南海中部海域障碍层特征及其形成机制

潘爱军; 万小芳; 许金电; 郭小钢; 吴日升

南海中部海域障碍层特征及其形成机制

国家海洋局第三海洋研究所, 福建, 厦门, 361005

基金项目: 福建省自然科学基金计划资助项目(Z0515010);科技部国际合作重点项目(2002CB714001);国家自然科学重点基金项目(40231012)

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出版历程
- 收稿日期: 2005-09-08
- 修回日期: 2006-08-13

Barrier layer in the central South China Sea and its formation mechanism

The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

摘要

摘要: 南海中部海域(10°~19°N,108°~122°E)存在显著的季节变化的障碍层.障碍层发生概率夏季最大(52.8%),秋季次之(41.0%),春季最小(10.5%).夏季(2000年8~9月)障碍层最显著,平均厚度约为14.2m;除114°E以东、吕宋岛以西海域为障碍层的多发区外,中南半岛东南海域(12°~14°N,110°~114°E)也存在显著的障碍层;春季(1998年4~6月)和秋季(1998年12月)障碍层平均厚度分别为6.8和11.2m,障碍层多位于114°E以东、吕宋岛以西海域.此外,吕宋岛以西海域(12°~16°N,116°~120°E)及中沙和西沙群岛附近(16°~18°N,110°~116°E)海域障碍层年发生几率超过20%,相对而言,其他海域障碍层年发生几率偏小.降水机制和层结机制分别是南海中部海域春、夏季和秋季障碍层形成的主要原因.其中,降水机制及东南向的Ekman平流较好的解释了春、夏季吕宋岛以西附近海域成为障碍层多发区的原因;此外,强降水是夏季中南半岛东南海域(12°~14°N,110°~114°E)障碍层产生的关键,反气旋涡(暖涡)有助于形成更强的障碍层,上升流对障碍层的影响有待进一步研究.
- 南海中部海域 /
- 障碍层 /
- 层结 /
- 降水 /
- Ekman平流 /
- 反气旋涡
Abstract: Robust evidencoes of the existence of the barrier layer (BL) in the central South China Sea (10°~19°N, 108°~122°E) are provided, which occurs most frequently in summer (52.8%),and then autumn (41.0%) and spring (10.5%).BL occurrence zone in spring (Apr.) Jun.1998) and autumn (Dec.1998) is largely confined in the adjacent ocean west of the Luzon Island, with mean thickness as 6.8 and 11.2 m, respectively.By contrast,BL occurs not only in the adjacent ocean west of the Luzon Island, but also extends to the southeast of Vietnam (12°~14°N, 110°~114°E).Its mean thickness is 14.2 m.Besides, the annual occurrence frequency of BL surpasses 20% west of Luzon Island (12°~16°N, 116°~120°E) and near the Paracel Islands (16°~18°N, 110°~116°E).Rain-formed mechanism and stratification-formed mechanism are responsible mainly for the occurrence of BL in spring-summer and autumn in central South China Sea, respectively.Among which, rain-formed mechanism and the south eastward Ekman advection explains well the occurrence of BL west of the Luzon Island in spring and summer.The strong rainfall plays the vital role in inducing the BL sout heast of Vietnam in summer, moreover, the anticyclone eddy (warm) is favorable for the occurrence of BL.
- central South China Sea /
- barrier layer /
- stratification /
- rainfall /
- Ekman advection /
- eddy

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