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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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Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Latent Heat Fluxes over Complex Terrain Measured by Airborne Water Vapour and Wind Lidars
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kiemle, ChristophDLR IPA
Datum:Juni 2010
Status:veröffentlicht
Stichwörter:airborne water vapour lidar, latent heat flux
Veranstaltungstitel:Int. Symposium for the Advancement of Boundary Layer Remote Sensing
Veranstaltungsort:Paris, France
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:28.-30. Juni 2010
Veranstalter :IPSL
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Projekt WALES (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Dr.rer.nat. Christoph Kiemle
Hinterlegt am:06 Dez 2010 17:02
Letzte Änderung:06 Dez 2010 17:02

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