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Impact of boundary layer schemes in RegCM-Chem on East Asian climate and its response to the aerosol-radiation interaction
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DOI：10.1016/j.atmosres.2026.108951.png)
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Abstract
En 中文
This study evaluates the Holtslag (Hol) and University of Washington (UW) planetary boundary layer schemes in RegCM-Chem to better understand the uncertainties of aerosol-radiation interactions (ARIs) over East Asia. Both schemes can reproduce the spatiotemporal variations in climate variables, and UW aligns better with observations for near-surface temperature, humidity, and wind speed. Compared with the Hol scheme, the UW scheme generally produces greater total cloud cover (exceeding the Hol scheme by up to 10%), accompanied by lower surface temperatures, a shallower boundary layer height (PBLH), and a drier surface in the central to eastern region. Owing to weaker wet removal, a lower PBLH and stronger convergence, the UW scheme produces higher surface anthropogenic aerosol concentrations in the central and eastern coastal regions. However, the Hol scheme produces higher dust surface concentrations from stronger emissions. Enhanced vertical transport in the UW scheme elevates aerosols aloft, leading to higher vertical aerosol concentrations and optical depth. Similarly, aerosol loadings from the UW scheme are much closer to observations or reanalysis products. Therefore, the UW scheme produces a stronger surface ERF, with values in the central to eastern region reaching -7.86 W/m2, which is approximately 1.1 W/m2 stronger than those from the Hol scheme. These differences in climate variables and radiative effects further modulate the ARI and regional climate responses. Overall, the Hol scheme might underestimate the climate response to the ARI over East Asia. These results highlight that the choice of boundary layer parameterization is of great importance for reliable regional climate assessment and aerosol impact studies.
Keywords:
Planetary boundary layer
East Asian climate
Aerosol-radiation interaction
Climate effect
RegCM-Chem
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1.1K
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