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Latent Heat Fluxes over Complex Terrain Measured by Airborne Water Vapour and Wind Lidars

Kiemle, Christoph (2010) Latent Heat Fluxes over Complex Terrain Measured by Airborne Water Vapour and Wind Lidars. Int. Symposium for the Advancement of Boundary Layer Remote Sensing, 28.-30. Juni 2010, Paris, France.

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Abstract

The combination of a water vapour and a wind lidar on an aircraft is an interesting new tool that allows to measure latent heat flux profiles and to portray the small- to mesoscale variability beneath the aircraft trajectory with high accuracy and spatial resolution. During the Convective and Orographically-induced Precipitation Study (COPS) in July 2007 over the Black Forest low mountains range in south-western Germany, a differential absorption lidar (DIAL) and a heterodyne detection Doppler wind lidar were collo-cated onboard the DLR Falcon research aircraft. The DIAL “WALES” is a newly developed four-wavelength system (each 50 Hz, 40 mJ) operating on water va-pour absorption lines of different strengths. For the study of summertime convection initiation over com-plex terrain both airborne lidars were pointed nadir-viewing. From the remotely-sensed wind and water vapour fluctuations in the convective boundary layer, a representative latent heat flux profile can be obtained from a single over-flight of the area under investigation using the eddy-correlation technique. The lidars’ hori-zontal and vertical resolution is 200 m, sufficient to resolve the dominant contributions to the flux, as par-allel higher-resolved in-situ measurements by the DO 128 research aircraft show. Challenges arise due to the fact that the lidar profiles are occasionally inter-rupted by laser readjustment phases and small clouds. The presentation will highlight methodical advances, accuracy assessments, validations by collocated in-situ measurements over the mountains, as well as the study of a post-frontal situation in which the latent heat flux played a key role in humidifying the boundary layer.

Document Type:Conference or Workshop Item (Speech)
Title:Latent Heat Fluxes over Complex Terrain Measured by Airborne Water Vapour and Wind Lidars
Authors:
AuthorsInstitution or Email of Authors
Kiemle, ChristophDLR IPA
Date:June 2010
Status:Published
Keywords:airborne water vapour lidar, latent heat flux
Event Title:Int. Symposium for the Advancement of Boundary Layer Remote Sensing
Event Location:Paris, France
Event Type:international Conference
Event Dates:28.-30. Juni 2010
Organizer:IPSL
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 - Projekt WALES (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr.rer.nat. Christoph Kiemle
Deposited On:06 Dec 2010 17:02
Last Modified:06 Dec 2010 17:02

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