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@ARTICLE{Hong:911534,
      author       = {Hong, Jin and Wang, Wuke and Bai, Zhixuan and Bian,
                      Jianchun and Tao, Mengchu and Konopka, Paul and Ploeger,
                      Felix and Müller, Rolf and Wang, Hongyue and Zhang,
                      Jinqiang and Zhao, Shuyun and Zhu, Jintao},
      title        = {{T}he {L}ong-{T}erm {T}rends and {I}nterannual
                      {V}ariability in {S}urface {O}zone {L}evels in {B}eijing
                      from 1995 to 2020},
      journal      = {Remote sensing},
      volume       = {14},
      number       = {22},
      issn         = {2072-4292},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2022-04794},
      pages        = {5726 -},
      year         = {2022},
      abstract     = {Tropospheric ozone is an important atmospheric pollutant as
                      well as an efficient greenhousegas. Beijing is one of the
                      cities with the most serious ozone pollution. However,
                      long-term date ofobserved ozone in Beijing are limited. In
                      this paper, we combine the measurements of the
                      In-serviceAircraft for a Global Observing System (IAGOS),
                      ozonesonde observations as well as the recentlyavailable
                      ozone monitoring network observations to produce a unique
                      data record of surface ozone(at 14:00 Beijing time) in
                      Beijing from 1995 to 2020. Using this merged dataset, we
                      investigate thevariability in surface ozone in Beijing on
                      multiple timescales. The long-term change is
                      primarilycharacterized by a sudden drop in 2011–2012 with
                      an insignificant linear trend during the full pe-riod. Based
                      on CAM-chem model simulations, meteorological factors played
                      important roles in the2011–2012 ozone drop. Before and
                      after this sudden drop, ozone levels in Beijing increased
                      signif-icantly by 0.42 ± 0.27 ppbv year − 1 before 2011
                      and 0.43 ± 0.41 ppbv year − 1 after 2013. We alsofound a
                      substantial increase in the amplitude of the ozone annual
                      cycle in Beijing, which has notbeen documented in previous
                      studies. This is consistent with ozone increases in summer
                      and ozonedecreases in winter. In addition, the results by
                      the Ensemble Empirical Mode Decomposition (EEMD)analysis
                      indicate significant interannual variations in ozone levels
                      in Beijing with different timeoscillation periods, which may
                      be associated with natural variabilities and subsequent
                      changes inmeteorological conditions.},
      cin          = {IEK-7},
      ddc          = {620},
      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:000887559900001},
      doi          = {10.3390/rs14225726},
      url          = {https://juser.fz-juelich.de/record/911534},
}