대기 강제력에 대한 북태평양의 13일주기 근처에서의 순압 반응

Abstract

This talk presents near 13-day barotropic ocean response to the atmospheric forcing in the North Pacific using both in-situ bottom-pressure observations and numerical simulations. In the Kuroshio Extension System Study (KESS) east of Japan, bottom-pressure observations over the 2-year study period exhibit strong high-frequency variability near 13 days. The first cyclostationary empirical orthogonal function mode for the near 13-day KESS bottom pressure explains about 57% of the variance and exhibits nearly in-phase variability in space with a hint of westward propagation. The 13-day variability is strong during the winter and is driven by the large-scale wind-stress curl over a broad region of the North Pacific. Modeling results over the North Pacific closely follow the observations, and indicate that topography confines the barotropic response to the west of Emperor Seamount Chain and slows the westward propagation of the near 13-day bottom-pressure variability.pan, bottom-pressure observations over the 2-year study period exhibit strong high-frequency variability near 13 days. The first cyclostationary empirical orthogonal function mode for the near 13-day KESS bottom pressure explains about 57% of the variance and exhibits nearly in-phase variability in space with a hint of westward propagation. The 13-day variability is strong during the winter and is driven by the large-scale wind-stress curl over a broad region of the North Pacific. Modeling results over the North Pacific closely follow the observations, and indicate that topography confines the barotropic response to the west of Emperor Seamount Chain and slows the westward propagation of the near 13-day bottom-pressure variability.