Interannual variability of the South Indian Countercurrent
Menezes, Viviane V.
Phillips, Helen E.
Vianna, Marcio L.
Bindoff, Nathaniel L.
MetadataShow full item record
In the present work, we investigate the interannual variability of the South Indian Countercurrent (SICC), a major and still understudied current of the Indian Ocean circulation. To characterize the interannual variability of the SICC, four different data sets (altimetry, GLORYS, OFAM3, and SODA) are analyzed using multiple tools, which include Singular Spectrum Analysis and wavelet methods. The quasi-biennial band dominates the SICC low-frequency variance, with the main peak in the 1.5–1.8 year interval. A secondary peak (2.1–2.5 year) is only found in the western basin. Interannual and decadal-type modulations of the quasi-biennial signal are also identified. In addition, limitations of SODA before the 1960s in the SICC region are revealed. Within the quasi-biennial band, the SICC system presents two main patterns with a multiple jet structure. One pattern is characterized by a robust northern jet, while in the other the central jet is well developed and northern jet is weaker. In both patterns, the southern jet has always a strong signature. When the northern SICC jet is stronger, the northern cell of the subtropical gyre has a triangular shape, with its southern limb having a strong equatorward slant. The quasi-biennial variability of the SICC is probably related to the Indian Ocean tropical climate modes that are known to have a strong biennial characteristic.
Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 121 (2016): 3465–3487, doi:10.1002/2015JC011417.
Suggested CitationArticle: Menezes, Viviane V., Phillips, Helen E., Vianna, Marcio L., Bindoff, Nathaniel L., "Interannual variability of the South Indian Countercurrent", Journal of Geophysical Research: Oceans 121 (2016): 3465–3487, DOI:10.1002/2015JC011417, https://hdl.handle.net/1912/8477
Showing items related by title, author, creator and subject.
Multidecadal Indian Ocean variability linked to the Pacific and implications for preconditioning Indian Ocean dipole events Ummenhofer, Caroline C.; Biastoch, Arne; Böning, Claus W. (American Meteorological Society, 2017-02-15)The Indian Ocean has sustained robust surface warming in recent decades, but the role of multidecadal variability remains unclear. Using ocean model hindcasts, characteristics of low-frequency Indian Ocean temperature ...
Intraseasonal rainfall variability in the Bay of Bengal during the Summer Monsoon : coupling with the ocean and modulation by the Indian Ocean Dipole Jongaramrungruang, Siraput; Seo, Hyodae; Ummenhofer, Caroline C. (John Wiley & Sons, 2017-01-24)The Indian Summer Monsoon rainfall exhibits pronounced intraseasonal variability in the Bay of Bengal (BoB). This study examines the intraseasonal rainfall variability with foci on the coupling with sea surface temperatures ...
Yu, Lisan; Jin, Xiangze; Weller, Robert A. (American Meteorological Society, 2007-07-01)This study investigated the accuracy and physical representation of air–sea surface heat flux estimates for the Indian Ocean on annual, seasonal, and interannual time scales. Six heat flux products were analyzed, including ...