1. Institut für Physik der Atmosphäre Institut für Physik der Atmosphäre High Resolution Airborne DIAL Measurements of Water Vapor 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 Water Vapor Intercomparison Workshop, Boulder, 2.10.2003 Overview Differential-Absorption-Lidar (DIAL) in the DLR Falcon aircraft High resolution water vapour measurements of the boundary layer Evaluation of systematic and statistical uncertainties Co-located wind lidar measurements and vertical humidity fluxes

2. Institut für Physik der Atmosphäre IHOP Objectives and DIAL Performance

3. 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

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

5. 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

6. 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%

7. Institut für Physik der Atmosphäre Water Vapour Spectra and Variance Profile km asl. water vapor variance profile (g/kg) uncorr. stat. err. variance (dashed) 2 3.0 2.5 2.0

8. Institut für Physik der Atmosphäre Method for Estimating the Statistical (Random) Error σ 2 q,instr. σ 2 q, atmos. Assumption: hor. homogeneityDIAL resolution scaling law

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

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

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

12. 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

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

14. 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