冬季山东南部沿海水温10—20天的周期性振动

THE 10-20 DAY SST OSCILATION OF THE SOUTHERN COAST OF SHANDONG PENINSULA IN WINTER

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。

The methods of spectrum analysis and numerical filtering are employed to analyse sea temperature, sea level, sea level pressure and sea level wind of the ocean stations at the southern coast of Shandong Peninsula in winter time. The results show that there is a kind of 10-20 day oscillation of sea surface temperature and sea level in the continental shelf of Shandong peninsula which is the same as the oscillation of sea level pressure and the wind field. The low frequency oscillation of the sunoptic scale might be a respondence to the atmospheric impact in winter time. In order to prove the conclusion mentioned above a simple linear model whose analytic resolusion is obtained by using Laplace transformation has been designed to discuss the oscillation and the respondent mechanism.