Impact of Indian Ocean Dipole on intraseasonal zonal currents at 90°E on the equator as revealed by self-organizing map

Iskandar, Iskhaq and Tozuka, Y and Masumoto, Yukio and Yamagata, T (2008) Impact of Indian Ocean Dipole on intraseasonal zonal currents at 90°E on the equator as revealed by self-organizing map. GEOPHYSICAL RESEARCH LETTERS, 35. ISSN doi:10.1029/ 2008GL033468

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    Abstract

    A neural network pattern recognition approach called self-organizing map (SOM) has been used to examine the impact of the Indian Ocean Dipole (IOD) on intraseasonal zonal currents in the eastern equatorial Indian Ocean. This study shows that during negative IOD events the intraseasonal zonal currents are mostly dominated by the first two modes. On the other hand, contributions from the higher modes to the intraseasonal zonal current significantly increase during positive IOD events. This is attributed to the change in the background stratification associated with the IOD events; the sharp pycnocline in the eastern basin during the positive IOD events causes the wind forcing to project more onto the higher modes.

    Item Type: Article
    Uncontrolled Keywords: Iskandar, I., T. Tozuka, Y. Masumoto, and T. Yamagata (2008), Impact of Indian Ocean Dipole on intraseasonal zonal currents at 90 E onthe equator as revealed by self-organizing map, Geophys. Res. Lett., 35, L14S03, doi:10.1029/2008GL033468.
    Subjects: Q Science > QC Physics
    Divisions: Faculty of Mathematics and Natural Sciences > Department of Physics
    Depositing User: Dr. Iskhaq Iskandar
    Date Deposited: 02 Feb 2015 08:47
    Last Modified: 02 Feb 2015 08:47
    URI: http://eprints.unsri.ac.id/id/eprint/5111

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