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The mesoscale structure of a polar low: airborne lidar measurements and simulations

Wagner, J.S. und Gohm, A. und Dörnbrack, Andreas und Schäfler, Andreas (2011) The mesoscale structure of a polar low: airborne lidar measurements and simulations. Quarterly Journal of the Royal Meteorological Society, 137, Seiten 1516-1531. American Meteorological Society. DOI: 10.1002/qj.857

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The mesoscale structure of a mature polar low was studied on the basis of high-resolution airborne measurements and numerical modelling. A polar low was measured by light detection and ranging (lidar) and dropsonde observations over the Norwegian Sea on 3 and 4 March 2008. Lidar observations provided cross-sections of water-vapour mixing ratio, backscatter ratio and horizontal wind speed around the polar low and through its centre. Mesoscale structures, such as shallow convection in a cold-air outbreak, a dry intrusion in the eye-like centre of the cyclone and deep convection surrounding it could be identified. Numerical simulations were performed with the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecast System (IFS) and a high-resolution, polar version of the Weather Research and Forecasting (WRF) model. WRF simulations reproduced these structures and showed that the polar low had a warm, upper-level core with descending motions. The eye-like centre had a diameter of about 100�150 km and was characterized by rather stable stratification, horizontally constant potential temperatures and calm winds. Beyond the centre, wind speeds increased rapidly. The observed radial wind and temperature profiles support previous idealized simulations. Several WRF sensitivity tests showed the influence of the initialization time and sensible and latent heat fluxes from the surface on the simulated polar-low development. The polar-low simulations were more accurate in runs starting at the mature stage. Heat fluxes from the surface were important for the polar-low energetics, especially at the final stages.

Titel:The mesoscale structure of a polar low: airborne lidar measurements and simulations
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Wagner, J.S.Univ. Innsbruck, ANICHT SPEZIFIZIERT
Gohm, A.Univ. Innsbruck, ANICHT SPEZIFIZIERT
Schäfler, Andreasandreas.schaefler@dlr.deNICHT SPEZIFIZIERT
Erschienen in:Quarterly Journal of the Royal Meteorological Society
Referierte Publikation:Ja
In Open Access:Nein
In ISI Web of Science:Ja
DOI :10.1002/qj.857
Seitenbereich:Seiten 1516-1531
Verlag:American Meteorological Society
Stichwörter:arctic meteorology, polar lows, aircraft lidar measurements, mesoscale meteorologic modelling
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben LIDAR-Forschung und -Entwicklung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Freund, Jana
Hinterlegt am:20 Sep 2011 12:31
Letzte Änderung:12 Dez 2013 21:22

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