沿海岛屿数据用于蒸发波导分析的低可信度

Low Reliability of Applying Offshore Data to Analyze Evaporation Duct

在我国沿海海域,没有大量的气象浮标,但在岛屿或海边有大量的气象观测站,能否利用这些气象观测站获得的数据进行蒸发波导特性分析,值得深入研究。对比沿海岛屿实测数据与NCEP再分析数据,并将这两种数据输入NPS模型后发现蒸发波导高度的差异较大。但是对比气象浮标数据与NCEP数据,表明NCEP再分析数据用于蒸发波导统计分析是可信的,从而得出结论:沿海岛屿测量数据应用于蒸发波导统计特性研究的可信度较低。理论分析表明:成因是海陆交互作用的影响。但其气象参数的变化趋势与NCEP再分析数据的变化趋势比较一致,对于蒸发波导强弱和变化趋势的判定,仍有一定参考价值。

The ocean evaporation duct phenomenon has a vital influence on the propagation of electromagnetic wave. Statistical properties of evaporation duct in a large scale sea area have a great significance for radar and communication systems. In this paper, 3 kinds of meteorological data were used to study the statistical properties of evaporation duct over coastal waters, including meteorological buoy data, NCEP reanalysis data and actual measured data from coastal islands. The data measured from coastal islands were compared with the NCEP re- analyzed data. Then, the evaporation duct heights were calculated from these two kinds of data by using NPS model and the differences of the result were obvious. Furthermore, in contrast with the meteorological buoy data, the NCEP re-analyzed data used to study the evaporation duct features was reliable. It could be concluded that the reliability of the application of offshore islands measurements in evaporation duct statistical properties study was low. But the meteorological buoy data had a similar raring trend with the NCEP re-analyzed data, that could be helpful on judging the intension of evaporation duct.