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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-172
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-172
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 30 Jul 2019

Submitted as: model description paper | 30 Jul 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Beijing Climate Center Earth System Model version 1 (BCC-ESM1): Model Description and Evaluation

Tongwen Wu1, Fang Zhang1, Jie Zhang1, Weihua Jie1, Yanwu Zhang1, Fanghua Wu1, Laurent Li1,2, Xiaohong Liu3, Xiao Lu4, Lin Zhang4, Jun Wang5, and Aixue Hu6 Tongwen Wu et al.
  • 1Beijing Climate Center, China Meteorological Administration, Beijing, China
  • 2Laboratoire de Météorologie Dynamique, IPSL, CNRS, Sorbonne Université, Ecole Normale Supérieure, Ecole Polytechnique, Paris, France
  • 3University of Wyoming, Laramie, WY, USA
  • 4Peking University, Beijing, China
  • 5University of Iowa, Iowa City, IA 52242, USA
  • 6National Center for Atmospheric Research, PO Box 3000, Boulder, Colorado 80307-3000, USA

Abstract. BCC-ESM1 is the first version of a fully-coupled Earth System Model with interactive atmospheric chemistry and aerosols developed by Beijing Climate Center, China Meteorological Administration. Major aerosol species (including sulfate, organic carbon, black carbon, dust and sea salt) and greenhouse gases are interactively simulated with a whole panoply of processes controlling emission, transport, gas-phase chemical reactions, secondary aerosol formation, gravitational settling, dry deposition, and wet scavenging by clouds and precipitation. Effects of aerosols on radiation, cloud, and precipitation are fully treated. The performance of BCC-ESM1 in simulating aerosols and their optical properties is comprehensively evaluated as required by the Aerosol Chemistry Model Intercomparison Project (AerChemMIP), covering the preindustrial mean state and time evolution from 1850 to 2014. The simulated aerosols from BCC-ESM1 are quite coherent with CMIP5-recommended data and in-situ measurements from surface networks (such as IMPROVE in the U.S. and EMEP in Europe). A comparison of the aerosol optical depth (AOD) at 550 nm for all aerosols with the satellite AOD observations retrieved from MODIS and MISR and surface AOD observations from AERONET shows reasonable agreement between simulated and observed AOD. However, BCC-ESM1 seems to show weaker upward transport of aerosols from the surface to the middle and upper troposphere, likely reflecting the deficiency of representing deep convective transport of chemical species in BCC-ESM1. With an overall good agreement between BCC-ESM1 simulated and observed aerosol properties, it demonstrates a success of the implementation of interactive aerosol chemistry in BCC-ESM1.

Tongwen Wu et al.
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Short summary
This paper presented descriptions of the first version of Beijing Climate Center (BCC) fully-coupled Earth System Model with interactive atmospheric chemistry and aerosols (BCC-ESM1). It is one version of models in BCC for the Coupled Model Intercomparison Project phase six (CMIP6). The CMIP6 AerChemMIP experiment using BCC-ESM1 has been finished and the simulation data published to ESGF. The performances in simulating aerosols and their optical properties were evaluated.
This paper presented descriptions of the first version of Beijing Climate Center (BCC)...
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