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@ARTICLE{Wagner:884895,
      author       = {Wagner, Robert and Testa, Baptiste and Höpfner, Michael
                      and Kiselev, Alexei and Möhler, Ottmar and Saathoff, Harald
                      and Ungermann, Jörn and Leisner, Thomas},
      title        = {{H}igh-resolution optical constants of crystalline ammonium
                      nitrate for infrared remote sensing of the {A}sian
                      {T}ropopause {A}erosol {L}ayer},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {262},
      issn         = {1867-8610},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2020-03300},
      pages        = {},
      year         = {2020},
      abstract     = {Infrared spectroscopic observations have shown that
                      crystalline ammonium nitrate (AN) particles are an abundant
                      constituent of the upper tropospheric aerosol layer which is
                      formed during the Asian summer monsoon period, the so-called
                      Asian Tropopause Aerosol Layer (ATAL). At upper tropospheric
                      temperatures, the thermodynamically stable phase of AN is
                      different from that at 298 K, meaning that presently
                      available room-temperature optical constants of AN, that is,
                      the real and imaginary parts of the complex refractive
                      index, cannot be applied for the quantitative analysis of
                      these infrared measurements. In this work, we have retrieved
                      the first low-temperature data set of optical constants for
                      crystalline AN in the 800–6000 cm−1 wavenumber range
                      with a spectral resolution of 0.5 cm−1. The optical
                      constants were iteratively derived from an infrared
                      extinction spectrum of 1 micrometer-sized AN particles
                      suspended in a cloud chamber at 223 K. The uncertainties of
                      the new data set were carefully assessed in a comprehensive
                      sensitivity analysis. We show that our data accurately fit
                      aircraft-borne infrared measurements of ammonium nitrate
                      particles in the ATAL.},
      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},
      doi          = {10.5194/amt-2020-262},
      url          = {https://juser.fz-juelich.de/record/884895},
}