An investigation of the moving-frame single-Doppler wind retrieval technique using Taiwan Area Mesoscale Experiment low-level data
An investigation of the moving-frame single-Doppler wind retrieval technique using Taiwan Area Mesoscale Experiment low-level data
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台湾地区中尺度实验低层资料动框单多普勒风反演技术研究
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Ing
中科院分区：
文献类型：
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作者：
Yu‐Chieng Liou;Ing
摘要利用1987年台湾地区中尺度试验密集观测期2的实测资料，研究了移动框架单多普勒雷达风反演技术。重点是研究雷达几何位置对检索质量的影响。实验表明，该技术能够恢复缺失的横梁风分量，但其大小往往被低估。因此，当未观测到的切向分量小于可观测到的径向分量时，产生的结果最好。相反，如果未知的横波束风由于与雷达观测点的不利关系而大大超过径向风，则反演结果就不太可靠。然而，即使没有对真实流动结构的先验知识（现实中总是如此），这种单多普勒检索方案也证明了其区分径向或方位角哪个分量更大的能力。换句话说，当切向分量完全支配径向风时，该信息可以通过检索算法正确传递，提醒用户，以便雷达数据和这些单多普勒检索结果将被谨慎解释和使用。
The moving-frame single-Doppler radar wind retrieval technique is investigated using field experimental data observed during the 1987 Taiwan Area Mesoscale Experiment intensive observation period 2. Emphasis is placed on studying the impact of the geometric position of the radar in relation to the quality of the retrievals. Experiments show that this technique is capable of recovering the missing cross-beam wind components, but their magnitude is always underestimated. As a consequence, when the unobserved tangential components are smaller than the observable radial components, the best results are produced. By contrast, if the unknown cross-beam winds considerably exceed the radial winds because of a disadvantageous relationship to the radar observation site, the retrievals become less reliable. However, even without a priori knowledge of the true flow structure, which is always the case in reality, this single-Doppler retrieval scheme demonstrates its ability to distinguish which component (radial or azimuthal) is greater. In other words, when the tangential component completely dominates the radial winds, this message can be correctly delivered through the retrieval algorithm to alert the users so that the radar data and these single-Doppler-retrieved results will be interpreted and used with caution.