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@ARTICLE{Gaubert:888364,
      author       = {Gaubert, Benjamin and Emmons, Louisa K. and Raeder, Kevin
                      and Tilmes, Simone and Miyazaki, Kazuyuki and Arellano Jr.,
                      Avelino F. and Elguindi, Nellie and Granier, Claire and
                      Tang, Wenfu and Barré, Jérôme and Worden, Helen M. and
                      Buchholz, Rebecca R. and Edwards, David P. and Franke,
                      Philipp and Anderson, Jeffrey L. and Saunois, Marielle and
                      Schroeder, Jason and Woo, Jung-Hun and Simpson, Isobel J.
                      and Blake, Donald R. and Meinardi, Simone and Wennberg, Paul
                      O. and Crounse, John and Teng, Alex and Kim, Michelle and
                      Dickerson, Russell R. and He, Hao and Ren, Xinrong and
                      Pusede, Sally E. and Diskin, Glenn S.},
      title        = {{C}orrecting model biases of {CO} in {E}ast {A}sia: impact
                      on oxidant distributions during {KORUS}-{AQ}},
      journal      = {Atmospheric chemistry and physics},
      volume       = {20},
      number       = {23},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2020-04870},
      pages        = {14617 - 14647},
      year         = {2020},
      abstract     = {Global coupled chemistry–climate models underestimate
                      carbon monoxide (CO) in the Northern Hemisphere, exhibiting
                      a pervasive negative bias against measurements peaking in
                      late winter and early spring. While this bias has been
                      commonly attributed to underestimation of direct
                      anthropogenic and biomass burning emissions, chemical
                      production and loss via OH reaction from emissions of
                      anthropogenic and biogenic volatile organic compounds (VOCs)
                      play an important role. Here we investigate the reasons for
                      this underestimation using aircraft measurements taken in
                      May and June 2016 from the Korea–United States Air Quality
                      (KORUS-AQ) experiment in South Korea and the Air Chemistry
                      Research in Asia (ARIAs) in the North China Plain (NCP). For
                      reference, multispectral CO retrievals (V8J) from the
                      Measurements of Pollution in the Troposphere (MOPITT) are
                      jointly assimilated with meteorological observations using
                      an ensemble adjustment Kalman filter (EAKF) within the
                      global Community Atmosphere Model with Chemistry (CAM-Chem)
                      and the Data Assimilation Research Testbed (DART). With
                      regard to KORUS-AQ data, CO is underestimated by $42 \%$
                      in the control run and by $12 \%$ with the MOPITT
                      assimilation run. The inversion suggests an underestimation
                      of anthropogenic CO sources in many regions, by up to
                      $80 \%$ for northern China, with large increments over the
                      Liaoning Province and the North China Plain (NCP). Yet, an
                      often-overlooked aspect of these inversions is that
                      correcting the underestimation in anthropogenic CO emissions
                      also improves the comparison with observational O3 datasets
                      and observationally constrained box model simulations of OH
                      and HO2. Running a CAM-Chem simulation with the updated
                      emissions of anthropogenic CO reduces the bias by $29 \%$
                      for CO, $18 \%$ for ozone, $11 \%$ for HO2, and
                      $27 \%$ for OH. Longer-lived anthropogenic VOCs whose
                      model errors are correlated with CO are also improved, while
                      short-lived VOCs, including formaldehyde, are difficult to
                      constrain solely by assimilating satellite retrievals of CO.
                      During an anticyclonic episode, better simulation of O3,
                      with an average underestimation of 5.5 ppbv, and a
                      reduction in the bias of surface formaldehyde and oxygenated
                      VOCs can be achieved by separately increasing by a factor of
                      2 the modeled biogenic emissions for the plant functional
                      types found in Korea. Results also suggest that controlling
                      VOC and CO emissions, in addition to widespread NOx
                      controls, can improve ozone pollution over East Asia.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33414818},
      UT           = {WOS:000595073000003},
      doi          = {10.5194/acp-20-14617-2020},
      url          = {https://juser.fz-juelich.de/record/888364},
}