Long-range air pollution transport in East Asia during the first week of the COVID-19 lockdown in China
Fecha
2020Autor
Miles Griffith, Stephen
Huang, Wei-Syun
Lin, Chia-Ching
Chen, Ying-Chieh
Chang, Kuo-En
Lin, Tang-Huang
Wang, Sheng-Hsiang
Lin, Neng-Huei
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Resumen
Long-range transport (LRT) of air pollutants from East Asia during the northeast monsoon season impacts several
downwind locations. In 2020, the initial COVID-19 lockdowns in China overlapped with Week 3 of the Chinese
New Year (CNY) holiday, and an Asian outflow event. Thus, movement of the Chinese populace from city to
city was already greatly reduced by the time of the LRT episode, although the reductions in industrial output
are less clear. We found NO2 column concentrations were reduced by 24% during the CNY Week 3 this year compared to previous years. The attenuated transport event arrived to northern Taiwan with a PM2.5 concentration
b45 μg m−3 and most often b35 μg m−3
, which is 2–3 times lower than LRT episodes of similar back-trajectory
and synoptic patterns. The whole episode persisted for about 60 h, longer than most LRT episodes from China
to Taiwan. CMAQ v5.2.1 modeling of the LRT event with 100% emission and reduced emission scenarios, revealed
emissions in China were approximately 50% less than normal periods. Due to the length of the episode and the
significant reduction in emissions, Taiwan avoided a PM2.5 surplus of 19.2 μg m−3 on average during the episode,
equivalent to a 0.5 μg m−3 reduction for the whole 3-month winter season. Employing the 100% emission model
scenario and scaling up to the average episode hours each winter, the PM2.5 surplus delivered via plumes on the
northeast monsoon is equivalent to a 0.5 μg m−3 surplus for the whole year.
Palabras clave
Transboundary aerosol; Taiwan; Shutdown; Emissions reduction; CMAQ; PM2.5Enlace al recurso
https://doi.org/10.1016/j.scitotenv.2020.140214Colecciones
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