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利用“延平2号”科学调查船于2005年6月下旬在台湾海峡中部(119.2°E,24.3°N)实施的定点连续观测资料,研究了夏季风期间障碍层的日变化过程及其局地反馈特征.障碍层开始形成时,由于非太阳辐射局限于上混合层,而太阳辐射可以穿透混合层底直至温跃层,导致障碍层内累积了最多热能,形成逆温层.随着障碍层内部热量的不断累积,障碍层与上混合层之间的热交换过程逐渐增强,上混合层显著增暖.此外,障碍层对应浮力频率极小值区,具有较弱的层结稳定性;针对海气通量的分析表明障碍层造成了显著的局地感热、潜热通量异常.进一步分析表明,海表风搅拌产生的湍动能在向下传输过程中,次盐跃层和温跃层构成了两个界面,大部分湍动能被较浅的盐度层结阻挡,限制在混合层以上,部分穿透混合层底的湍动能再次被温跃层阻挡,障碍层对应湍动能的薄弱区.
Using the continuous observation data of the “Yanping 2” scientific survey ship in the middle of Taiwan Strait (119.2 ° E, 24.3 ° N) in late June 2005, the diurnal variation of the barrier layer during summer monsoon and its Local feedback characteristics.At the beginning of the barrier layer, due to the non-solar radiation is confined to the upper mixing layer, and the solar radiation can penetrate the bottom of the mixing layer until the thermocline, resulting in the accumulation of obstacles in the most heat energy, the formation of inversion layer The heat accumulation in the barrier layer continuously increases, the heat exchange process between the barrier layer and the upper mixing layer gradually increases, and the upper mixing layer significantly increases. In addition, the barrier layer corresponds to the minimum value of the buoyancy frequency region and has weak stratification stability The analysis of the air-sea flux shows that the obstacle layer caused significant local sensible heat and latent heat flux abnormalities.Further analysis shows that the turbulent kinetic energy produced by the sea surface wind mixing during the downward transmission, The thermocline layer forms two interfaces. Most of the turbulent kinetic energy is blocked by the shallower salinity layer, confined above the mixed layer, and the turbulent kinetic energy of the partially penetrated mixed layer bottom is blocked by the thermocline again. The barrier layer corresponds to the turbulent kinetic energy Weak area.