河北省雙線偏振雷達(dá)數(shù)據(jù)質(zhì)量分析和衰減訂正

doi:10.12306/2020jms.0018

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河北省雙線偏振雷達(dá)數(shù)據(jù)質(zhì)量分析和衰減訂正
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                        10.12306/2020jms.0018
                    
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中圖分類號:P412.25
基金項(xiàng)目:河北省氣象局科研開發(fā)項(xiàng)目(17ky13);河北省氣象局科研開發(fā)項(xiàng)目(18ky19)

Data quality analysis and attenuation correction of dual-linear polarimetric radar in Hebei

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選取河北邢臺X波段雙線偏振全固態(tài)多普勒雷達(dá)觀測到的典型降水過程資料,分析了偏振參量的數(shù)據(jù)質(zhì)量及系統(tǒng)穩(wěn)定性,用Φ_DP對Z_H和Z_DR進(jìn)行了初步的衰減訂正,并對訂正結(jié)果進(jìn)行了評估。結(jié)果表明,724XSP雙偏振雷達(dá)初始相位Φ_DP(0)隨仰角、方位的變化都是較為穩(wěn)定的,波動較小。分析垂直掃描數(shù)據(jù),發(fā)現(xiàn)Z_DR和CC能較好地反映降水粒子的實(shí)際情況。信噪比是影響偏振數(shù)據(jù)質(zhì)量的重要因素,當(dāng)信躁比大于15 dB時,Z_DR、CC隨信噪比變化比較平穩(wěn),數(shù)據(jù)質(zhì)量可信度較高。雙偏振雷達(dá)反射率因子衰減訂正后與S波段雷達(dá)的擬合效果更好,相關(guān)系數(shù)為0.78,訂正后Z_DR-Z_H散點(diǎn)分布更接近散射模式計(jì)算出的理論結(jié)果,說明訂正效果好。

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Based on the typical precipitation process data observed by an X-band dual-linear polarimetric all-solid-state doppler radar in Xingtai, the data quality and system stability of polarization parameters were analyzed. Then, the attenuation of Z_H and Z_DR were preliminarily corrected via Φ_DP, and the corrected results were evaluated. Results indicate that the initial phase Φ_DP(0) of 724XSP dual-linear polarization radar along with the change of elevation angle and azimuth are relatively stable. The analysis of vertical scanning data indicates that Z_DR and CC can better reflect the actual situation of precipitation particles. Signal-to-Noise Ratio (SNR) is an important factor that affects the quality of polarization radar data. When SNR reaches 15.0 dB or above, Z_DR and CC change smoothly with SNR, and the radar data is credible. The attenuation correction result of dual polarization radar reflectivity factor is more similar to S-band radar. The correlation coefficient R is 0.78 and the distribution of Z_DR-Z_H scatter points is closer to the theoretical results calculated by the scattering model after correction, indicating a good correction effect.

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范根昌,樊嶸,王梧熠.河北省雙線偏振雷達(dá)數(shù)據(jù)質(zhì)量分析和衰減訂正.氣象科學(xué),2021,41(2):278-284 FAN Genchang, FAN Rong, WANG Wuyi. Data quality analysis and attenuation correction of dual-linear polarimetric radar in Hebei. Journal of the Meteorological Sciences,2021,41(2):278-284

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收稿日期:2019-09-11
最后修改日期:2020-03-25
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在線發(fā)布日期: 2021-05-14
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