Performance comparison of CMAQ and CAMx for one-year PM_2.5 simulation in Japan
by Hikari Shimadera; Tatsuya Kojima; Akira Kondo; Yoshio Inoue
International Journal of Environment and Pollution (IJEP), Vol. 57, No. 3/4, 2015

Abstract: This study evaluated one-year performance of the community multiscale air quality (CMAQ) model v5.0.1 and the comprehensive air quality model with extensions (CAMx) v6.00. One-year air quality simulations were conducted with common input meteorology, emission and boundary concentration data in the Kinki region of Japan. CAMx-simulated ground-level concentrations were generally higher by 10%-20% than CMAQ-simulated values. Despite the systematical difference, the overall one-year performances of the two models for simulating ground-level concentrations were similar to each other according to comparisons with observed data. The two models approximately reproduced mass concentrations of fine particulate matter (PM_2.5), but shared common difficulties in simulating PM_2.5 components. The models substantially underestimated organic aerosol, which was compensated by overestimate of dust transported from the Asian continent. In addition, the systematical difference between the CMAQ- and CAMx-simulated ground-level PM_2.5 concentrations was mainly attributed to the treatment of the vertical diffusivity and the below-cloud scavenging.

Online publication date: Tue, 02-Feb-2016

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