POLIS – Portable Lidar System High Resolution Cloud Top Height Measurements using an Airborne Lidar System during BBC 2 Campaign May 2003 Birgit Heese.

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Presentation transcript:

POLIS – Portable Lidar System High Resolution Cloud Top Height Measurements using an Airborne Lidar System during BBC 2 Campaign May 2003 Birgit Heese Meteorological Institute University of Munich (MIM)

Airborne campaign BBC 2 onbord the Do 228 (NERC) in collaboration with FU Berlin May 5 – 10, 2003 POLIS – Portable Lidar System

High resolution cloud top height measurements Single pulse measurements were performed at a repetition frequency of the laser of 5 Hz horizontal resolution is about 16 m (plane velocity ~ 80 m/s) vertical resolution of 7.5 m POLIS – Portable Lidar System

Single pulse lidar profile POLIS – Portable Lidar System Cloud top height at a distance of 1227 m from the plane flight level The lidar signal is not range corrected!

Single pulse lidar profile POLIS – Portable Lidar System Ground return of the lidar signal at a distance of 3646 m from the plane Cloud top height from former picture is at 2369 m flight level The lidar signal is not range corrected!

Available Datasets Flights took place on May 6, 7, and 10, 2003 May 6: 14:06:37:36 – 14:31:04:77 (1 pulse) May 7: 11:40:48 – 11:47:40 (200 pulses) Aerosol measurements 12:34:32 – 13:18:56 (200 pulses) 13:23:58:16 – 14:34:33:56 (1 pulse) May 10: 12:22:26:10 – 12:22:35:32 (1 pulse) 12:35:32:25 – 14:48:34:09 (1 pulse) 2nd flight: 16:22:27:47 – 17:05:08:41 (1 pulse) POLIS – Portable Lidar System

Some views out of the plane Cabauw site Clouds on May 10, 2003 POLIS – Portable Lidar System

Lidar Backscatter Signal on May 10, 2003 POLIS – Portable Lidar System 1000 profiles: Not all details are resolved These lidar signals are range-corrected! flight level !

Lidar Backscatter Signal – Cloud Top Height POLIS – Portable Lidar System 200 profiles

Flying into a cloud POLIS – Portable Lidar System flight level !

Data Type Calculation of the cloud top height from Lidar profiles and navigation data (flight altitude, coordinates) will be stored in the database Quicklook plots in the form as shown in this presenstation can also be provided. Lidar profiles themselves are not of much use for the BBC community If there are any other requirements, please write to: POLIS – Portable Lidar System

Acknowledgements MIM: Volker Freudenthaler, Miriam Kosmale, Anton Lex, Meinhard Seefeldner, Matthias Wiegner FU Berlin: Thomas Ruhtz Marc Schröder NERC: Carl Joseph Adam Edgar POLIS – Portable Lidar System