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Investigating the seasonal predictability of significant wave height in the West Pacific and Indian Oceans
  • Published Date:
  • Source:
    Geophysical Research Letters, 43(7), 3451-3458.
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  • Description:
    This study investigates seasonal prediction skill of significant wave height (SWH) in the West Pacific and Indian Oceans. We forced the WAVEWATCH III model with 10m winds from the National Centers for Environmental Prediction Reanalysis-2 and from the Community Climate System Model version 4 North American Multi-Model Ensemble retrospective forecasts for the period of January 1979 to December 2013. Results indicate potential for predicting SWH with several months lead time during boreal summers after the warm phase of El Nino-Southern Oscillation (ENSO) measured by deterministic and probabilistic skill scores in the Northwest Pacific and Bay of Bengal. During these summers, SWH is smaller than normal due to reduced atmospheric synoptic activity associated with an anomalously anticyclone in the western Pacific, leading to larger signal-to-noise ratio in the 10m winds, hence increasing SWH prediction skill. It is shown that ENSO has a nonlinear influence on the number of extremely large SWH events, with reduced number of extreme occurrences during boreal summers after the warm phase of ENSO.
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