Based on the satellite altimeter observation data from 1993 to 2022,this paper analyzes the temporal and spatial characteristics of the multi frequency seasonal variation signal of sea surface height in the Sulawesi sea,and gives the dynamic interpretation by using Rossby standard mode theory.The spectral analysis shows that there is a strong intra-seasonal signal of 30-90 days in the sea surface height variation of Sulawesi sea,and its average power spectral density is 13 times of the average power spectral density of the signal in half a year.These seasonal signals have discrete and discontinuous spectral peak periods,and the peaks of 54.0 d and 64.4 d are the largest,which are 28 times and 23 times of the signal of 30-90 days,respectively.The theoretical analysis shows that the existence of Rossby standard modes in the nearly closed Sulawesi deep-sea basin.The seasonal variation observed by satellite altimeter is consistent with the two-dimensional spatial structure evolution,period and westward propagation velo-city of Rossby standard mode results,the superposition of Rossby standard mode solutions presents a variance dis-tribution similar to the sea surface height variation field.This shows that the inherent oscillation of Sulawesi Sea basin is one of the important mechanisms that contribute to its intra-seasonal variation.
关键词
苏拉威西海/多频率季节内变化/时空特征/罗斯贝标准模态/固有振荡
Key words
Sulawesi Sea/multi-frequency intra-seasonal variation/spatiotemporal characteristics/Rossby normal modes/inherent oscillation
维普
万方数据