Bias estimation of Doppler‐radar radial‐wind observations
Bias estimation of Doppler‐radar radial‐wind observations
复制标题
多普勒雷达径向风观测的偏差估计
DOI：
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复制
发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Niemelä
中科院分区：
文献类型：
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作者：
K. Salonen;H. Järvinen;R. Eresmaa;S. Niemelä
多普勒雷达提供高空间和时间分辨率的雷达径向风分量的测量。变分数据同化框架允许在数值天气预报模式中直接使用这些测量值。由于方位扫描策略，需要特别注意对多普勒雷达径向风的偏差估计。即使在测量和模拟的风速和风向之间存在系统差异的情况下，计算所有方位方向的偏差统计也会产生接近于零的值。本文介绍了一种多普勒雷达径向风场观测的偏差估计方法。对多普勒雷达和无线电探空仪测风估计偏差的相互比较表明，风速和风向偏差具有相当的量级。版权所有(C)2007皇家气象学会
Doppler radars provide measurements of the radar radial wind component at high spatial and temporal resolution. The variational data‐assimilation framework enables direct use of these measurements in numerical weather prediction models. Bias estimation of Doppler‐radar radial winds requires special attention because of the azimuthal scanning strategy. Calculation of the bias statistic over all azimuthal directions results in a near‐zero value even in the presence of systematic differences between the measured and modelled wind speed and direction. This paper describes a method for bias estimation of Doppler‐radar radial‐wind observations. Intercomparison between the estimated biases of Doppler‐radar and radiosonde wind observations reveals that the wind speed and direction biases are of comparable magnitude. Copyright © 2007 Royal Meteorological Society