Seasonal and Interannual Variabilities of the Central Indian Ocean Mode

摘要: AbstractThe central Indian Ocean (CIO) mode, an intrinsic coupled plays important role in the intraseasonal variabilities over monsoon region. Besides variabilities, CIO mode also has pronounced seasonal and interannual variabilities. The is active during boreal summer but suppressed winter. seasonality mainly attributable to barotropic instability, which caused by large meridional shear of zonal winds. By decomposing temporal tendency gradient winds, it found that wind follows variation horizontal eddy flux, indicates importance multiscale interaction tropical dynamics. variability depends on energy transfer associated with instability. influences El Nino or La Nina dipole–zonal (IODZM) are analyzed. have moderate imp...