蒸发波导数据库及中国海域的统计分析

Evaporation duct database and statistical analysis for the Chinese sea areas

海上蒸发波导高度的统计特征对于海上无线电系统的设计和运行具有重要意义.为了准确描述蒸发波导高度的全球分布特征,利用海洋-大气耦合响应试验最新发展的近海面湍流通量计算方法,对美国海军研究生院提出的蒸发波导模型进行了改进,然后基于美国环境预报中心提供的最新12年再分析数据,建立了全球海域不同月份,空间分辨率为1°×1°的蒸发波导高度数据库,并对中国近海蒸发波导的时空分布特征和成因进行了重点分析.所得结果对于海上雷达、通信、导航等无线电系统的设计与应用具有参考价值.

The statistical characteristic parameters of marine evaporation duct height over the world ocean areas are important for marine electromagnetic system design studies and operational planning. In order to give more accurate depiction of evaporation duct height over the world ocean, the database of evaporation duct heights in the world seas with spatial resolution of about 1°× 1°is found using the National Centers for Environmental Prediction （NCEP） reanalysis data, from 2000 to 2011, and an improved evaporation duct model, which was found originally by America naval postgraduate school, and improved using version 3.0 of the coupled ocean atmosphere response experiment （COARE） bulk algorithm. With the database, the spatio-temporal features of evaporation duct heights in China for different seas and months are studied, also its generation mechanism is discussed. The results are important for radar, communication, navigational fixing system design and operational planning.