Institut für Physik der Atmosphäre Institut für Physik der Atmosphäre High Resolution Airborne DIAL Measurements of Water Vapour and Vertical Humidity.

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Presentation transcript:

Institut für Physik der Atmosphäre Institut für Physik der Atmosphäre High Resolution Airborne DIAL Measurements of Water Vapour and Vertical Humidity Fluxes during IHOP Christoph Kiemle, G. Ehret, A. Fix, H. Flentje, G. Poberaj, M. Wirth (DLR) R. M. Hardesty, W. A. Brewer, S. P. Sandberg (NOAA) IHOP Workshop, June 2004, Toulouse Overview Differential-Absorption-Lidar (DIAL) in the DLR Falcon aircraft High resolution water vapour measurements of the boundary layer Co-located wind lidar measurements and vertical humidity fluxes

Institut für Physik der Atmosphäre Oklahoma, May,2002 Focus of the International H 2 O Project IHOP_2002

Institut für Physik der Atmosphäre IHOP Objectives and DIAL Performance

Institut für Physik der Atmosphäre H 2 O DIAL: Operators seat with quick-look display H 2 O DIAL: Telescope, detectors and passive cooling unit On board the DLR Falcon

Institut für Physik der Atmosphäre DIAL System Parameters and Set-up

Institut für Physik der Atmosphäre T,P,q u,v,w,TAS Dropsondes: u,v, P,T,q HRDL: Horizontal & vertical wind speed DIAL: H 2 O, Aerosols W'u,v Falcon payload during IHOP_2002

Institut für Physik der Atmosphäre H 2 O DIAL Comparisons with Dropsondes

Institut für Physik der Atmosphäre 20 Legs Backscatter Ratio on N 115 km from W km asl UT Lidar Movie: Evolution of the Boundary Layer

Institut für Physik der Atmosphäre

Institut für Physik der Atmosphäre

Institut für Physik der Atmosphäre

Institut für Physik der Atmosphäre

Institut für Physik der Atmosphäre High Resolution Backscatter and Water Vapour Cross Section H 2 O data: 73 m hor. res., 100 m vert. res. in near range, 300 m in far range; overall stat. error 7%

Institut für Physik der Atmosphäre Water Vapour Energy Spectra and Variance Profile km asl. water vapor variance profile (g/kg) uncorr. stat. err. variance (dashed)

Institut für Physik der Atmosphäre Method for Estimating the Statistical (Random) Error σ 2 noise σ 2 H2O Assumption: hor. homogeneityDIAL resolution scaling law

Institut für Physik der Atmosphäre Discussion of Systematic Uncertainties Reference profile (SP=95%) with dropsonde and worst case systematic deviations

Institut für Physik der Atmosphäre Summary of DIAL Uncertainties for IHOP 2002

Institut für Physik der Atmosphäre High Resolution Water Vapor and Vertical Wind DLR-DIAL: x = 150 m y = 150 m NOAA-HRDL: x = 150 m y = 150 m

Institut für Physik der Atmosphäre Co-located Airborne Water Vapour and Wind Lidars

Institut für Physik der Atmosphäre Estimation of Latent Heat Flux Profile by Eddy Correlation Flux F = wq q = q - q statistical error (solid): σ 2 F, instr. = Δt/T σ 2 w atm. σ 2 q, instr. Ritter et al., JGR, 1990 sampling error (dashed): σ 2 F, sampling = 2 IS F /T (F 2 + σ 2 w atm. σ 2 q, atm. ) Lenschow and Stankov, JAS, 1986

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