雙頻毫米波雷達反演云微物理參數(shù)的模擬研究

doi:10.12306/2021jms.0037

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雙頻毫米波雷達反演云微物理參數(shù)的模擬研究
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                        10.12306/2021jms.0037
                    
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中圖分類號:412.25
基金項目:國家重點研發(fā)計劃項目(2018YFC1506100;2018YFC1506102);江蘇省氣象局科研專項(KZ201905)

Simulation research on the retrieval of cloud microphysical parameters by dual frequency millimeter wave radar

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摘要:

根據(jù)雷達探測的云回波雷達反射率因子和多普勒速度,利用兩種獨立的雙頻反演算法,估算了云微物理參數(shù)。利用離散偶極子近似(Discrete Dipole Approximation,DDA)計算了云滴后向散射截面和衰減截面,根據(jù)模擬數(shù)據(jù)實驗了三種頻段組合的反演結(jié)果,探討算法對滴譜參數(shù)、粒子形狀的敏感性,比較兩種方法反演水云和冰云的優(yōu)劣。結(jié)果表明:雙頻比(Dual-Frequency Ratio, DFR)和多普勒速度差(Doppler Difference of Velocity, DDV)在水云中都可獨立推導中值直徑(D₀),但在高頻波段,基于DFR的算法對雨、云水和水汽的衰減非常敏感,而基于DDV的方法受衰減的影響較小。鑒于高頻波段衰減完全訂正的困難性,水云的DDV反演方法比DFR更直接準確。對于冰云,DFR的技術(shù)相較于DDV的方法具有明顯的優(yōu)勢,因為兩頻段處的DFR在冰云中的動態(tài)范圍更大,而DDV的動態(tài)范圍相對于系統(tǒng)和測量誤差較小。

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Two independent dual-frequency retrieval algorithms were used to estimate the cloud microphysical parameters based on the radar reflectivity factor and Doppler velocity measurements of the cloud echo detected by the radar. The backscattering section and attenuation section of the cloud droplets were calculated by Discrete Dipole Approximation(DDA). The retrieval results of the three frequency band combinations experimentally simulated by using simulated data. The sensitivity of the algorithm to the parameters of the droplets and the shape of the particles were discussed. The advantages and disadvantages were compared of water cloud and the ice cloud in two ways. Dual-Frequency Ratio(DFR) and Doppler Difference of Velocity(DDV) techniques can independently derive the median volume diameter of the particle (D₀)in water clouds, but in the high frequency band, DFR-based algorithms are seriously sensitive to the attenuation of rain, cloud water and water vapor, while DDV-based methods are less affected by attenuation. In view of the difficulty of completely correcting the attenuation of the high frequency band, the DDV retrieval of the water cloud is more direct and accurate than the DFR method. For ice clouds, DFR techniques have significant advantages over DDV methods because the DFR dynamic range is greater in dual-frequency, and DDV is small relative to the system and measurement error.

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楊敏,黃興友,趙泉欽,張正,楊恒祥,周紅根.雙頻毫米波雷達反演云微物理參數(shù)的模擬研究.氣象科學,2022,42(1):12-23 YANG Min, HUANG Xingyou, ZHAO Quanqin, ZHANG Zheng, YANG Hengxiang, ZHOU Honggen. Simulation research on the retrieval of cloud microphysical parameters by dual frequency millimeter wave radar. Journal of the Meteorological Sciences,2022,42(1):12-23

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收稿日期:2020-10-22
最后修改日期:2021-03-19
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在線發(fā)布日期: 2022-06-01
出版日期: 2022-05-30

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