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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 31 Jan 2020

Submitted as: model description paper | 31 Jan 2020

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A revised version of this preprint was accepted for the journal GMD.

Taiwan Earth System Model Version 1: Description and Evaluation of Mean State

Wei-Liang Lee1, Yi-Chi Wang1, Chein-Jung Shiu1, I-chun Tsai1, Chia-Ying Tu1, Yung-Yao Lan1, Jen-Ping Chen2, Hau-Lu Pan3, and Huang-Hsiung Hsu1 Wei-Liang Lee et al.
  • 1Research Center for Environmental Changes
  • 2National Taiwan University
  • 3National Center for Environmental Protection

Abstract. The Taiwan Earth System Model (TaiESM) version 1 is developed based on Community Earth System Model version 1.2.2 of National Center for Atmospheric Research. Several innovated physical and chemical parameterizations, including trigger functions for deep convection, cloud macrophysics, aerosol, and three-dimensional radiation–topography interaction, as well as a one-dimensional mixed-layer model optional for the atmosphere component, are incorporated. The precipitation variability, such as diurnal cycle and propagation of convection systems, is improved in TaiESM. TaiESM demonstrates good model stability in the 500-year preindustrial simulation in terms of the net flux at the top of the model, surface temperatures, and sea ice concentration. In the historical simulation, although the warming before 1935 is weak, TaiESM well captures the increasing trend of temperature after 1950. The current climatology of TaiESM during 1979–2005 is evaluated by observational and reanalysis datasets. Cloud amounts are too large in TaiESM, but their cloud forcing is only slightly weaker than observational data. The mean bias of the sea surface temperature is almost zero, whereas the surface air temperatures over land and sea ice regions exhibit cold biases. The overall performance of TaiESM is above average among models in Coupled Model Intercomparison Project phase 5, particularly that the bias of precipitation is smallest. However, several common discrepancies shared by most models still exist, such as the double Intertropical Convergence Zone bias in precipitation and warm bias over the Southern Ocean.

Wei-Liang Lee et al.

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Latest update: 08 Jul 2020
Publications Copernicus
Short summary
Taiwan Earth System Model (TaiESM) is a new climate model developed in Taiwan. It includes several new features, and therefore it can better simulate the occurrence of convective rainfall, solar energy received by mountainous surfaces, and more detail chemical processes in aerosols. TaiESM can well capture the trend of global warming after 1950, and its overall performance in most meteorological quantities is better than the average of global models used in IPCC AR5.
Taiwan Earth System Model (TaiESM) is a new climate model developed in Taiwan. It includes...