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@INPROCEEDINGS{Riese:1023705,
      author       = {Riese, Martin and Hoor, P. M. and Rolf, Christian and
                      Engel, A. and Grooss, Jens-Uwe and Johansson, S. and
                      Pöhlker, M. L. and Schneider, J. and Tomsche, L. and
                      Ungermann, Jörn and Voigt, Claudia and Zahn, A. and Kunkel,
                      D. and Borrmann, S. and Friedl-Vallon, F. and Hoepfner, M.
                      and Koellner, F. and Rapp, M. and Sinnhuber, B.-M. and von
                      Hobe, Marc and Volk, C. M. and Ziereis, H.},
      title        = {{P}robing {H}igh {L}atitude {E}xport of air from the
                      {A}sian {S}ummer {M}onsoon ({PHILEAS})},
      reportid     = {FZJ-2024-01762},
      year         = {2024},
      abstract     = {The Asian monsoon anticyclone (AMA) during northern summer
                      is thought to be a major contributor for transport of
                      tropospheric air masses, rich in water vapor, aerosol
                      precursors and pollutants, into the UTLS. Recent
                      observations show evidence for a strong contribution of
                      ammonium nitrate transport by the AMA to the UTLS aerosol
                      budget and the Asian Tropopause Aerosol Layer (ATAL), likely
                      relevant for cirrus cloud formation. During the StratoClim
                      and ACCLIP campaigns the composition and aerosol content of
                      the interior of the AMA could be characterized. From
                      previous HALO missions TACTS/ESMVal and WISE a significant
                      impact of the monsoon export on the background composition
                      of the lowermost stratosphere (LMS) was
                      observed.Observations and model simulations suggest that the
                      so-called eddy shedding is of major importance for the
                      export of AMA air masses into the LMS. Particularly, over
                      the northern Pacific dynamical and diabatic forcings lead to
                      a subsequent erosion of these eddies and to mixing into the
                      background lower stratosphere. Furthermore, there is a high
                      potential for impact from the Canadian wild fires on the
                      composition of the UTLS in this region.We will present first
                      results from the PHILEAS mission, which took place between
                      August and October 2023 over Anchorage bracketed by a
                      European measurement phase prior and after the Alaska phase.
                      During PHILEAS, HALO was equipped by a combination of remote
                      sensing and high resolution trace gas instruments as well as
                      aerosol particle composition measurements. Flights covered
                      the northern Pacific and Arctic region as well as the
                      European-Mediterranean sector and the results aim to address
                      the following questions: 1) How do gas-phase and particulate
                      constituents evolve in large-scale eddies which are shed
                      from the monsoon anticyclone? 2) How does eddy shedding from
                      the monsoon impact the extratropical LMS composition in
                      particular the water vapor and radiatively active species?
                      3) What is the large scale impact of the AMA on the LMS
                      background state?},
      month         = {Jan},
      date          = {2024-01-28},
      organization  = {104th AMS American Meteorological
                       Society, Baltimore (USA), 28 Jan 2024 -
                       1 Feb 2024},
      subtyp        = {After Call},
      cin          = {IEK-7},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {2112 - Climate Feedbacks (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2112},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1023705},
}