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使用谱分析和数字滤波等方法,对山东南部沿海冬季的日平均水温、水位、海平面气压和风场等历史资料(1973—1983)做了分析。结果发现,这里的水温和水位存在10—20天的振动,这种振动与同期气压场和沿岸风的振动相同,陆架水温和水位的这种天气尺度振动恰好是对冬季风强迫的响应。为证明这一物理过程,设计了一个简单的线性理论模式,并用Laplace变换获得了其解析解,证明了上述响应的物理机制。
Using the methods of spectral analysis and digital filtering, the historical data (1973-1983) of daily mean water temperature, water level, sea level pressure and wind field in the coastal area of southern Shandong were analyzed. The results show that there is a 10-20 day vibration in the water temperature and water level, which is the same as the atmospheric pressure field and the coastal wind. The weather scale vibration of the shelf water temperature and water level happens to be a response to the winter monsoon force. To prove this physical process, a simple linear theoretical model was designed and its analytical solution was obtained by Laplace transform. The physical mechanism of the above response was proved.