| As the developing of satellite altimeter, especially the emissions of TOPEX/POSEIDON,Jason-1,ERS-1/2,ENVIST and so on, the altimetric data sets are applied to more different ocean fields. Study about global tidal information is an important application and the results in deep water are perfect. However, in China sea because of its shallow water, the sea conditions are very complexity and the global tidal model is no longer applicable. This paper investigates tidal information in China sea and the EI Niňo event related to sea level anomaly in China sea and northwest Pacific ocean.The results could be summarized as below:1,Using j,v tidal model and harmonic analyses to obtain the harmonic constants of main tidal components from TOPEX/POSDEIDON data. Compare the results to the global tidal model CSR3.0. The studies indicate that the coherences of phases are well. The coherences of amplitudes in deep water are fine. But the tidal heights computed are obvious higher than the results of the global tidal model CSR3.0. Because of effect of land, the height of tide is high. Verification of the harmonic constants of four tidal components M2,S2,K1 and O1 and the result of tide gauge stations which are distributed in China sea: the mean bias of the amplitude and phase of M2 component is 4.5cm and 4.8o;the mean bias of the amplitude and phase of S2 component is 2.0cm and 4.1o;the mean bias of the amplitude and phase of K1 component is 1.0cm and 3.3o;the mean bias of the amplitude and phase of O1 component is 3.0cm and 3.5o. So after quantitative and qualitative analysis, the results computed here are more reasonable and are better than the results of global tidal model in China sea.2,In China sea modifying sea level anomaly by tidal height calculated from TOPEX/POSEIDON data. Plotting four small zone A,B,C and D which are token as Bohai Sea,the Yellow Sea,the East Sea and Nanhai Sea. Analyzing the sea level anomalies calculated from single satellite altimeter TOPEX/POSEIDON and those from merging data of three satellite altimeters TOPEX/POSEIDON and ERS-1/2. The correlations of two results are 95.2%,88.0%,91.3% and 85.9% respectively. The mean bias are 0.69cm,0.67cm,0.22cm and 0.32cm. Though the space-time sampling of merging data of three satellite altimeters are better than the single satellite altimeter and tidal information are reduced after space-time processed, the studies here show that the quality of sea level anomaly calculated form TOPEX/POSEIDON data in China sea is up to the multisatellite merging data. Thus, more precise merging data sets will be possible for variation of sea level and other oceanic applications.3,In China sea, because of amending tidal model, the quality of sea level anomaly calculated form TOPEX/POSEIDON data in China sea is up to the merging data. But in deep sea, tidal precision of global tidal model is well. Due to its higher space-time sampling, study sea level anomaly of northwest Pacific from merging data and the relation to EI Niňo event with data of Sea Surface Temperature. The results show that sea level anomaly has annual character and sea level ascend recently. According to the correlations of time lag between sea level anomaly and sea surface temperature, predicting the 2002/2003 El Niňo event successfully and verifying by 2006 El Niňo.
|
PDF Full Text Request