2010~2011年吕宋海峡西侧潜标观测的初步分析

摘要

A mooring system was placed at a depth of about 3300 m west of the Luzon Strait. Upper ocean current, temperature and salinity were measured at a high frequency for more than nine months. Using harmonic analysis and power spectral analysis, we discover that at the measuring site, O1 tides had a greater amplitude in spring, and K1 tides had a greater amplitude in winter. In summer, the internal tides were relatively weak, but there were always irregular diurnal tides at our observation site. We observed near-inertial oscillations at a depth of 200~270 m after Typhoon Nanmadol passed by; they rotated clockwise and the energy was transported downward. There were 105 internal solitary waves (solitons) passed by during our observation period, while there were no less internal solitary waves in winter than in spring and summer. The arrival times of two adjacent internal solitary waves differed by about 24.6~24.7 h, which cannot be divided into type-a waves or type-b waves.%2010年在吕宋海峡西侧约3300m深处的观测潜标得到了上层海洋9个多月的高频率的流场和温盐数据，用调和分析和功率谱分析等方法对观测结果进行分析，发现测点春季的O1潮较强，而冬季K1潮较强，夏季内潮较弱，但整体都为不规则日潮。台风“南玛都”经过后测点200~270m次表层出现明显近惯性振荡，其沿顺时针旋转，能量下传。测量期间共有105个孤立内波经过测点，测点处冬季的孤立内波数量并不少于春夏季。两个相邻孤立内波间的时间间隔约为24.6~24.7小时，并不存在a型波和b型波的区别。