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@ARTICLE{Clemens:907240,
      author       = {Clemens, Jan and Ploeger, Felix and Konopka, Paul and
                      Portmann, Raphael and Sprenger, Michael and Wernli, Heini},
      title        = {{C}haracterization of transport from the {A}sian summer
                      monsoon anticyclone into the {UTLS} via shedding of low
                      potential vorticity cutoffs},
      journal      = {Atmospheric chemistry and physics},
      volume       = {22},
      number       = {6},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2022-01919},
      pages        = {3841 - 3860},
      year         = {2022},
      abstract     = {Air mass transport within the summertime Asian monsoon
                      circulation provides a major source of anthropogenic
                      pollution for the upper troposphere and lower stratosphere
                      (UTLS). Here, we investigate the quasi-horizontal transport
                      of air masses from the Asian summer monsoon anticyclone
                      (ASMA) into the extratropical lower stratosphere and their
                      chemical evolution. For that reason, we developed a method
                      to identify and track the air masses exported from the
                      monsoon. This method is based on the anomalously low
                      potential vorticity (PV) of these air masses (tropospheric
                      low PV cutoffs) compared to the lower stratosphere and uses
                      trajectory calculations and chemical fields from the
                      Chemical Lagrangian Model of the Stratosphere (CLaMS). The
                      results show evidence of frequent summertime transport from
                      the monsoon anticyclone to midlatitudes over the North
                      Pacific, even reaching the high-latitude regions of Siberia
                      and Alaska. Most of the low PV cutoffs related to air masses
                      exported from the ASMA have lifetimes shorter than 1 week
                      (about $90 \%)$ and sizes smaller than $1 \%$ of the
                      Northern Hemisphere (NH) area. The chemical composition of
                      these air masses is characterized by carbon monoxide, ozone,
                      and water vapour mixing ratios at an intermediate range
                      between values typical for the monsoon anticyclone and the
                      lower stratosphere. The chemical evolution during transport
                      within these low PV cutoffs shows a gradual change from the
                      characteristics of the monsoon anticyclone to
                      characteristics of the lower stratospheric background during
                      about 1 week, indicating continuous mixing with the
                      background atmosphere.},
      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:000773769100001},
      doi          = {10.5194/acp-22-3841-2022},
      url          = {https://juser.fz-juelich.de/record/907240},
}