Capture of a strong elevated ducting event, especially its maintenance and sudden change, is of great value to airborne radar to achieve its beyond-the-line-of-sight detection. However, the knowledge is not easily accessible over the open ocean and hence very rare. During the Air-Sea Interaction Survey (ASIS) over the western North Pacific (WNP) in May 2016, a strong elevated ducting event with a long-life period and sudden change in its evolution was observed. Measurements from the ASIS, images from the Himawari-8 satellite, reanalysis data from the ECMWF, and Weather Research and Forecasting (WRF) model, were used to analyze the maintenance and sudden change of this strong ducting event, together with the model performance on simulating it. The results showed that the maintenance of strong elevated ducts, with their tops ranging from 750 to 1050 m and average strength of approximately 38 M units, was caused by a strong dry air mass capping over the wet marine atmospheric boundary layer (MABL), together with the subsidence inversion associated with high pressure. The WRF model performs well in simulating them. However, a sudden increase in duct height with a slight decrease of strength was recorded by the subsequent GPS radiosonde, which was finally contributed to the mechanical turbulent inversion and hydrolapse associated with the marine low-level jet (MLLJ). The height of the maximum horizontal wind speed (U_mh) of the MLLJ corresponds well with the bottom of the trapping layer. However, these jet-relevant ducts are generally weak and it is difficult to accurately simulate them by using the mesoscale numerical model, since the wind-shear produced eddies are too small to be properly parameterized.

捕获强力的高架管道事件，尤其是其维护和突然变化，对于机载雷达实现其超视距检测具有重要价值。但是，在公开海洋上不容易获得知识，因此非常罕见。在2016年5月对北太平洋西部（WNP）进行的海海相互作用调查（ASIS）中，观察到强烈的高架管道事件，具有较长的生命周期，并且演化过程突然发生变化。来自ASIS的测量，来自Himawari-8的图像卫星，来自ECMWF的再分析数据以及天气研究与预报（WRF）模型，被用于分析这种强风管事件的维护和突然变化，以及在模拟过程中的模型性能。结果表明，对高强度风管的维护（其顶部范围从750至1050 m，平均强度约为38 M单位）是由湿海洋大气边界层（MABL）上强大的干空气质量上限引起的。伴随着与高压相关的沉陷反演。WRF模型在模拟它们方面表现良好。但是，随后的GPS无线电探空仪记录到导管高度突然增加而强度略有下降，最终促成与海洋低空急流（MLLJ）相关的机械湍流反演和水流崩塌。最大水平风速高度（MLLJ的U _mh）与陷获层的底部很好地对应。但是，这些与射流有关的导管通常较弱，并且由于风切变涡流太小而无法正确地进行参数化，因此难以通过使用中尺度数值模型对其进行精确模拟。