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Airborne lidar observations in the inflow region of a warm conveyor belt

Schäfler, Andreas und Dörnbrack, Andreas und Wernli, Heini und Kiemle, Christoph und Rahm, Stephan (2011) Airborne lidar observations in the inflow region of a warm conveyor belt. Quarterly Journal of the Royal Meteorological Society, 137, Seiten 1257-1272. American Meteorological Society. DOI: 10.1002/qj.827.

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Warm conveyor belts (WCBs) are key flow structures associated with extratropical cyclones. They transport moist air from the cyclone�s warm sector poleward and upward close to the tropopause level, leading to the formation of elongated cloud bands, intense latentheating and surface precipitation. In this study a comprehensive dataset of airborne lidar observations of moisture andwind fromdifferent campaigns has been investigated with a trajectory-based approach to identify �lucky encounters� with WCBs. On 19 July 2007, an upstream flight over the Iberian Peninsula during the European THORPEX Regional Campaign (ETReC 2007) in Central Europe intersected two WCBs: one in the upper tropospheric outflow region about 3 days after starting the ascent, and the other one in the boundary layer inflow region over Spain justprior to the strong ascent.Comparisonof the lidarhumiditymeasurements with analysis fields from the European Centre forMedium-RangeWeather Forecasts (ECMWF) reveals significant positive deviations, equivalent to an overestimation of the modelled humidity, in this low-tropospheric WCB inflow region (of about 1 g kg�1 (14%) on average and with peak deviations up to 7 g kg�1). It is noteworthy that this substantial bias occurs in a potentially dynamically highly relevant airmass that will be subsequently lifted within aWCBto the upper troposphere.ALagrangian moisture source diagnostic reveals that these largemoisture deviations occur within airmasses that, according to the ECMWF analyses, are coherently transported from the western Mediterranean towards Spain and experience intense moisture uptake over the Ebro valley. It is suggested that inaccuracies in surface evapotranspiration, horizontal moisture advection, and turbulent vertical transport of moisture in the atmospheric boundary layer potentially contribute to the erroneous lowtropospheric humidity in the inflow region of this particular summertime WCB over Spain in theECMWFanalyses.

Titel:Airborne lidar observations in the inflow region of a warm conveyor belt
AutorenInstitution oder E-Mail-Adresse der Autoren
Schäfler, Andreasandreas.schaefler@dlr.de
Dörnbrack, AndreasDLR
Wernli, HeiniETH Zurich, CH
Kiemle, ChristophDLR
Rahm, StephanETH Zurich, CH
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.827
Seitenbereich:Seiten 1257-1272
Verlag:American Meteorological Society
Stichwörter:water vapour; wind; moisture transport; moisture uptake; aircraft observations
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 > Lidar
Hinterlegt von: Andreas Schäfler
Hinterlegt am:25 Jan 2011 09:30
Letzte Änderung:12 Dez 2013 21:14

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