EGU25-14936, updated on 15 Mar 2025
https://doi.org/10.5194/egusphere-egu25-14936
EGU General Assembly 2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Understanding the impacts of climatic background on winter PM2.5 over East Asia
Sunmin Park and Jae-Seung Yoon
Sunmin Park and Jae-Seung Yoon
  • Korea University (mireiyue@gmail.com)

Previous studies have explored the exchange effect between atmospheric condition and PM2.5 variation to understand their relationship. However, most works pay attention to a specific date or month when a severe pollution event happened. East Asia has experienced rapid economic development, well known for extreme PM2.5 concentration events, particularly in winter. In this study, we applied EOF analysis to classify high and low PM2.5 years from 1982-2022. We use three reanalysis data such as NOAA OISST, MERRA2, and ERA5 for sea surface temperature, PM2.5, and climate factors including temperature, precipitation, and winds. The first mode EOF explains winter PM2.5 variation with 55.85% (2nd mode: 18.4% and 3rd mode: 5.6%). The first mode of EOF timeseries indicates eleven high years from 2002 to 2013 and nine low years from 1991 to 1999 (over ±0.5σ). The high PM2.5 events are related to sea surface temperature (PDO-like pattern) and wind over the eastern Pacific. Vertical velocity is not a key factor during the winter but has a weak impact on vertical dispersion.

How to cite: Park, S. and Yoon, J.-S.: Understanding the impacts of climatic background on winter PM2.5 over East Asia, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-14936, https://doi.org/10.5194/egusphere-egu25-14936, 2025.