Rossby波对菲律宾以东太平洋海平面年际变化的影响研究

IMPACT OF ROSSBY WAVES ON INTERANUAL SEA LEVEL VARIABILITY IN THE PACIFIC OCEAN EAST OF THE PHILIPPINES

采用能够反映斜压大洋对大尺度海表面风应力旋度响应的一层半约化重力模式研究菲律宾以东太平洋海区Rossby波与海平面年际变化的关系。模式分别利用海区东侧验潮站和卫星高度计海表面数据作初始东边界,对Rossby波西传路径上的风应力旋度进行积分,得到西侧海平面信号。结果发现,模拟的海平面信号跟验潮站和卫星高度计资料相关性很高,并能模拟出海平面年际变化特征和低(高)异常信号由东侧产生并向西传播的过程,反映了一阶斜压Rossby波对菲律宾以东太平洋海区年际海平面变化的动力机制。

The influence of Rossby waves on sea level variability in the Pacific Ocean east of Philippines is studied based on a 1^2-1-layer reduced gravity model, which represents the relationship between baroclinic ocean and the large-scale sea-surface wind stress curl. Tidal gauges and altimeter observation sea level data were used as the eastern initial boundary separately in the model to simulate the sea level in the west area. The calculated results show a strong correlation with tidal gauge and altimeter observation data. The observed pattern of the interannual sea level variability is well reflected in the model results. The generation and westward spread of abnormal signals are also reproduced successfully. Therefore, the first baroclinic Rossby waves have a significant influence on the interannual sea level variability in the Pacific Ocean east of the Philippines.