[AAS06-P25] Evaluation of wet deposition process of black carbon in WRF/Chem model during MIRAI Arctic research cruise over high-latitude regions in 2016
Keywords:chemical transport model, wet deposition, Black Carbon
To tackle on this issue, we had conducted model simulations over the Pan-Arctic region using a regional chemical transport model (WRF-Chem version 3.8.1). The initial and lateral boundary conditions for the meteorology and chemical species were taken from NCEP-GFS and MOZART-4, respectively. RACM and GOCART modules were used for the gaseous and aerosol chemistry, with a slightly modification to include OH dependency for the aging and in-cloud wet deposition of BC process based on Liu et al. (2011). Anthropogenic emissions were based on EDGAR 4.2, and the biomass burning were based on the near-real-time version of FINN for each day. A pyro-convection process was also considered for the estimation of vertical profiles of biomass burning emissions. Biogenic emissions of VOCs were estimated by MEGAN 2.1 which is included in the model to use the meteorology and radiation calculated in the model for each time step. Calculated period was from August to October in 2016.
Meteorological field was compared with the observational data from the ship-based observation on R/V Mirai at the Arctic Ocean and Bering Sea. Model generally succeeded to reproduce the temporal variations of meteorological field such as the passage of low pressure systems, though the model tens to underestimate the amount of precipitation. BC concentration in rainwater was also compared with the observed samples during the cruise, and it was found that the model tends to overestimate especially for snowing period.