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@ARTICLE{Fadnavis:851443,
      author       = {Fadnavis, Suvarna and Roy, Chaitri and Chattopadhyay, Rajib
                      and Sioris, Christopher E. and Rap, Alexandru and Müller,
                      Rolf and Kumar, K. Ravi and Krishnan, Raghavan},
      title        = {{T}ransport of trace gases via eddy shedding from the
                      {A}sian summer monsoon anticyclone and associated impacts on
                      ozone heating rates},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {15},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-05090},
      pages        = {11493 - 11506},
      year         = {2018},
      abstract     = {The highly vibrant Asian summer monsoon (ASM) anticyclone
                      plays an important role in efficient transport of Asian
                      tropospheric air masses to the extratropical upper
                      troposphere and lower stratosphere (UTLS). In this paper, we
                      demonstrate long-range transport of Asian trace gases via
                      eddy-shedding events using MIPAS (Michelson Interferometer
                      for Passive Atmospheric Sounding) satellite observations,
                      ERA-Interim reanalysis data and the ECHAM5–HAMMOZ global
                      chemistry-climate model. Model simulations and observations
                      consistently show that Asian boundary layer trace gases are
                      lifted to UTLS altitudes in the monsoon anticyclone and are
                      further transported horizontally eastward and westward by
                      eddies detached from the anticyclone. We present an event of
                      eddy shedding during 1–8 July 2003 and discuss a
                      1995–2016 climatology of eddy-shedding events. Our
                      analysis indicates that eddies detached from the anticyclone
                      contribute to the transport of Asian trace gases away from
                      the Asian region to the western Pacific (20–30°N,
                      120–150°E) and western Africa (20–30°N, 0–30°E).
                      Over the last two decades, the estimated frequency of
                      occurrence of eddy-shedding events is $ ∼ 68\%$
                      towards western Africa and $ ∼ 25\%$ towards the
                      western Pacific.Model sensitivity experiments considering a
                      $10\%$ reduction in Asian emissions of non-methane volatile
                      organic compounds (NMVOCs) and nitrogen oxides (NOx) were
                      performed with ECHAM5–HAMMOZ to understand the impact of
                      Asian emissions on the UTLS. The model simulations show that
                      transport of Asian emissions due to eddy shedding
                      significantly affects the chemical composition of the upper
                      troposphere ( ∼ 100–400hPa) and lower stratosphere
                      ( ∼ 100–80hPa) over western Africa and the western
                      Pacific. The $10\%$ reduction of NMVOCs and NOx Asian
                      emissions leads to decreases in peroxyacetyl nitrate (PAN)
                      $(2\%–10\%$ near 200–80hPa), ozone $(1\%–4.5\%$ near
                       ∼ 150hPa) and ozone heating rates
                      (0.001–0.004Kday−1 near 300–150hPa) in the upper
                      troposphere over western Africa and the western Pacific.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {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},
      UT           = {WOS:000441652600005},
      doi          = {10.5194/acp-18-11493-2018},
      url          = {https://juser.fz-juelich.de/record/851443},
}