南海北部跨陆架输运特征及形成机理

The continental shelf of northern South China Sea (NSCS) is one of the most active and complicated region for the global material cycle. The cross-shelf transport is a key factor for modulating this kind of the material cycle. At present, the characteristics and mechanistic understanding of the cross-shelf transport in the NSCS remain limited. In this project, the spatial structure of cross-shelf transport in the NSCS are studied by using in-situ current data and high-resolution satellite remote-sensing data. The effects on the cross-shelf transport in the NSCS from the open-ocean forcing, topography and local wind are then investigated. The characteristics and forcing mechanisms of cross-shelf transport in the NSCS under the influence of monsoon and open-ocean forcing are further elucidated, and the transport between continental shelf and open-ocean is estimated.The academic achievements of this project will help to promote the understanding of matter exchange between continental shelf and ocean, and to improve the knowledge of dynamics of the marginal sea.

南海北部陆架区是全球物质循环最为活跃和最为复杂的海域之一，跨陆架输运成为影响和控制物质过程和循环的一个十分重要因素。目前对南海北部跨陆架输运特征及形成机理认识较为不足。本项目通过对南海北部陆架区实测断面海流资料及高分辨率卫星遥感资料的综合分析，揭示夏季南海北部陆架区跨陆架输运的空间结构特征；阐明外海强迫、地形及局地风场等对跨陆架输运的影响；探讨季风和深海强迫作用下南海北部陆架的输运规律和机制，给出陆架－外海水体输送量值的探索性估算。本研究有望加深陆架-大洋之间物质运输关系的理解，促进陆架边缘海动力。

南海北部陆架区是全球物质循环最为活跃和最为复杂的海域之一，跨陆架输运成为影响和控制物质过程和循环的一个十分重要因素。本课题通过对南海北部陆架区实测断面海流资料及高分辨率卫星遥感资料的综合分析，揭示夏季南海北部陆架区跨陆架输运的空间结构特征；阐明外海强迫、地形及局地风场等对跨陆架输运的影响；探讨了季风和深海强迫作用下南海北部陆架的输运规律和机制，给出陆架－外海水体输送量值的探索性估算。本课题的研究立足于实测海流资料及卫星遥感数据的分析，主要的学术成果为：.（1）通过实测海流资料分析，揭示南海北部特殊的海底地形是导致较强跨陆架输运的关键因素。等深线向岸凸进的区域，是陆架区产生跨陆架输运的敏感区和关键区。.（2）风场、南海季节尺度环流是南海北部跨陆架输运的制约因素，局地风场与季节尺度环流的短期变化明显影响跨陆架输运的强度。.（3）对南海北部选定区域水体通量计算结果表明，南海北部跨陆架输运夏季以向岸输运为主，冬季以离岸输运为主。