| 摘要: |
| 采用经验正交函数(EOF)分解、超前滞后相关分析等方法, 分析了36°N 断面、大连—成山头断面和渤海中部断面盐度的空间分布特征和时间变化特征, 讨论了环黄、渤海海洋站之间盐度的关系。结果表明, 36°N 断面、大连—成山头断面和渤海中部断面盐度的整体趋势都是升高, 黄河流量的减小是造成渤海盐度升高的重要原因。黄海千里岩站1960～2000 年间的盐度整体趋势也是升高, 年变化率为0.01/a, 造成盐度升高的主要原因是降水的减少, 并且其短期震荡可能和El Ni?o 有关, 长期变化则与太平洋年代际震荡(PDO)有关。此外, 千里岩站和其他海洋站之间的盐度有较好的正相关关系, 只是在时间上存在着1～3 个月的超前。对黄、渤海盐度长期变化的系统分析表明, 近海盐度可能受到外洋的影响, 有助于加深对中国近海环境演变的认识。 |
| 关键词: 黄海 渤海 盐度 变化趋势 |
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| 基金项目:国家重点基础研究发展计划项目(2005CB422302); 国家自然科学基金项目(40930844); 国家科技支撑计划项目(2008BAC49B02) |
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| The spatial distribution and temporal evolution of salinity at the sections and observation stations in the Yellow Sea and Bohai Sea |
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MA Chao,JU Xia,WU De-xing,LIN Xiao-pei,SUN Ke
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| Abstract: |
| Empirical Orthogonal Function (EOF) analysis and lagging correlation analysis were adopted to analyze the spatial distribution and temporal evolution of salinity at the 36°N section, Dalian-Chengshantou section and central Bohai section, and to describe the relationship among the observation stations around the Yellow Sea and Bohai Sea. The conclusion is that the salinity at Qianliyan station in the Yellow Sea increased during the period of 1960～2000 with an annual rate of 0.01/a, and it was probably caused by the decrease of precipitation. The short-term oscillation of the salinity might related to the El Ni?o, while the long-term variation related to the Pacific Decal Oscillation (PDO). Besides, there were positive correlations between the salinity at Qianliyan and other stations, and the only difference was a temporal lead of 1～3 months. This study systematically analyzed the long term variation of the salinity in the Yellow and Bohai Seas, and showed that the salinity in coastal sea might be affected by the open ocean, which is helpful to understand the evolution of marine environment in the China coastal sea. |
| Key words: the Yellow Sea, the Bohai Sea, salinity, variation |
