Articles | Volume 6, issue 3
Atmos. Chem. Phys., 6, 689–696, 2006

Special issue: SAGE III Ozone loss and validation experiment II and the validation...

Atmos. Chem. Phys., 6, 689–696, 2006

  01 Mar 2006

01 Mar 2006

Composition analysis of liquid particles in the Arctic stratosphere under synoptic conditions

C. Weisser1, K. Mauersberger1, J. Schreiner1, N. Larsen2, F. Cairo3, A. Adriani4, J. Ovarlez5, and T. Deshler6 C. Weisser et al.
  • 1Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany
  • 2Danish Meteorological Institute, Copenhagen, Denmark
  • 3Institute for Atmospheric Science and Climate, Consiglio Nazionale delle Ricerche, Rome, Italy
  • 4Institute for Interplanetary Space Physics, Consiglio Nazionale delle Ricerche, Rome, Italy
  • 5Laboratoire de Meteorologie Dynamique, Ecole Polytechnique, Palaiseau, France
  • 6University of Wyoming, Laramie, Wyoming, USA

Abstract. Synoptic scale polar stratospheric clouds (PSCs) that formed without the presence of mountain lee waves were observed in early December 2002 from Kiruna/Sweden using balloon-borne instruments. The physical, chemical, and optical properties of the particles were measured. Within the PSC solid particles existed whenever the temperature was below the equilibrium temperature for nitric acid trihydrate and liquid particles appeared when the temperature fell below an even lower threshold about 3 K above the frost point with solid particles still present. The correlation of liquid supercooled ternary solution aerosols with local temperatures is a pronounced feature observed during this flight; average molar ratios H2O/HNO3 were somewhat higher than predicted by models. In addition HCl has been measured for the first time in liquid aerosols. The chlorine isotope signature served as a unique tool to identify unambiguously HCl dissolved in STS particles. Within a narrow temperature range of about three degrees above the frost point, the measured average amount of HCl in liquid particles is below 1 weight%.

Final-revised paper