양자강 담수의 여름 황해 및 동중국해 해면수온 상승효과

Abstract

This study explores the effects of Changjiang river discharge (CRD) on the density stratifications and associated sea surface temperature (SST) changes using a global ocean general circulation model with regional focus on the Yellow and East China Seas (YECS). The regressed field of SST on CRD shows that the CRD contributes to surface warming in August. Heat budget analysis finds that the warming is attributable to the formation of a CRD-induced barrier layer, which tends to enhance stratification at the mixed layer base, thereby reducing both vertical mixing and entrainment cooling. The SST difference map between the composites of flood and drought years shows warming patterns over the freshening area, which confirms CRD-induced surface warming. This result suggests that the barrier layer formation due to CRD is an important contributor to the surface heat budget in the YECS in summer.