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@ARTICLE{Shen:1028493,
      author       = {Shen, Fuzhen and Hegglin, Michaela I.},
      collaboration = {Yuan, Yue},
      title        = {{I}mpact of weather patterns and meteorological factors on
                      {PM} 2.5 and {O} 3 responses to the {COVID}-19 lockdown in
                      {C}hina},
      journal      = {Atmospheric chemistry and physics},
      volume       = {24},
      number       = {11},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2024-04645},
      pages        = {6539 - 6553},
      year         = {2024},
      abstract     = {Haze events in the North China Plain (NCP) and a decline in
                      ozone levels in Southern Coast China (SC) from 21 January to
                      9 February 2020 during the COVID-19 lockdown have attracted
                      public curiosity and scholarly attention. Most previous
                      studies focused on the impact of atmospheric chemistry
                      processes associated with anomalous weather elements in
                      these cases, but fewer studies quantified the impact of
                      various weather elements within the context of a specific
                      weather pattern. To identify the weather patterns
                      responsible for inducing this unexpected situation and to
                      further quantify the importance of different meteorological
                      factors during the haze event, two approaches are employed.
                      These approaches implemented the comparisons of observations
                      in 2020 with climatology averaged over the years 2015–2019
                      with a novel structural SOM (self-organising map) model and
                      with the prediction of the “business as usual”
                      (hereafter referred to as BAU) emission strength by the GBM
                      (gradient-boosting machine) model, respectively. The results
                      reveal that the unexpected PM2.5 pollution and O3 decline
                      from the climatology in NCP and SC could be effectively
                      explained by the presence of a double-centre high-pressure
                      system across China. Moreover, the GBM results provided a
                      quantitative assessment of the importance of each
                      meteorological factor in driving the predictions of PM2.5
                      and O3 under the specific weather system. These results
                      indicate that temperature played the most crucial role in
                      the haze event in NCP, as well as in the O3 change in SC.
                      This valuable information will ultimately contribute to our
                      ability to predict air pollution under future emission
                      scenarios and changing weather patterns that may be
                      influenced by climate change.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {2112 - Climate Feedbacks (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2112},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001239202700001},
      doi          = {10.5194/acp-24-6539-2024},
      url          = {https://juser.fz-juelich.de/record/1028493},
}