日本地球惑星科学連合2018年大会

講演情報

[EE] ポスター発表

セッション記号 A (大気水圏科学) » A-CG 大気水圏科学複合領域・一般

[A-CG36] 衛星による地球環境観測

2018年5月24日(木) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:沖 理子(宇宙航空研究開発機構)、本多 嘉明(千葉大学環境リモートセンシング研究センター)、高薮 縁(東京大学 大気海洋研究所、共同)、松永 恒雄(国立環境研究所地球環境研究センター/衛星観測センター)、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 Ho1Po-chun Hsu1Kai-Ho Cheng1 (1.National Taiwan Ocean University)

キーワード: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.