An Analysis of Climate Oscillations in Pacific Subtropical Cells

摘要：

　　The Subtropical Cells (STCs),bridging extratropical and tropical water in the Pacific upper ocean,is known to regulate tropical climate variability.In this study,we analyze interannual- to decadal-scale oscillations in the Pacific STCs using the Simple Ocean Data Assimilation (SODA 2.2.4) to study dynamics of STCs variability.We compare the variability of the interior equatorward transports across 9°S and 9°N in the Pacific Ocean with changes of the Equatorial Undercurrent (EUC),equatorial upwelling and the poleward Ekman transport in the surface layer.Results show that the interior transport is correlated positively with EUC and negatively with equatorial SST changes at both interannual and decadal time scales.The interior pycnocline transport is also anti-correlated with the surface Ekman transport along the same latitudes,suggesting a strong connection with the local wind forcing.These results are in general agreement with that of past studies.Our analysis further shows that significant correlations between SST and STCs are obtained only when the interior transport is zonally averaged across the basin,but not in the eastern part.We also find that the ENSO-related warm water volume changes are highly correlated with the meridional volume transport through 9°N and 9°S which is wider than the equatorial wave guide.Possible relevant mechanisms for the STC oscillations are being analyzed.

关键词： Pacific Subtropical Cells (STCs) extratropical-tropical communication interannual and decadal variability recharge oscillation theory

作者: Han-Ching CHEN Chung-Hsiung SUI Yu-Heng TSENG

作者单位: Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan, 10617 Ocean Section, Climate and Global Dynamics Division, National Center for Atmospheric Research, Bould

会议类型: 国际会议

会议名称: The 17th Pacific -Asian Marginal Seas Meeting(第十七届太平洋与亚洲边缘海国际会议)

会议地点: 杭州

会议语种:英文

页码: 53-60

在线出版日期: 2013-04-23（万方平台首次上网日期，不代表论文的发表时间）