基于觀測系統(tǒng)模擬試驗的雙雷達風(fēng)場反演算法評估

doi:10.12306/2024jms.0016

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基于觀測系統(tǒng)模擬試驗的雙雷達風(fēng)場反演算法評估
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                        10.12306/2024jms.0016
                    
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中圖分類號:P412.25
基金項目:海南省南海氣象防災(zāi)減災(zāi)重點實驗室開發(fā)基金資助項目(SCSF202202)

Evaluation of dual-Doppler radar wind retrieval methods based on observation system simulation experiment

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本文利用新一代中尺度數(shù)值模式(Weather Research and Forecasting model，WRF)模擬了一次強對流天氣過程，開展了基于觀測系統(tǒng)模擬試驗(Observation System Simulation Experiment，OSSE)的雙雷達風(fēng)場反演效果試驗研究。基于WRF模式輸出的三維風(fēng)場，模擬兩部多普勒雷達的體掃數(shù)據(jù)，再利用迭代法和變分法進行三維風(fēng)場反演，將模式輸出場作為真實風(fēng)場，定量計算反演風(fēng)場的風(fēng)速誤差，結(jié)合典型強對流個例的發(fā)生、發(fā)展過程，分析不同算法反演風(fēng)場的散度、渦度和垂直速度等特征。結(jié)果表明，兩種算法反演獲得的風(fēng)場結(jié)構(gòu)與強對流天氣過程的基本特征一致，變分法能更準(zhǔn)確地反演出強對流天氣過程的垂直速度、散度和渦度場，而迭代法反演的結(jié)構(gòu)特征不明顯，且強度明顯偏弱。

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The accuracy and error characteristics of two dual-Doppler radar wind retrieval methods were evaluated by using Observation System Simulation Experiment (OSSE). A severe convective storm was simulated by the Weather Research and Forecasting model (WRF), and the model wind field was used as the true value to quantitatively calculate the errors of the retrieved wind field. Volumetric scans of reflectivity and radial velocity similar to operational radars were generated from the WRF output by placing virtual radars at different locations within the WRF domain. Three-dimensional wind fields were then retrieved from the simulated radar scans by the iterative and variational methods. The speed, divergence, vorticity, and vertical velocity fields in the retrieved wind were compared with the true wind at different periods of the lifecycle of the simulated convective storm. Results show that both methods were able to recover the basic characteristics of the wind fields. The variational method was able to better recover the vertical velocity, divergence, and vorticity fields of the convective storm, while those retrieved from the iterative method were either absent or too weak.

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羅銳瑩,唐曉文,鄭艷.基于觀測系統(tǒng)模擬試驗的雙雷達風(fēng)場反演算法評估.氣象科學(xué),2025,45(4):560-571 LUO Ruiying, TANG Xiaowen, ZHENG Yan. Evaluation of dual-Doppler radar wind retrieval methods based on observation system simulation experiment. Journal of the Meteorological Sciences,2025,45(4):560-571

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收稿日期:2023-12-26
最后修改日期:2024-02-01
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在線發(fā)布日期: 2025-11-29
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