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Intrinsic Mechanisms for High-Concentrated PMs in Southern Taiwan: Combined Effects by PBLH, LCFs and Large-Scale Subsidence

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Observational analysis revealed seasonal variations in PM accumulation in Kaohsiung City, indicating crucial roles of subsidence and PBLH.

High PM levels are linked to nighttime offshore winds and suppressed PBL growth, complicating air quality patterns in Kaohsiung City.
The study found that large-scale subsidence inhibits airflow, causing PMs to accumulate despite elevated PBLH during the day.
Data from ERA5 and simulations using the WRF model were employed to analyze relationships between PBLH, LSS, and PM concentrations.
Findings suggest that seasonal differences in PM accumulation are not solely due to wind patterns but also related to thermal variations.

Soong et al. (2025) studied this question.

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Observational analysis revealed seasonal variations in PM accumulation in Kaohsiung City, indicating crucial roles of subsidence and PBLH.