Japan Geoscience Union Meeting 2018

Presentation information

[EE] Poster

A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG36] Satellite Earth Environment Observation

Thu. May 24, 2018 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Riko Oki(Japan Aerospace Exploration Agency), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Yukari Takayabu(東京大学 大気海洋研究所, 共同), Tsuneo Matsunaga(Center for Global Environmental Research and Satellite Observation Center, National Institute for Environmental Studies), Allen HL Huang (University of Wisconsin Madison)

[ACG36-P18] ENSO and PDO effects on sea level changes in the current systems of North Pacific Ocean from satellite altimetry

*Chung-Ru Ho1, Po-chun Hsu1, Kai-Ho Cheng1 (1.National Taiwan Ocean University)

Keywords:ENSO, PDO, Sea level, North Pacific Ocean, Satellite altimetry

The most significant effects of climate variability on the North Pacific Ocean (NPO) are the interannual variability (El Niño – Southern Oscillation, ENSO) and Pacific Decadal Oscillation (PDO) phenomena. Both oscillations are related to ocean temperatures. In this study, the influences of thermal expansion/shrinking by both oscillations on the sea level changes in the different current systems in the North Pacific Ocean are investigated and discussed. Sea level anomaly data derived from satellite altimetry from 1993 to 2014 are used to analyze the variations of sea level change. The results show that 1) sea level rises in the regions of Kuroshio Extension, Oyashio Current, Alaska Current, and California Current during the El Niño and negative PDO phase, 2) sea level rises are not significant or even descend in all current systems during the La Niña and positive PDO phase, and 3) ENSO affects more significantly on sea level changes than PDO does in the North Pacific. These phenomena imply that the thermal expansion is a key factor to cause the sea level changes in these current systems.