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dc.contributor.authorClaud, Chantaleng
dc.contributor.authorHeinemann, Guenthereng
dc.contributor.authorRaustein, Elmereng
dc.contributor.authorMcMurdie, Lynneng
dc.date.accessioned2005-01-06T14:23:51Z
dc.date.available2005-01-06T14:23:51Z
dc.date.issued2004eng
dc.PublishedThe Quarterly Journal of the Royal Meteorological Society 2006 130(598): 1075 - 1102en
dc.identifier.issn0035-9009en_US
dc.identifier.urihttps://hdl.handle.net/1956/608
dc.description.abstractA polar low (PL) which occurred in October 1993 over the Norwegian Sea is investigated from an observational and a numerical point of view. This PL has several unique features: it developed early in the season, it lasted for about 3 days, and its trajectory was such that it passed over weather stations so that ‘conventional’ observations of the low are available. The conditions of the formation, development and decay of the PL are investigated using a double approach: satellite data from several instruments are used together to document the mesoscale structure of the low, and two versions of a limited-area model are run to investigate the dynamics of the low. Numerical model fields are compared to quantities derived from TIROS-N Operational Vertical Sounder, the Special Sensor Microwave/Imager, and satellite radar altimeter data. In spite of a better spatial resolution of the models, humidity and surface wind speeds are less organized in the simulations than in satellite retrievals. The number of vertical levels, especially for the lowest layers of the atmosphere, appears to be an essential component for a good simulation of the trajectory of the low. There is, however, good overall agreement between modelled and satellite-derived fields, and the good quality of the simulations allows inferences to be made regarding the essential physical and dynamical processes taking place during the formation and development of the PL. We find that the PL was the result of favourable flow conditions at the surface in the form of a shallow arctic front established south of the ice edge, together with an upper-level potential-vorticity anomaly setting the stage for a positive interaction. Later on, the strong surface sensible- and latent-heat fluxes contributed to the extensive vertical development. This study demonstrates the usefulness of the approach adopted here, which relies not only on simulations but also on observations to get a very complete description of such disturbances.en_US
dc.format.extent8858025 byteseng
dc.format.mimetypeapplication/pdfeng
dc.language.isoengeng
dc.publisherRoyal Meteorological Societyen_US
dc.titlePolar low le Cygne: Satellite observations and numerical simulationsen_US
dc.typeJournal article
dc.identifier.doihttps://doi.org/10.1256/qj.03.72


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