Relationship between Indian Ocean Dipole and ENSO and Their Connection with the Onset of South China Sea Summer Monsoon

摘要

Most of Indian Ocean Dipole (IOD) events have closely positive relation to simultaneous ENSO events in summer and autumn. IOD events in autumn (mature phase) are also highly related to ENSO events in winter (mature phase). When these two kinds of events happen in phase, i.e. positive (negative) IOD events couple with El Nino (La Nina) events, they are always followed by late (early) onsets of South China Sea summer monsoon (SCSSM). On the contrary, when these two kinds of events happen out of phase, i.e. positive (negative) IOD events couple with La Nina (El Nino) events, however, they are also followed by normal onsets of SCSSM. In addition, single IOD event or single ENSO event cannot correspond well to the abnormal onset of SCSSM.