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Agenda Overview

Study Overview, Data Quality and Coverage Final Presentation, ESTEC, 12.12.2006 Christoph Kiemle, A. Fix, M. Wirth, A. Dörnbrack. Technical Support for the Acquisition of Water Vapour DIAL and Aerosol Measurements: Water Vapour Lidar Experiment WALEX 2005. Agenda Overview.

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Agenda Overview

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  1. Study Overview, Data Quality and CoverageFinal Presentation, ESTEC, 12.12.2006Christoph Kiemle, A. Fix, M. Wirth, A. Dörnbrack Technical Support for the Acquisition of Water Vapour DIAL and Aerosol Measurements: Water Vapour Lidar Experiment WALEX 2005

  2. Agenda Overview • Lidar instrument, • Falcon platform, • flight tracks, • measurements overview, • ECMWF analyses overview.

  3. WALEX 2005: Objectives • Perform long-range lidar measurements in subtropical and tropical regions during transfer flights of the DLR Falcon between Germany and Australia. • Provide backscatter, depolarisation and water vapour vertical cross sections with high spatial resolution. • Analyse dynamical processes with signature in water vapour and aerosol observations with the help of ECMWF analyses. • Estimate extinction coefficients and optical depth for selected cases. • Derive relative level of background radiation. • Deliver data for future performance simulations of space DIAL.

  4. Water Vapour Data Quality Systematic errors ( ~ 5%) • Water vapour absorption line cross section (5 % estimated) • Laser spectral impurity (1 - 2 %) • Atmospheric temperature uncertainty (1 %) • Rayleigh-Doppler absorption line broadening (< 1.5 %) Random error(~10%) • controlled by spatial resolution: trade-off • ~10% for 5 km hor. and 0.5 km vert. res. for nadir direction throughout troposphere • ~10% for 15 km hor. and 0.2 km (near range) to 2 km (far range) vert. res. for zenith pointing • higher in dry regions (strat. intrusions) • lower in humid regions (if online not saturated)

  5. Setup of airborne differential absorption lidar

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

  7. Germany - Australia and all local flights Australia - Germany

  8. WALEX 2005: Transfer Flight Tracks Oberpfaffenhofen Larnaca Dubai Hyderabad Bankok Brunei Darwin SCOUT-O3: Stratospheric-Climate Links with Emphasis on the Upper Troposphere and Lower Stratosphere

  9. Transfer to Darwin, Australia ECMWF model interpolated to Falcon route:H2O (ppmv), pot. temp. (K), hor. wind (m/s)from operational T511/L60 analyses

  10. Transfer to Darwin, Australia Munich Larnaca Dubai Hyderabad Bankok Brunei Darwin 4.11. 2005 4.11. 9.11. 9.11. 12.11.2005

  11. Transfer to Darwin, Australia Munich Larnaca Dubai Hyderabad Bankok Brunei Darwin DIAL ECMWF

  12. Transfer to Darwin, Australia

  13. Transfer back from Australia ECMWF model interpolated to Falcon route:H2O (ppmv), pot. temp. (K), hor. wind (m/s)from operational T511/L60 analyses

  14. Transfer back from Australia Munich Larnaca Dubai Hyderabad Bankok Brunei Darwin 17.12. 2005 16.12. 14.12. 13.12. 10.12.2005

  15. Transfer back from Australia Munich Larnaca Dubai Hyderabad Bankok Brunei Darwin ECMWF DIAL 17.12. 2005 16.12. 14.12. 13.12. 10.12.2005

  16. Transfer back from Darwin, Australia

  17. Both trans-fers:4.-12. Nov. 0510.-17. Dec.05fromECMWFT511L60 LT: 9-12 16-19 10-13 15-19 8-10 14-17 Munich Larnaca Dubai Hyderabad Bankok Brunei Darwin LT: 9-11 9-12 8-11 7-10 12-14 7-10

  18. Summary • Transfer flights to and from Australia: • total ~30 h lidar data = 21.600 km = 74% of total distance. • 9 Local flights with total ~30 h lidar data = 21.600 km. • Zenith pointing during ferry to Australia and all local flights. • Nadir measurements on the ferry back. • Particle backscatter and depolarisation at 532 and 1064 nm. • H2O profiles from 10 to 17 km (upward), 0 to 11 km (downward). • ECMWF model analyses interpolated to flight route: • p, T, H2O, winds, pot. temp., pot. vorticity.

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