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Latent Heat Flux Measurements over Complex Terrain by Airborne Water Vapour and Wind Lidars

Kiemle, Christoph und Wirth, Martin und Fix, Andreas und Rahm, Stephan und Corsmeier, Ulrich und Di Girolamo, Paolo (2011) Latent Heat Flux Measurements over Complex Terrain by Airborne Water Vapour and Wind Lidars. Quarterly Journal of the Royal Meteorological Society, 137, Seiten 190-203. DOI: 10.1002/qj.757.

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Offizielle URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.757/abstract


Vertical profiles of the latent heat flux in a convective boundary layer (CBL) are obtained for the first time over complex terrain with airborne water vapour differential absorption lidar and Doppler wind lidar. During the Convective and Orographically-induced Precipitation Study (COPS) over the Black Forest Mountains in south-western Germany both lidars were installed nadir-viewing onboard the Falcon research aircraft of the Deutsches Zentrum f�¼r Luft- und Raumfahrt (DLR). On 30 July 2007, additional in-situ measurements by the Karlsruhe Institute of Technology (KIT) were performed with a Dornier-128 aircraft that flew below the Falcon. This unique instrument configuration allows to validate the lidar-derived fluxes and to assess lidar-specific issues such as instrument noise and data gaps that impinge on the results. The cospectra of in-situ humidity and vertical velocity peak at wavelengths between 1 - 3 km and reveal that the dominant scales of turbulent transport are larger than 700 m in space. Consequently the airborne lidarsâ�� horizontal and vertical resolution of ~200 m is sufficient to seize most of the flux. The lidar and in-situ fluxes of five collocated 45-km flight legs agree within �±20 %, the average difference over the total distance of 225 km is 3 %. A flux comparison with ground-based water vapour Raman and wind lidars shows agreement within the instrumentsâ�� accuracies under low-wind conditions. All latent heat fluxes vary between 100 - 500 W/m�² in the CBL and have small vertical divergences. Vertical velocity spectra in the mid-CBL enable to estimate the dissipation rate of turbulent kinetic energy that amounts to 5â�¢10-4 m2 s-3 in the Rhine Valley and 10-3 m2 s-3 over the Black Forest Mountains. This new airborne lidar instrumentation proves to be a valuable tool for the study of CBL processes and variability, particularly over complex terrain.

Titel:Latent Heat Flux Measurements over Complex Terrain by Airborne Water Vapour and Wind Lidars
AutorenInstitution oder E-Mail-Adresse der Autoren
Kiemle, ChristophDLR IPA
Wirth, MartinDLR IPA
Fix, AndreasDLR IPA
Rahm, StephanDLR IPA
Corsmeier, UlrichKIT IMK
Di Girolamo, PaoloUni Potenza
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.757
Seitenbereich:Seiten 190-203
Stichwörter:turbulent moisture flux, convective boundary layer, differential absorption lidar
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 - 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 15:00
Letzte Änderung:12 Dez 2013 20:34

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