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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-2019-240
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-240
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 28 Oct 2019

Submitted as: model description paper | 28 Oct 2019

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

Development of the global atmospheric general circulation-chemistry model BCC-GEOS-Chem v1.0: model description and evaluation

Xiao Lu1,2, Lin Zhang1, Tongwen Wu3, Michael S. Long2, Jun Wang4, Daniel J. Jacob2, Fang Zhang3, Jie Zhang3, Sebastian D. Eastham5, Lu Hu6, Lei Zhu2,7,8, Xiong Liu7, and Min Wei9 Xiao Lu et al.
  • 1Laboratory for Climate and Ocean-Atmosphere Sciences, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China
  • 2School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
  • 3Beijing Climate Center, China Meteorological Administration, Beijing 100081, China
  • 4University of Iowa, Iowa City, IA 52242, USA
  • 5Laboratory for Aviation and the Environment, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
  • 6Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
  • 7Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
  • 8School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
  • 9National Meteorological Information Center, China Meteorological Administration,Beijing 100871, China

Abstract. Chemistry plays an indispensable role in investigations of the atmosphere, however, many climate models either ignore or greatly simplify atmospheric chemistry, limiting both their accuracy and their scope. We present the development and evaluation of the online global atmospheric chemical model BCC-GEOS-Chem v1.0, coupling the GEOS-Chem chemical transport model (CTM) as an atmospheric chemistry component in the Beijing Climate Center atmospheric general circulation model (BCC-AGCM). The GEOS-Chem atmospheric chemistry component includes detailed tropospheric HOx-NOx-VOC-ozone-bromine-aerosol chemistry and online dry and wet deposition schemes. We then demonstrate the new capabilities of BCC-GEOS-Chem v1.0 relative to the base BCC-AGCM model through a three-year (2012–2014) simulation with anthropogenic emissions from the Community Emissions Data System (CEDS) used in the Coupled Model Intercomparison Project Phase 6 (CMIP6). The model well captures the spatial distributions and seasonal variations in tropospheric ozone, with seasonal mean biases of 0.4–2.2 ppbv at 700–400 hPa compared to satellite observations and within 10 ppbv at the surface-500 hPa compared to global ozonesonde observations. The model has larger high ozone biases over the tropics which we attribute to an overestimate of ozone chemical production. It underestimates ozone in the upper troposphere which likely due to either the use of a simplified stratospheric ozone scheme and/or to biases in estimated stratosphere-troposphere exchange dynamics. The model diagnoses the global tropospheric ozone burden, OH concentration, and methane chemical lifetime to be 336 Tg, 1.16 × 106 molecule cm−3, and 8.3 years, respectively, consistent with recent multi-model assessments. The spatiotemporal distributions of NO2, CO, SO2, CH2O, and aerosols optical depth are generally in agreement with satellite observations. The development of BCC-GEOS-Chem v1.0 represents an important step for the development of fully coupled earth system models (ESMs) in China.

Xiao Lu et al.
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Status: open (until 23 Dec 2019)
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Short summary
This study presents the development and evaluation of a new climate-chemistry model: BCC-GEOS-Chem v1.0, coupling the GEOS-Chem chemical transport model as an atmospheric chemistry component in the Beijing Climate Center atmospheric general circulation model. Three-year (2012-2014) simulation of BCC-GEOS-Chem v1.0 shows that the model well captures the spatiotemporal distributions of tropospheric ozone, other gaseous pollutants and aerosols.
This study presents the development and evaluation of a new climate-chemistry model:...
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