海上蒸发波导模式研究进展及面临的问题

对流层中电磁波的反常传播可以导致错误的气象雷达测量,海洋上最常出现的反常传播现象是蒸发波导.本文重点介绍了迄今为止有重要影响的3个蒸发波导模式,美国的PJ模式、欧洲的MGB模式和最近发展的Babin模式.所有蒸发波导模式都是以莫宁-奥布霍夫(Monin-Obukhov)相似理论为基础,但是这些模式在相似理论应用上显著不同.通过相同条件下的对比实验表明,Babin模式使用了最近精确的整体相似表达式,并采用了小风速相似理论拓展技术和湿度的盐度订正技术,结果优于PJ模式和MGB模式.

ADVANCES AND QUESTIONS IN THE MODEL STUDY OF EVAPORATION DUCT OVER OCEAN

Anomalous propagation of electromagnetic radiation in the troposphere may result in erroneous meteorological radar measurements. The most commonly occurring anomalous propagation phenomenon over the ocean is the evaporation duct. U. S.model (PJ), European model (MGB) and recently developed Babin model are described in this paper. All of These models are based on Monin-Obukhov similarity theory. However, these models differ significantly in the way this theory is applied. Comparison of these models is made in the same condition and results shown that Babin model uses recently refined bulk similarity expressions, the salinity correction techniques to calculate saturation water vapor pressures and to extend the validity of Monin-Obukhov theory to low wind speeds, it is superior to the other models.