Articles | Volume 5, issue 6
Geosci. Model Dev., 5, 1363–1375, 2012
Geosci. Model Dev., 5, 1363–1375, 2012

Model description paper 06 Nov 2012

Model description paper | 06 Nov 2012

Modeling wet deposition and concentration of inorganics over Northeast Asia with MRI-PM/c

M. Kajino1,2, M. Deushi1, T. Maki1, N. Oshima1, Y. Inomata3, K. Sato3, T. Ohizumi3, and H. Ueda4 M. Kajino et al.
  • 1Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine, Tsukuba, 305-0052, Japan
  • 2Pacific Northwest National Laboratory, P.O. Box 999 Richland, WA 99352, USA
  • 3Asia Center for Air Pollution Research, 1182 Sowa, Nishi, Niigata, 950-2144, Japan
  • 4Toyohashi Institute of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi 441-8580, Japan

Abstract. We conducted a regional-scale simulation over Northeast Asia for the year 2006 using an aerosol chemical transport model, with time-varying lateral and upper boundary concentrations of gaseous species predicted by a global stratospheric and tropospheric chemistry-climate model. The present one-way nested global-through-regional-scale model is named the Meteorological Research Institute–Passive-tracers Model system for atmospheric Chemistry (MRI-PM/c). We evaluated the model's performance with respect to the major anthropogenic and natural inorganic components, SO42−, NH4+, NO3, Na+ and Ca2+ in the air, rain and snow measured at the Acid Deposition Monitoring Network in East Asia (EANET) stations. Statistical analysis showed that approximately 40–50 % and 70–80 % of simulated concentration and wet deposition of SO42−, NH4+, NO3and Ca2+ are within factors of 2 and 5 of the observations, respectively. The prediction of the sea-salt originated component Na+ was not successful at near-coastal stations (where the distance from the coast ranged from 150 to 700 m), because the model grid resolution (Δx=60 km) is too coarse to resolve it. The simulated Na+ in precipitation was significantly underestimated by up to a factor of 30.