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Versions g1.0 and g1.1 of the LASG/IAP Flexible Global Ocean-Atmosphere-Land System model

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Abstract

The latest two versions of the IAP Flexible Global Ocean-Atmosphere-Land System (FGOALS) model—versions g1.0 and g1.1, are described in this study. Both two versions are fully coupled GCMs without any flux correction, major changes for g1.1 mainly lie in four aspects: (1) advection schemes for tracer in the ocean component model; (2) zonal filter scheme in high latitudes in the ocean component model; (3) coupling scheme for fresh water flux in high latitudes; and (4) an improved algorithm of air-sea turbulent flux depending on the surface current of the ocean. As a result, the substantial cold biases in the tropical Pacific and high latitudes are improved by g1.1, especially g1.1 simulates more reasonable equatorial thermocline, poleward heat transport, zonal overturning stream function in the ocean and sea ice distribution than g1.0. Significant ENSO variability are simulated by both versions, however the ENSO behavior by g1.0 differs from the observed one in many aspects: about twice ENSO amplitude as observed, false ENSO asymmetry, only one peak period around 3 years, etc. Due to improved mean climate state by g1.1, many basic characteristics of ENSO are reproduced by g1.1, e.g., more reasonable ENSO amplitude, two peaks of power spectra for ENSO events, and positive SST skewness in the eastern Pacific as observed.

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Authors and Affiliations

  1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

    Yongqiang Yu  (俞永强), Weipeng Zheng  (郑伟鹏), Bin Wang  (王 斌), Hailong Liu  (刘海龙) & Jiping Liu  (刘骥平)

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  1. Yongqiang Yu  (俞永强)
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  2. Weipeng Zheng  (郑伟鹏)
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Correspondence to Yongqiang Yu  (俞永强).

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Yu, Y., Zheng, W., Wang, B. et al. Versions g1.0 and g1.1 of the LASG/IAP Flexible Global Ocean-Atmosphere-Land System model. Adv. Atmos. Sci. 28, 99–117 (2011). https://doi.org/10.1007/s00376-010-9112-5

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