?dāng)M合式中，以N和D_P的擬合最佳。

Abstract:

At present, the correlation between radar echo intensity and rain intensity is mostly adopted in radar quantitative precipitation estimation, but radar echo intensity does not correspond to rain intensity. The radar observations and synergetic Parsivel raindrop size distribution data from Lushan and Nanjing were used to establish the functional relations between radar echo intensity and various raindrop size distribution parameters. At the same time, the radar echo intensities fitted by the determinate functional relations were compared to the real radar echo intensities in order to check the rationality of the assumed functional relations. And the optimal option about y in the functional relation was obtained by comparing the fitting relative errors of two types of clouds precipitation in two places. All the work above is done to find a new approach for radar quantitative precipitation estimation. The results prove that the fitting of raindrop size distribution parameters of two types of clouds precipitation in Lushan and Nanjing to radar echo intensity is generally good, and the fitting of convective cloud precipitation is significantly better than that of stratiform cloud precipitation. The fitting curve of each raindrop size distribution parameter to radar echo intensity in the stratiform cloud precipitation is roughly similar, but those fitting curves in the convective cloud precipitation are quite different in two places. The relative errors fitted by two types of clouds precipitation in Nanjing are smaller than those in Lushan. Except for convective cloud precipitation in Lushan, D_V is the optimal option about y in the fitting formulas of two types of clouds precipitation in two places. And the fitting of N and D_P is the best in the fitting formula of convective cloud precipitation in Lushan.

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張歡,濮江平,苑海燕,劉廣超.雷達(dá)回波強(qiáng)度與雨滴譜參數(shù)的相關(guān)性研究.氣象科學(xué),2017,37(6):797-807 ZHANG Huan, PU Jiangping, YUAN Haiyan, LIU Guangchao. The correlation research between radar echo intensity and characteristic of raindrop size distribution. Journal of the Meteorological Sciences,2017,37(6):797-807

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收稿日期:2016-08-10
最后修改日期:2016-10-13
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在線發(fā)布日期: 2018-02-10
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