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Volume 11, issue 7 | Copyright
Geosci. Model Dev., 11, 2975-2993, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 25 Jul 2018

Model description paper | 25 Jul 2018

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, Xiao Zhou2, and Liguang Wu1 Jian Cao et al.
  • 1Earth System Modeling Center, the Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 2China-US joint Atmosphere-Ocean Research Center and International 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 climate and environment changes, and conduct subseasonal-to-seasonal prediction. While the previous model version NESM v1 simulates the internal modes of climate variability well, 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 limits its utility to simulate past and project future climate changes. The NESM v3 has upgraded 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 global climate variability and change issues. The 500-year preindustrial (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 energy states, SST, precipitation, and 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 estimated 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 1%yr−1CO2 (1pctCO2) increase 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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Short summary
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 multidisciplinary 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 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...