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基于ECMWF数据的中国近海及邻近海域 低空波导气候学研究
成印河
江苏海洋大学测绘与海洋信息学院
摘要:
基于1988-2017年高分辨率的欧洲中尺度天气预报中心再分析数据,对中国近海及邻近海域低空大气波导进行了统计分析。结果表明:该海域整体大气波导概率为22.0%,悬空波导占比60%以上;大气波导最容易发生在春季,其次是夏季、秋季和冬季。区域时空分布上,中国近海及邻近海域大气波导具有明显的月变化和区域分布特征。大气波导概率北方渤海、黄海、东海及邻近海域发展变化较大,南方变化较小。波导底高南方高,北方低,靠近大陆沿岸东侧海域、岛屿西侧海域低,外海较高,这与主导波导类型密切相关。波导厚度和强度均呈现出明显半年度的震荡,冬、春季节波导厚度具有‘北低南高’,强度‘北弱南强’分布特征,夏、秋季节具有‘北厚南薄’,强度‘北强南弱’地理分布特征。该结论可以充实我国大气波导数据库建设,为海上雷达探测、通信等提供环境支撑。
关键词:  中国近海  ECMWF  大气波导  气候学
DOI:10.11693/hyhz20200500139
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Duct climatology over the China seas and vicinity based on ECMWF reanalysis data
CHENG Yin-He
520000
Abstract:
Based on the European Centre for Medium-Range Weather Forecast (ECMWF) reanalysis data with a high resolution from 1988 to 2017, the climatologic characteristics of atmospheric duct over the China seas and vicinity were statistically analyzed. The results show that the mean ducting probability in this region is 22.0%, and more than 60% are the elevated ducts. On seasonal variation, atmospheric ducts are most likely to occur in spring, followed by summer, autumn and winter. On spatial and temporal distribution, the regional distribution of the ducts over the China seas and vicinity has distinctive monthly variation trend. The ducting probability for the north region including the Bohai gulf,the Yellow sea and the East sea develops and changes larger than for the south region including the he South China Sea (SCS) . The distribution of the duct-bottom heights has an increasing trend from north to south, and they are usually lower near the coast of the east main land and west islands and higher in the open sea far away from the main land, which is closely associated with controlling duct types. The distribution of the duct thickness and strength expresses a semi-annual oscillation and similar geographical distribution characteristics. The duct thickness and strength in the north region generally larger than in the south region in winter and spring seasons and reverse in summer and autumn seasons. The research results not only enrich the duct database of the China but also provide environment support for radar detection and communication over the sea.
Key words:  China seas and vicinity  ECMWF  atmospheric duct  climatology
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