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Overview Differential-Absorption-Lidar (DIAL) in the DLR Falcon aircraft

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) 6. ISTP, Leipzig, 17.9.2003. Overview

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Overview Differential-Absorption-Lidar (DIAL) in the DLR Falcon aircraft

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  1. High Resolution Airborne DIAL Measurements of Water Vapour and Vertical Humidity Fluxes during IHOPChristoph Kiemle, G. Ehret, A. Fix, H. Flentje, G. Poberaj, M. Wirth (DLR)R. M. Hardesty, W. A. Brewer, S. P. Sandberg (NOAA)6. ISTP, Leipzig, 17.9.2003 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

  2. IHOP Objectives and DIAL Performance

  3. On board the DLR Falcon H2O DIAL: Telescope, detectors and passive cooling unit H2O DIAL: Operators’ seat with quick-look display

  4. DIAL System Parameters and Set-up

  5. Falcon payload during IHOP_2002 u,v,w,TAS T,P,q Dropsondes: u,v, P,T,q DIAL: H2O, Aerosols u,v W' HRDL: Horizontal & vertical wind speed

  6. H2O DIAL Comparisons with Dropsondes

  7. High Resolution Backscatter and Water Vapour Cross Section H2O data: 73 m hor. res., 100 m vert. res. in near range, 300 m in far range; overall stat. error 7%

  8. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Water Vapour Spectra and Variance Profile km asl. 3.0 2.5 2.0 2 water vapor variance profile (g/kg) uncorr. stat. err. variance (dashed)

  9. Method for Estimating the Statistical (Random) Error σ2q,instr. σ2q, atmos. Assumption: hor. homogeneity DIAL resolution scaling law

  10. High Resolution Water Vapor and Vertical Wind DLR-DIAL: x = 150 m y = 150 m NOAA-HRDL: x = 150 m y = 150 m

  11. Co-located Airborne Water Vapour and Wind Lidars

  12. Estimation of Latent Heat Flux Profile by Eddy Correlation Flux F = w’q’ q’ = q - q statistical error (solid): σ2F, instr. = Δt/T σ2w atm. σ2q, instr. Ritter et al., JGR, 1990 sampling error (dashed): σ2F, sampling = 2 ISF/T (F2 + σ2w atm. σ2q, atm.) Lenschow and Stankov, JAS, 1986

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