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对1993年1月至2001年12月TOPEX/POSEIDON卫星高度计海面高度距平的分析表明,在吕宋海峡两侧各有一个海面高度波动高能区,其中心分别在(19.5°N,119.5°E)和(22.0°N,124.0°E),其间有一低能带将二者隔离,“远区”EOF分析亦显示二者的波动规律相对独立.对“近区”的EOF分析揭示南海东北部海域海面高度波动以季节变化为主,伴有明显的季节内变化和年际变化.其中EOF 1和EOF 2占总波动能量的66.7％,均主要表现为季节变化,但相位相差约3个月.EOF 1的主要形态是以吕宋岛西北(18.0°N,119.0°E)为中心的海面高度振荡,其峰值出现于8-9月间,谷值则出现于1-2月间,主要反映了南海深水海盆比容高度的季节变化和相应的环流调整.EOF2的形态则表现为东南至西北向的季节性交替起伏,主要反映了南海北部近海季风导致的海面高度Ekmen调整.分析还表明,季节内变化是南海东北海域海面高度波动的重要分量,它主要反映了吕宋海峡西侧海域中尺度过程的频繁活动.此外,所有主要EOF模态都呈现年际变化.
An analysis of the sea surface anomalies of the TOPEX / POSEIDON satellite altimeters from January 1993 to December 2001 shows that there is one high-energy region of sea level fluctuations on each side of the Luzon Strait with centers centered at (19.5 ° N, 119.5 ° E ) And (22.0 ° N, 124.0 ° E) with a low energy band to isolate the two, while the EOF analysis of the “distant region” also shows that the fluctuations of the two are relatively independent. The EOF analysis of the “near region” reveals that the northeastern South China Sea The variation of sea surface height is mainly seasonal, with significant intraseasonal and interdecadal variations, of which EOF 1 and EOF 2 account for 66.7% of the total fluctuating energy, both of which are mainly seasonal changes, but with a phase difference of about 3 months. The main form of EOF 1 is the sea level oscillation centering on the northwest of Luzon (18.0 ° N, 119.0 ° E), with the peak occurring between August and September and the valley between January and February, mainly reflecting The seasonal variation of the specific volume of the South China Sea deep basin and the corresponding circulation regulation.The pattern of EOF2 shows the seasonal alternation from southeast to northwest and mainly reflects the Ekmen adjustment of the sea surface height caused by the offshore monsoon in the northern South China Sea.The analysis also shows that, The seasonal variation is the sea surface height fluctuation in the northeastern South China Sea Important components, which mainly reflects the waters west of Luzon Strait frequent activity scale process. In addition, all major EOF modes are presented interannual variability.