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@ARTICLE{Lee:889375,
      author       = {Lee, K.-O. and Barret, B. and Flochmoen, E. L. and Tulet,
                      P. and Bucci, S. and von Hobe, Marc and Kloss, Corinna and
                      Legras, B. and Leriche, M. and Sauvage, B. and Ravegnani, F.
                      and Ulanovsky, A.},
      title        = {{C}onvective uplift of pullution from the {S}ichuan basin
                      into the {A}sian monsoon anticyclone during the
                      {S}trato{C}lim aircraft campaign},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {2020},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-00258},
      pages        = {581},
      year         = {2020},
      abstract     = {The StratoClim airborne campaign took place in Nepal from
                      27 July to 10 August 2017 to document the physical and
                      chemical properties of the South Asian Upper Troposphere
                      Lower Stratosphere (UTLS) during the Asian Summer Monsoon
                      (ASM). In the present paper, simulations with the Meso-NH
                      cloud-chemistry model at a horizontal resolution of 15 km
                      are performed over the Asian region to characterize the
                      impact of monsoon deep convection on the composition of
                      Asian Monsoon Anticyclone (AMA) and on the formation of the
                      Asian Tropopause Aerosol Layer (ATAL) during the StratoClim
                      campaign. StratoClim took place during a break phase of the
                      monsoon with an intense convective activity over south China
                      and Sichuan. Comparisons between Brightness Temperature (BT)
                      at 10.8 microns observed by satellite sensors and simulated
                      by Meso-NH highlight the ability of the model to correctly
                      reproduce the life cycle of deep convective clouds.
                      Comparison between CO and O3 concentrations from Meso-NH and
                      airborne observations (StratoClim and IAGOS) demonstrates
                      that the model captures most of the observed variabilities.
                      Nevertheless, for both gases, the model tends to
                      overestimate the concentrations and misses some thin CO
                      plumes related to local convective events probably because
                      of a too coarse resolution, but the convective uplift of
                      pollution is very well captured by the model. We have
                      therefore focused on the impact of Sichuan convection on the
                      AMA composition. A dedicated sensitivity simulation showed
                      that the 7 August convective event brought large amounts of
                      CO deep into the AMA and even across the 380 K isentropic
                      level located at 17.8 km. This Sichuan contribution
                      enhanced the CO concentration by $~ 15 \%$ to reach more
                      than 180 ppbv over a large area around 15 km height.
                      Noteworthy, Meso-NH captures the impact of the diluted
                      Sichuan plume on the CO concentration during a StratoClim
                      flight south of Kathmandu highlighting its ability to
                      reproduce the transport pathway of Sichuan pollution.
                      According to the model, primary organic aerosol and black
                      carbon particles originating from Sichuan are transported
                      following the same pathway as CO. The large particles are
                      heavily scavenged within the precipitating part of the
                      convective clouds but remain the most important contributor
                      to the particle mass in the AMA. Over the whole AMA region,
                      the 7 August convective event resulted in a $0.5 \%$
                      increase of CO over the 10–20 km range that lasted about
                      2 days. The impact of pollution uplift from three regions
                      (India, China and Sichuan) averaged over the first 10 days
                      of August has also been evaluated with sensitivity
                      simulations. Even during this monsoon break phase, the
                      results confirm the predominant role of India relative to
                      China with respective contributions of 11 and $7 \%$ to CO
                      in the 10–15 km layer. Moreover, during this period a
                      large part $(35 \%)$ of the Chinese contribution comes
                      from the Sichuan basin alone.},
      cin          = {ICG-1 / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB790 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244)},
      pid          = {G:(DE-HGF)POF3-244},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acp-2020-581},
      url          = {https://juser.fz-juelich.de/record/889375},
}