Roles of ENSO and PDO in the Link of the East Asian Winter Monsoon to the following Summer Monsoon

• DOI: 10.1175/jcli-d-12-00021.1
• Publication Date: 2012-07-27T03:14:50Z
• Authors: Wen Chen; Juan Feng; Renguang Wu
• Keywords: Anticyclone; Extratropical cyclone; East Asian Monsoon

Abstract The present study investigates the roles of El Niño–Southern Oscillation (ENSO) and Pacific decadal oscillation (PDO) in relationship between East Asian winter monsoon (EAWM) following summer (EASM). variability EAWM is divided into an ENSO-related part named EAWMEN ENSO-unrelated EAWMres. Corresponding to a weak EAWMEN, anomalous low-level anticyclone forms over western North (WNP) persists from summer. This enhances southerlies coast Asia Hence, tends be followed by strong EASM vice versa. As such, link established EASM. persistence this WNP may mainly attributed sea surface temperature anomalies associated with tropical Indian Ocean extratropical Pacific. In contrast, corresponding EAWMres, only seen winter, there no obvious EAWMres Therefore, observed EAWM–EASM dominated ENSO. It found that EAWMEN–EASM modulated PDO. There much stronger after during positive PDO phases than negative phases.