Long baroclinic Rossby waves with periods of about 500 d near 20°N in the northwest Pacific Ocean

作     者：CHEN Haiying QIAO Fangli FANG Guohong WANG Yonggang WEI Zexun 

作者机构：Institute of Oceanography Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Marine Science and Numerical Modeling First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Graduate School of Chinese Academy of Sciences Beijing 100039 China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2006年第25卷第3期

页      面：1-10页

核心收录：

学科分类：0710[理学-生物学] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：This study was supported by the National Natural Science Foundation of China under contract Nos 40136010 and 40520140074 

主　　题：low frequency oscillation Rossby waves maps of sea level anomalies northwest Pacific Ocean two-layer model 

摘      要：On the basis of maps of sea level anomalies data set from October 1992 to January 2004, pronounced low frequency variations with periods of about 500 d are detected in the area near 20°N from 160°W to 130°E. A linear two-layer model is employed to explain the mechanism. It is found that the first-mode long baroclinic Rossby waves at 20°N in the northwest Pacific propagate westward in the form of free waves at a speed of about 10.3 cm/s. This confirms that the observed low frequency variabilities appear as baroclinic Rossby waves. It further shows that these low frequency variabilities around 20°N in the northwest Pacific can potentially be predicted with a lead up to 900 d.