Articles | Volume 5, issue 3
Geosci. Model Dev., 5, 741–760, 2012
Geosci. Model Dev., 5, 741–760, 2012

Model description paper 22 May 2012

Model description paper | 22 May 2012

Implementation and evaluation of online gas-phase chemistry within a regional climate model (RegCM-CHEM4)

A. Shalaby1,2, A. S. Zakey1,2,3, A. B. Tawfik4, F. Solmon1, F. Giorgi1, F. Stordal5, S. Sillman4, R. A. Zaveri6, and A. L. Steiner4 A. Shalaby et al.
  • 1Earth System Physics Group, International Centre for Theoretical Physics, Trieste, Italy
  • 2Egyptian Meteorological Authority (EMA), Cairo, Egypt
  • 3Danish Meteorological Institute (DMI), Copenhagen, Denmark
  • 4Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan, USA
  • 5Department of Geosciences, University of Oslo, Norway
  • 6Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington, USA

Abstract. The RegCM-CHEM4 is a new online climate-chemistry model based on the International Centre for Theoretical Physics (ICTP) regional climate model (RegCM4). Tropospheric gas-phase chemistry is integrated into the climate model using the condensed version of the Carbon Bond Mechanism (CBM-Z; Zaveri and Peters, 1999) with a fast solver based on radical balances. We evaluate the model over continental Europe for two different time scales: (1) an event-based analysis of the ozone episode associated with the heat wave of August 2003 and (2) a climatological analysis of a six-year simulation (2000–2005). For the episode analysis, model simulations show good agreement with European Monitoring and Evaluation Programme (EMEP) observations of hourly ozone over different regions in Europe and capture ozone concentrations during and after the summer 2003 heat wave event. For long-term climate simulations, the model captures the seasonal cycle of ozone concentrations with some over prediction of ozone concentrations in non-heat wave summers. Overall, the ozone and ozone precursor evaluation shows the feasibility of using RegCM-CHEM4 for decadal-length simulations of chemistry-climate interactions.