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A new visibility parameterization for warm fog applications in numerical weather prediction models
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 157014
Author(s) Gultepe, I.; Mueller, M. D.; Boybeyi, Z.
Author(s) at UniBasel Müller, Mathias
Year 2006
Title A new visibility parameterization for warm fog applications in numerical weather prediction models
Journal Journal of applied meteorology
Volume 45
Number 11
Pages / Article-Number 1469-1480
Abstract The objective of this work is to Suggest a new warm-fog visibility parameterization scheme for numerical weather prediction (NWP) models. In situ observations collected during the Radiation and Aerosol Cloud Experiment, representing boundary layer low-level clouds, were used to develop a parameterization scheme between visibility and a combined parameter as a function of both droplet number concentration N-d and liquid water content (LWC). The current NWP models usually use relationships between extinction coefficient and LWC. A newly developed parameterization scheme for visibility, Vis = f(LWC, Nd), is applied to the NOAA Nonhydrostatic Mesoscale Model. In this model, the microphysics of fog was adapted from the ID Parameterized Fog (PAFOG) model and then was used in the lower 1.5 km of the atmosphere. Simulations for testing the new parameterization scheme are performed in a 50-km innermost-nested simulation domain using a horizontal grid spacing of 1 km centered on Zurich Unique Airport in Switzerland. The simulations over a 10-h time period showed that visibility differences between old and new parameterization schemes can be more than 50%. It is concluded that accurate visibility estimates require skillful LWC as well as Nd estimates from forecasts. Therefore, the current models can significantly over-/ underestimate Vis (with more than 50% uncertainty) depending on environmental conditions. Inclusion of N-d as a prognostic (or parameterized) variable in parameterizations would significantly improve the operational forecast models.
Publisher American Meteorological Society
ISSN/ISBN 0021-8952
edoc-URL http://edoc.unibas.ch/dok/A5259878
Full Text on edoc No
Digital Object Identifier DOI 10.1175/JAM2423.1
ISI-Number WOS:000242717000001
Document type (ISI) Article
 
   

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