Evaluation of Model Performance for Forecasting Fine Particle Concentrations in Korea

Young Sung Ghim ； Yongjoo Choi ； Soontae Kim ； Chang Han Bae ； Jinsoo Park ； Hye Jung Shin

《Aerosol and Air Quality Research》 17卷7期 (2017/07) Pp. 1856-1864

https://doi.org/10.4209/aaqr.2016.10.0446

摘要

The performance of a modeling system consisting of WRF model v3.4.1 and CMAQ model v4.7.1 for forecasting fine particle concentrations were evaluated using measurement data at the surface. Twenty-four hour averages of PM_(2.5) and its major components at Bulgwang (located in the northwest of Seoul) during the period February 2012 through January 2013 were compared with predicted concentrations as well as hourly averages of inorganic ions measured at Yongin (located to the southeast of Seoul) in spring 2012. The mean fractional bias (MFB) of -0.37 for PM_(2.5) at Bulgwang fell just outside the goal of -0.3, the level of accuracy that the best model can be achieved. Negative values of MFB, especially in winter, along with the correlation coefficient of 0.61 between measured and predicted concentrations showed that the model performance at Bulgwang was closer to that for Europe than that for North America. However, underestimation of SO_4^(2-) and overestimation of NO_3^- were similarly observed at Bulgwang as in the United States. Although diurnal variations in the measured values showed distinctive features at Yongin according to the classified patterns, most variations in the predicted values typically showed a peak early in the morning followed by an increase at night.

關鍵字

CMAQ/WRF ； Mean fractional bias ； PM_(2.5) ； Major components ； Temporal variations