Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Default user image.

Markku Rummukainen

Professor

Default user image.

Trajectory studies of polar stratospheric cloud lidar observations at Sodankyla (Finland) during SESAME : Comparison with box model results of particle evolution

Författare

  • V. Rizi
  • G. Redaelli
  • G. Visconti
  • F. Masci
  • C. Wedekind
  • B. Stein
  • F. Immler
  • B. Mielke
  • P. Rairoux
  • L. Woste
  • M. Del Guasta
  • M. Morandi
  • F. Castagnoli
  • S. Balestri
  • L. Stefanutti
  • R. Matthey
  • V. Mitev
  • M. Douard
  • J. P. Wolf
  • E. Kyro
  • M. Rummukainen
  • R. Kivi
Visa allt

Summary, in English

Polar stratospheric clouds (PSC) were observed with the multi-wavelength lidar of the MOANA project (Modelling and Observations of Aerosols in the Northern Atmosphere) during SESAME (Second European Stratospheric Arctic and Mid-latitude Experiment). The physical state, liquid or solid, of the cloud particles can be inferred from the lidar data. Using isentropic back-trajectories to obtain the thermal history of the sampled air masses, it is possible to reconcile most of the observations with current ideas on PSC formation and evolution. When the cloud particles were identified as liquid, changes in the size distribution of the droplets along the trajectory were calculated using a micro-physical box model. Backscatter ratios calculated from the size distributions are in broad agreement with the lidar data, giving confidence in current understanding of the evolution of ternary solution (H2SO4, HNO3 and H2O) droplets. Results from two soundings are shown which bear on the problem of the formation of solid particles. In the first, solid particles were detected. The air mass had cooled to the frost point 12 hours earlier. In the second no solid particles were detected although the air temperature was below the nitric acid trihydrate existence point, and had decreased by 12 K in the previous 14 hours.

Publiceringsår

1999

Språk

Engelska

Sidor

165-181

Publikation/Tidskrift/Serie

Journal of Atmospheric Chemistry

Volym

32

Dokumenttyp

Artikel i vetenskaplig tidskrift

Förlag

Springer

Nyckelord

  • Air mass trajectories
  • Lagragian model
  • Polar stratospheric clouds

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0167-7764