ENSO dynamics and diversity resulting from the recharge oscillator interacting with the slab ocean

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• 作者：Yanshan Yu ; Dietmar Dommenget ; Claudia Frauen ; Gang Wang ; Scott Wales
• 关键词：ENSO dynamics ; Slab ocean ; ENSO diversity ; Tropical climate variability ; Climate model
• 刊名：Climate Dynamics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：46
• 期：5-6
• 页码：1665-1682
• 全文大小：2,016 KB
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• 作者单位：Yanshan Yu (1)
  Dietmar Dommenget (1)
  Claudia Frauen (1)
  Gang Wang (1)
  Scott Wales (2)
  
  1. School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, 3800, Australia
  2. The University of Melbourne, Parkville, VIC, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Meteorology and Climatology
  Oceanography
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0894

文摘

El Nino-Southern Oscillation (ENSO) is the leading mode of interannual global climate variability, which in its essence is often described by the equatorial dynamics of the recharge oscillator with a fixed pattern. Here we explore the idea that ENSO can be simulated in a model with a fixed pattern of sea surface temperature variability following the recharge oscillator mechanism, which interacts with the thermodynamic red noise of a slab ocean. This model is capable of simulating the leading modes of sea surface temperature variability in the tropical Pacific in good agreement with the observations and most coupled general circulation models. ENSO dynamics, amplitude, seasonality, the structure of the leading patterns, its meridional extension, its variations in an eastern and central Pacific pattern and associated positive feedbacks are all influenced and simulated well by including the interaction of recharge oscillator and the thermodynamic coupling to the slab ocean model. We further point out that much of the ENSO diversity in the spatial structure is a reflection of this interaction. However, it also has to be noted that some equatorial dynamics are missing in this model and in coupled general circulation models that are important for the ENSO diversity.