Publications by authors named "Songyou Hong"
Article Synopsis
- Vertical mixing in the planetary boundary layer (PBL) is essential for understanding surface pollutant levels, but existing PBL models often inaccurately represent vertical mixing at night, leading to inflated pollutant concentrations.
- This study introduces a new method for estimating mixed layer height (MLH) based on the Yonsei University PBL scheme and evaluates its effectiveness by comparing model results with observational data.
- Using the WRF-GC model for simulations during a 2021 air quality campaign in South Korea, the new MLH parameterization significantly improved the accuracy of gas and aerosol predictions, reducing the discrepancy between modeled and observed concentrations for various pollutants.
Recent changes of surface particulate matter (PM) concentration in the Seoul Metropolitan Area (SMA), South Korea, are puzzling. The long-term trend of surface PM concentration in the SMA declined in the 2000s, but since 2012 its concentrations have tended to incline, which is coincident with frequent severe hazes in South Korea. This increase puts the Korean government's emission reduction efforts in jeopardy.
View Article and Find Full Text PDFWe examine the effect of anthropogenic aerosols on the weekly variability of precipitation in Korea in summer 2004 by using Weather Research and Forecasting (WRF) and Community Multiscale Air Quality (CMAQ) models. We conduct two WRF simulations including a baseline simulation with empirically based cloud condensation nuclei (CCN) number concentrations and a sensitivity simulation with our implementation to account for the effect of aerosols on CCN number concentrations. The first simulation underestimates observed precipitation amounts, particularly in northeastern coastal areas of Korea, whereas the latter shows higher precipitation amounts that are in better agreement with the observations.
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