Measurement of wind profiles by motion-stabilised ship-borne Doppler lidar
Measurement of wind profiles by motion-stabilised ship-borne Doppler lidar
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DOI：
10.5194/amt-8-4993-2015
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发表时间：
2015-11
影响因子：
3.8
通讯作者：
P. Achtert;I. Brooks;B. Brooks;B. Moat;J. Prytherch;P. Persson;M. Tjernström
中科院分区：
文献类型：
--
作者：
P. Achtert;I. Brooks;B. Brooks;B. Moat;J. Prytherch;P. Persson;M. Tjernström
抽象的。 2014 年夏天，在破冰船 Oden 上进行的北极云夏季实验中获得了三个月的多普勒激光雷达风测量结果。此类船载多普勒测量需要主动稳定以消除船舶运动的影响。我们证明，将商用多普勒激光雷达与定制的运动稳定平台相结合，能够在巡航和破冰过程中检索北极大气边界层的风廓线，其统计不确定性与陆基测量相当。尽管总体气溶胶负荷非常低，但在大气边界层内尤其如此。对于开放水域的高风速和由此产生的波浪条件，运动稳定是成功的。它允许检索随机误差低于 0.2 m s−1 的垂直风。激光雷达测量的风和无线电探测的比较得出风速（风向）的平均偏差为 0.3 m s−1 (2°)，平均标准偏差为 1.1 m s−1 (12°)。风向一致性随着高度的增加而降低。运动稳定平台与低维护自主多普勒激光雷达的结合有可能实现海洋上空连续长期高分辨率船基风廓线测量。
Abstract. Three months of Doppler lidar wind measurements were obtained during the Arctic Cloud Summer Experiment on the icebreaker Oden during the summer of 2014. Such ship-borne Doppler measurements require active stabilisation to remove the effects of ship motion. We demonstrate that the combination of a commercial Doppler lidar with a custom-made motion-stabilisation platform enables the retrieval of wind profiles in the Arctic atmospheric boundary layer during both cruising and ice-breaking with statistical uncertainties comparable to land-based measurements. This held true particularly within the atmospheric boundary layer even though the overall aerosol load was very low. Motion stabilisation was successful for high wind speeds in open water and the resulting wave conditions. It allows for the retrieval of vertical winds with a random error below 0.2 m s−1. The comparison of lidar-measured wind and radio soundings gives a mean bias of 0.3 m s−1 (2°) and a mean standard deviation of 1.1 m s−1 (12°) for wind speed (wind direction). The agreement for wind direction degrades with height. The combination of a motion-stabilised platform with a low-maintenance autonomous Doppler lidar has the potential to enable continuous long-term high-resolution ship-based wind profile measurements over the oceans.