RT Journal Article
T1 Modulation of daily PM_(2.5) concentrations over China in winter by large-scale circulation and climate change
A1 Jia, Zixuan
A1 Ordóñez García, Carlos
A1 Doherty, Ruth M.
A1 Wild, Oliver
A1 Turnock, Steven T.
A1 O'Connor, Fiona M.
AB We use the United Kingdom Earth System Model, UKESM1, to investigate the influence of the winter large-scale circulation on daily concentrations of PM_(2.5) (particulate matter with an aerodynamic diameter of 2.5 µm or less) and their sensitivity to emissions over major populated regions of China over the period 1999–2019. We focus on the Yangtze River delta (YRD), where weak flow of cold, dry air from the north and weak inflow of maritime air are particularly conducive to air pollution. These provide favourable conditions for the accumulation of local pollution but limit the transport of air pollutants into the region from the north. Based on the dominant large-scale circulation, we construct a new index using the north–south pressure gradient and apply it to characterise PM_(2.5) concentrations over the region. We show that this index can effectively distinguish different levels of pollution over YRD and explain changes in PM_(2.5) sensitivity to emissions from local and surrounding regions. We then project future changes in PM_(2.5) concentrations using this index and find an increase in PM_(2.5) concentrations over the region due to climate change that is likely to partially offset the effect of emission control measures in the near-term future. To benefit from future emission reductions, more stringent emission controls are required to offset the effects of climate change.
PB European Geosciences Union
SN 1680-7316
YR 2023
FD 2023-03
LK https://hdl.handle.net/20.500.14352/108650
UL https://hdl.handle.net/20.500.14352/108650
LA eng
NO Jia, Z., Ordóñez, C., Doherty, R. M., Wild, O., Turnock, S. T., and O'Connor, F. M.: Modulation of daily PM2.5 concentrations over China in winter by large-scale circulation and climate change, Atmos. Chem. Phys., 23, 2829–2842, https://doi.org/10.5194/acp-23-2829-2023, 2023.
NO UK Research & Innovation (UKRI)
NO Natural Environment Research Council (NERC)
DS Docta Complutense
RD 13 abr 2025