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• W4213312397 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> 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 and the lower troposphere are compared with those from CDLs. To ensure the quality of the measurement data from CDLs 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 Level 2B (L2B) Mie-cloudy HLOS wind and Rayleigh-clear HLOS wind and CDL-produced HLOS wind 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 mean absolute deviation (MAD) and the bias are 0.83, 3.15 m s<span class=inline-formula>^−1</span>, 2.64 m s<span class=inline-formula>^−1</span> and <span class=inline-formula>−</span>0.25 m s<span class=inline-formula>^−1</span>, respectively, while the <span class=inline-formula><i>y</i>=<i>a</i><i>x</i></span> slope, the <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M6 display=inline overflow=scroll dspmath=mathml><mrow><mi>y</mi><mo>=</mo><mi>a</mi><mi>x</mi><mo>+</mo><mi>b</mi></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=52pt height=12pt class=svg-formula dspmath=mathimg md5hash=eaaf1dfb88885ecfa7abc591e6776d66><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-131-2022-ie00001.svg width=52pt height=12pt src=amt-15-131-2022-ie00001.png/></svg:svg></span></span> slope and the <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M7 display=inline overflow=scroll dspmath=mathml><mrow><mi>y</mi><mo>=</mo><mi>a</mi><mi>x</mi><mo>+</mo><mi>b</mi></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=52pt height=12pt class=svg-formula dspmath=mathimg md5hash=35ec51d060c1596b28c5fdda1e9ede74><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-131-2022-ie00002.svg width=52pt height=12pt src=amt-15-131-2022-ie00002.png/></svg:svg></span></span> intercept are 0.93, 0.92 and <span class=inline-formula>−</span>0.33 m s<span class=inline-formula>^−1</span>. 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<span class=inline-formula>^−1</span>, 5.77 m s<span class=inline-formula>^−1</span> and <span class=inline-formula>−</span>1.15 m s<span class=inline-formula>^−1</span>, respectively, while the <span class=inline-formula><i>y</i>=<i>a</i><i>x</i></span> slope, the <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M15 display=inline overflow=scroll dspmath=mathml><mrow><mi>y</mi><mo>=</mo><mi>a</mi><mi>x</mi><mo>+</mo><mi>b</mi></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=52pt height=12pt class=svg-formula dspmath=mathimg md5hash=fe327865feb41c58685abf31bdaf4c42><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-131-2022-ie00003.svg width=52pt height=12pt src=amt-15-131-2022-ie00003.png/></svg:svg></span></span> slope and the <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M16 display=inline overflow=scroll dspmath=mathml><mrow><mi>y</mi><mo>=</mo><mi>a</mi><mi>x</mi><mo>+</mo><mi>b</mi></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=52pt height=12pt class=svg-formula dspmath=mathimg md5hash=be55bac1518005f23d03b35937a76eaa><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-131-2022-ie00004.svg width=52pt height=12pt src=amt-15-131-2022-ie00004.png/></svg:svg></span></span> intercept are 1.00, 0.96 and <span class=inline-formula>−</span>1.2 m s<span class=inline-formula>^−1</span>. It is found that the standard deviation, the scaled MAD and the bias on ascending tracks are lower than those 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 and 08, Baselines 09 and 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 and 08 and wind data from CDLs in the atmospheric boundary layer and the lower troposphere are found. With the continuous calibration and validation and product processor updates, the performances of Aeolus wind measurements under Baselines 09 and 10 and Baseline 11 are improved significantly. Considering the influence of turbulence and convection in the atmospheric boundary layers and the lower troposphere, higher values for the vertical velocity are common in this region.<span id=page132/> Hence, as a special note, the vertical velocity could impact the HLOS wind velocity retrieval from Aeolus." @default.
• W4213312397 created "2022-02-24" @default.
• W4213312397 date "2021-09-06" @default.
• W4213312397 modified "2023-10-01" @default.
• W4213312397 title "Comment on amt-2021-260" @default.
• W4213312397 doi "https://doi.org/10.5194/amt-2021-260-rc1" @default.
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