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Indian Ocean Dipole Modes Associated with Different Types of ENSO Development
Fan, L; Liu, QY; Wang, CZ; Guo, FY;
Source PublicationJOURNAL OF CLIMATE
AbstractThis study identifies several modes of coevolution of various types of El Nino-Southern Oscillation (ENSO) and Indian Ocean dipole (IOD) by performing rotated season-reliant empirical orthogonal function (S-EOF) analysis with consideration of ENSO asymmetry. The first two modes reveal that early-onset ENSO is associated with subsequent strong IOD development, whereas late-onset ENSO forces an obscure IOD pattern with marginal SST anomalies in the western Indian Ocean. Further studies show that El Nino starting before early summer can more easily force an IOD event than that starting in late summer or fall, even when they are of equivalent magnitudes. This is because the atmospheric responses over the Indian Ocean to the eastern Pacific warming are in sharp contrast between early and late summer. Early-onset (late onset) El Nino can (cannot) cause favorable atmospheric circulation conditions over the Indian Ocean for inducing the western Indian Ocean warming, which facilitates the subsequent IOD development. In addition, the different propagations of ocean dynamic Rossby waves during the early-or late-onset types of ENSO are also accountable for the different IOD development. For the higher-order modes, the rotated S-EOF of "Nino only" cases shows a coevolution between a negative IOD mode and a date line Pacific El Nino, with warm sea surface temperature anomalies originating from the northern Pacific meridional mode.
Department[Fan, Lei; Liu, Qinyu] Ocean Univ China, CIMST, Qingdao Natl Lab Marine Sci & Technol, Phys Oceanog Lab, Qingdao, Peoples R China; [Wang, Chunzai] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China; [Guo, Feiyan] Qingdao Meteorol Bur, Qingdao, Peoples R China
Funding ProjectLTO
Document Type期刊论文
Recommended Citation
GB/T 7714
Fan, L,Liu, QY,Wang, CZ,et al. Indian Ocean Dipole Modes Associated with Different Types of ENSO Development[J]. JOURNAL OF CLIMATE,2017,30(6):2233-2249.
APA Fan, L,Liu, QY,Wang, CZ,Guo, FY,& Ocean Dipole Modes Associated with Different Types of ENSO Development.JOURNAL OF CLIMATE,30(6),2233-2249.
MLA Fan, L,et al."Indian Ocean Dipole Modes Associated with Different Types of ENSO Development".JOURNAL OF CLIMATE 30.6(2017):2233-2249.
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