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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2017-206
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 29 Nov 2017

Model description paper | 29 Nov 2017

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Geoscientific Model Development (GMD) and is expected to appear here in due course.

The NUIST Earth System Model (NESM) version 3: Description and preliminary evaluation

Jian Cao1,2, Bin Wang1,2, Young-Min Yang2, Libin Ma1,2, Juan Li1,2, Bo Sun1,2, Yan Bao1,2, Jie He1,2, and Xiao Zhou2 Jian Cao et al.
  • 1Earth System Modeling Center, the Nanjing University of Info rmation Science and Technology, Nanjing 210044, China
  • 2China-US joint Atmosphere-Ocean Research Center and Internat ional Pacific Research Center, University of Hawaii, Honolulu Hawaii 96822 USA

Abstract. The Nanjing University of Information Science and Technology Earth System Model version 3 (NESM v3) has been developed, aiming to provide a numerical modeling platform for cross-disciplinary earth system studies, project future Earth's climate and environment changes, as well conduct subseasonal-to-seasonal prediction. While the previous model version NESM v1 simulates well the internal modes of climate variability, it has no vegetation dynamics and suffers considerable radiative energy imbalance at the top of the atmosphere and surface, resulting in large biases in the global mean surface air temperature, which limit its utility to simulate past and project future climate changes. The NESM v3 upgraded the atmospheric and land surface model components and improved physical parameterization and conservation of coupling variables. Here we describe the new version's basic features and how the major improvements were made. We demonstrate the v3 model's fidelity and suitability to address the global climate variability and change issues. The 500-year PI experiment shows negligible trends in the net heat flux at the top of atmosphere and the Earth surface. Consistently, the simulated global mean surface air temperature, land surface temperature and sea surface temperature (SST) are all in a quasi-equilibrium state. The conservation of global water is demonstrated by the stable evolution of the global mean precipitation, sea surface salinity (SSS) and sea water salinity. The sea ice extents (SIEs), as a major indication of high latitude climate, also maintain a balanced state. The simulated spatial patterns of the mean outgoing longwave radiation, SST, precipitation, SSS fields are realistic, but the model suffers from a cold bias in the North Atlantic, a warm bias in the Southern Ocean and associated deficient Antarctic sea ice area, as well as a delicate sign of the double ITCZ syndrome. The estimate radiative forcing of quadrupling carbon dioxide is about 7.24Wm-2, yielding a climate sensitivity feedback parameter of −0.98Wm-2K-1, and the equilibrium climate sensitivity is 3.69K. The transient climate response from the 1pct/year increasing CO2 experiment is 2.16K. The model's performance on internal modes and responses to external forcing during the historical period will be documented in an accompanying paper.

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Jian Cao et al.
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Jian Cao et al.
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The development of version 3 of the Nanjing University of Information Science and Technology (NUIST) Earth System Model (NESM v3) aims at building up a comprehensive numerical modeling laboratory for multi-disciplinary studies of the Climate System and Earth System. The model evaluation shows the model obtained stable long-term integrations and reasonable global mean states under the preindustrial (PI) forcing and simulated reasonable climate responses to transient and abrupt CO2 forcing.
The development of version 3 of the Nanjing University of Information Science and Technology...
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