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Inter-comparison of wind measurements in the atmospheric boundary layer with Aeolus and a ground-based coherent Doppler lidar network over China
Atmospheric Measurement Techniques ( IF 3.2 ) Pub Date : 2021-08-27 , DOI: 10.5194/amt-2021-260 Songhua Wu , Kangwen Sun , Guangyao Dai , Xiaoye Wang , Xiaoying Liu , Bingyi Liu , Xiaoquan Song , Oliver Reitebuch , Rongzhong Li , Jiaping Yin , Xitao Wang
Atmospheric Measurement Techniques ( IF 3.2 ) Pub Date : 2021-08-27 , DOI: 10.5194/amt-2021-260 Songhua Wu , Kangwen Sun , Guangyao Dai , Xiaoye Wang , Xiaoying Liu , Bingyi Liu , Xiaoquan Song , Oliver Reitebuch , Rongzhong Li , Jiaping Yin , Xitao Wang
Abstract. After the successful launch of Aeolus which is the first spaceborne wind lidar developed by the European Space Agency (ESA) on 22 August 2018, we deployed several ground-based coherent Doppler wind lidars (CDLs) to verify the wind observations from Aeolus. By the simultaneous wind measurements with CDLs at 17 stations over China, the Rayleigh-clear and Mie-cloudy horizontal-line-of-sight (HLOS) wind velocities from Aeolus in the atmospheric boundary layer are compared with that from CDLs. To ensure the quality of the measurement data from CDL and Aeolus, strict quality controls are applied in this study. Overall, 52 simultaneous Mie-cloudy comparison pairs and 387 Rayleigh-clear comparison pairs from this campaign are acquired. All of the Aeolus-produced L2B Mie-cloudy HLOS, Rayleigh-clear HLOS and CDL-produced HLOS are compared individually. For the inter-comparison result of Mie-cloudy HLOS wind and CDL-produced HLOS wind, the correlation coefficient, the standard deviation, the scaled MAD and the bias are 0.83, 3.15 m/s, 2.64 m/s and −0.25 m/s respectively, while the "y = ax" slope, the "y = ax + b" slope and the "y = ax + b" intercept are 0.93, 0.92 and −0.33 m/s. For the Rayleigh-clear HLOS wind, the correlation coefficient, the standard deviation, the scaled MAD and the bias are 0.62, 7.07 m/s, 5.77 m/s and −1.15 m/s respectively, while the "y = ax" slope, the "y = ax + b" slope and the "y = ax + b" intercept are 1.00, 0.96 and −1.2 m/s. It is found that the standard deviation, the scaled MAD and the bias on ascending tracks are slightly better than that on descending tracks. Moreover, to evaluate the accuracy of Aeolus HLOS wind measurements under different product baselines, the Aeolus L2B Mie-cloudy HLOS wind data and L2B Rayleigh-clear HLOS wind data under Baselines 07/08, Baselines 09/10, and Baseline 11 are compared against the CDL-retrieved HLOS wind data separately. From the comparison results, marked misfits between the wind data from Aeolus Baselines 07/08 and wind data from CDL in planetary boundary layer are found. With the continuous calibration and validation and product processor updates, the performances of Aeolus wind measurements under Baselines 09/10 and Baseline 11 are improved significantly. Considering the influence of turbulence and convection in the planetary boundary layers, higher values for the vertical velocity are common in this region. Hence, as a special note, the vertical velocity could impact the HLOS wind velocity retrieval from Aeolus.
更新日期：2021-08-27
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