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1998年夏季风暴发前后南海海洋水文特征及其变异

Hydrographic characteristics and its variation of the South China Sea before and after monsoon onset in the summer of 1998

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【作者】 许建平李金洪刘增宏朱伯康

【Author】 Xu Jianping, Li Jinhong, Liu Zenghong, Zhu BokangSecond Institute of Oceanography, State Oceanic Administration , Hangzhou 310012.Key Lab of Ocean Dynamic Processes and Satellite Oceanography, State Oceanic Administration , Hangzhou, 310012.

【机构】 国家海洋局第二海洋研究所

【摘要】 文章利用1998年南海季风试验(SCSMEX)期间,在夏季风暴发(5月25日)前后实施的两个强化观测航次(IOP1:4月10日至5月5日;IOP2:6月12日至7月6日)获得的CTD和ADCP资料,分析了季风暴发前后南海上层海水温度、盐度分布特征和环流结构的差异.结果表明,在季风暴发前后,南海上层温度场有明显的改变,平均海面升温在0.75℃以上,其影响可及500 m以深水域.局地环流的相互作用使得南海上层海水温度、盐度结构复杂多变,冷、暖水区(块)相间分布.季风暴发后,次表层高盐海水明显由西北太平洋入侵南海,但仅限于台湾岛西南一隅;而中层低盐海水则由南海流入西北太平洋.南海环流场主要由多个反气旋涡(环)和气旋涡(环)组成,随着季风暴发,这些反气旋涡(环)或气旋涡(环)的强度和数量均会发生变化,呈现了复杂的分布情形和变异.根据等密度面分析法推断的南海环流与本次调查获得的实际测量(ADCP)结果十分吻合,表明南海环流形成主要受到海洋内部质量场的控制,即地转分量占优势.

【Abstract】 The differences of temperature, salinity distribution characteristics and structure of circlulation in the upper layer of the South China Sea (SCS) are analyzed, based on the CTD and ADCP data from the two intensive surveyed cruises (IOP1: April 10 to May 5; IOP2: June 12 to July 6) carried out before and after the Asian monsoon onset (May 25) during the South China Sea Experiment (SCSMEX) in the summer of 1998. The results showed that field of temperature in the upper layer of SCS distinctly changed before and after the monsoon onset, the average surface temperature increased by 0.75℃, with its influence down to the depth of 500 m. The interaction of the local circulation in some areas resulted in the complexity and variability of the temperature and salinity structure in the upper layer, and the alternating distribution of cold and warm water regions (blocks). The high salinity subsurface water obviously intruded into SCS from Northwest Pacific, but only limited to the area of southwest of Taiwan Island, and the low salinity intermediate water flowed from SCS to the Northwest Pacific. The circulation field of SCS in the summer mainly consisted of cyclonic and anticyclonic eddies (rings). With the onset of the monsoon, the intensity and amount of the anticyclonic or the cyclonic eddies (rings) would vary, showing the complex distribution patterns and variations. The result analyzed by the isopycnic surface method coincided extremely with those by in-situ survey (ADCP), which showed that the formation of circulation in SCS was mainly controlled by the internal mass field, that is, dominated by the geostrophic component.

【基金】 国家攀登计划“南海季风试验”项目;国家重点基础研究发展规划项目(G1999043805);国家海洋局的资助.
  • 【会议录名称】 中国海洋学文集——南海海流数值计算及中尺度特征研究
  • 【会议时间】2001-12
  • 【分类号】P731.2
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