Detailed modeling of mountain wave PSCs S. Fueglistaler1, S. Buss1, B. P. Luo1, H. Wernli1, H. Flentje2, C. A. Hostetler3, L. R. Poole3, K. S. Carslaw4, and Th. Peter1 1Atmospheric and Climate Science, ETH Zürich, Switzerland 2DLR Oberpfaffenhofen, 82230 Wessling, Germany 3NASA Langley Research Center, Hampton, VA, USA 4School of the Environment, Univ. of Leeds, Leeds, UK
Abstract. Polar stratospheric clouds (PSCs) play a key role in polar ozone
depletion. In the Arctic, PSCs can occur on the mesoscale due to orographically induced gravity waves. Here we present a detailed
study of a mountain wave PSC event on 25-27 January 2000 over Scandinavia. The mountain wave PSCs were intensively observed by
in-situ and remote-sensing techniques during the second phase of the SOLVE/THESEO-2000 Arctic campaign. We use these excellent
data of PSC observations on 3 successive days to analyze the PSCs and to perform a detailed comparison with modeled clouds.
We simulated the 3-dimensional PSC structure on all 3 days with a mesoscale numerical weather
prediction (NWP) model and a microphysical box model (using best available nucleation
rates for ice and nitric acid trihydrate particles). We show that the combined mesoscale/microphysical model is capable of reproducing
the PSC measurements within the uncertainty of data interpretation with respect to spatial dimensions, temporal
development and microphysical properties, without manipulating temperatures or using other tuning parameters.
In contrast, microphysical modeling based upon coarser scale global NWP data,
e.g. current ECMWF analysis data, cannot reproduce observations, in particular the occurrence of
ice and nitric acid trihydrate clouds. Combined mesoscale/microphysical modeling may be used for detailed
a posteriori PSC analysis and for future Arctic campaign flight and mission planning.
The fact that remote sensing alone cannot further constrain model results due to uncertainities in the interpretation of measurements,
underlines the need for synchronous in-situ PSC observations in campaigns.
Citation: Fueglistaler, S., Buss, S., Luo, B. P., Wernli, H., Flentje, H., Hostetler, C. A., Poole, L. R., Carslaw, K. S., and Peter, Th.: Detailed modeling of mountain wave PSCs, Atmos. Chem. Phys., 3, 697-712, doi:10.5194/acp-3-697-2003, 2003.