황해 및 동중국해 표층염분의 엔소 관련 변동성

Abstract

This study investigates interannual variability of sea surface salinity (SSS) in the Yellow and East China Seas (YECS) using a global ocean general circulation model with regional focus on the YECS. A cyclostationary EOF analysis finds that the interannual variability of the SSS in the YECS is mainly attributable to a Changjiang river discharge (CRD) variability. The CRD variability is linked to El Niño–Southern Oscillation (ENSO)-related precipitation over east China. That is, composite precipitation patterns in El Niño and La Niña years show that when El Niño events occur in winter, more rainfall is observed over central China in the rainy season of the following years. The heavy precipitation leads to a large amount of CRD, which results in decreasing SSS in the YECS. This suggests that summer SSS variability in the YECS is closely linked to ENSO via the summer precipitation system over east China.