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本文的目的旨在研究南海全年皆夏的海区是否终年如一，有无季节性差别，根据南海季风显著、台风频繁的特点，在分析中国近海季风和热带气旋活动的统计特征的基础上，通过实例分析了季风和热带气旋对南海水文特征和季节结构的显著影响，认为南海的全夏海区，虽全年皆夏，但并非终年如一．根据冬、夏季风各个发展阶段的标志日期和台风频率的季节性特征，南海全夏海区的水文季节结构可分为孟夏、仲夏、盛夏和晚夏四个时期，并对各个时期的具体划分和水文的季节性特征作了论述．
The purpose of this paper is to study whether the sea area in summer in the South China Sea is all year round with or without seasonal differences. According to the statistical characteristics of monsoon and tropical cyclone activities in China’s coastal areas based on the significant monsoon in the South China Sea and frequent typhoons, The case study analyzes the significant influence of monsoon and tropical cyclone on the hydrological characteristics and seasonal structure of the South China Sea. It is concluded that the whole summer sea area in the South China Sea, though all summer, is not an annual one. According to the seasonal signatures of the typhoon frequency and the sign dates of the winter and summer monsoon stages, the hydrological seasonal structure of the whole summer sea area in the South China Sea can be divided into four periods: Mengxia, Midsummer, Midsummer and Late Summer. The specific division of each period and The seasonal characteristics of hydrology are discussed.