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Characterising the convective environment with direct measurements of moisture flux from airborne wind and water vapour lidars

Schäfler, Andreas and Kiemle, Christoph and Craig , George and Dörnbrack, Andreas and Rahm, Stephan and Wirth, Martin and Ehret, Gerhard (2009) Characterising the convective environment with direct measurements of moisture flux from airborne wind and water vapour lidars. The International Conference on Alpine Meteorology (ICAM) , 11. - 15. Mai 2009, Rastatt, Germany.

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Abstract

Tropospheric profiles of water vapour and wind were measured with differential absorption lidar (DIAL) and heterodyne detection wind lidar collocated onboard the DLR Falcon research aircraft during the COPS field phase in summer 2007. The DIAL is a new system and operated successfully on three wavelengths (two onlines, one offline at each 50 Hz, 40 mJ) around 935 nm, plus 532 and 1064 nm for aerosol characterisation. With either nadir-viewing or conical scans, the wind lidar observed the wind field below the aircraft. The high resolution lidar profiles resolve the dominant water vapour transport processes both over the complex terrain of the Black Forest and along extended flight legs in upstream regions over south-western Europe. Location and timing of convective initiation depend critically on the structure of the humidity field in the planetary boundary layer. Examples from the measurements will be shown to illustrate the variability and structures in the wind and water vapour fields in the pre-convective and convective environment. The availability of co-located wind and water vapour fields allows the direct calculation of vertical and horizontal moisture fluxes. Depending on the synoptic conditions horizontal and vertical fluxes play an important role for the setup of a convective environment. As minor errors in the model fields may have great impact on the forecast of convection, the observed fluxes will be compared with numerical model output, providing a valuable validation of a key component of the moisture budget.

Document Type:Conference or Workshop Item (Poster)
Title:Characterising the convective environment with direct measurements of moisture flux from airborne wind and water vapour lidars
Authors:
AuthorsInstitution or Email of Authors
Schäfler, AndreasDLR
Kiemle, ChristophDLR
Craig , GeorgeLMU
Dörnbrack, AndreasDLR
Rahm, StephanDLR
Wirth, MartinDLR
Ehret, GerhardDLR
Date:15 May 2009
Keywords:COPS, airborne lidar, DIAL, moisture transport
Event Title:The International Conference on Alpine Meteorology (ICAM)
Event Location:Rastatt, Germany
Event Type:international Conference
Event Dates:11. - 15. Mai 2009
Organizer:DLR,KIT,DWD
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben LIDAR-Forschung und -Entwicklung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Andreas Schäfler
Deposited On:26 Jan 2010 13:55
Last Modified:26 Jan 2010 13:55

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