Assessment of the seasonal variation of simulated Wyrtki jet over the tropical Indian Ocean in CMIP5 models |
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| Authors: | Lin Liu Baochao Liu Guoqing Han Lin Feng Xinfang Li Weidong Yu |
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| Institution: | 1.Center for Ocean and Climate Research,First Institute of Oceanography, State Oceanic Administration,Qingdao,China;2.Laboratory for Regional Oceanography and Numerical Modeling,Qingdao National Laboratory for Marine Science and Technology,Qingdao,China;3.Nanjing University of Information Science and Technology,Nanjing,China;4.Marine Information and Computing Center,First Institute of Oceanography, State Oceanic Administration,Qingdao,China |
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| Abstract: | Performances of the 24 Coupled Model Intercomparison Project Phase 5 (CMIP5) models in simulating the Wyrtki Jet over the tropical Indian Ocean are evaluated, and the results show large diversity in the simulated current intensity at seasonal timescale. These coupled models are able to capture the dominant spatial distribution of observed Wyrtki Jet, the central equatorial region. The simulated seasonal variations of Wyrtki Jet are also reproduced quantitatively, though the simulated amplitudes from CMIP5 models are quite spread among the CMIP5 models. Compared with the observation, some coupled models are not able to present the evolution of Wyrtki Jet in fall season and the decay phase has been postponed 1 month later. Further diagnostic illustrates that the simulated surface zonal wind has remarkable impact on the evolution of Wyrtki Jet in fall season over the tropical Indian Ocean. This study also points out that there is a common problem in these models that most of them present 1-month delayed Wyrtki Jets peak time than the normal climatological condition along the center equatorial Indian Ocean. |
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