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UV Raman lidar Chilbolton Observatory Review April 2003-2004

UV Raman lidar Chilbolton Observatory Review April 2003-2004. Judith Agnew CCLRC Rutherford Appleton Laboratory Radio Communications Research Unit. Summary of events.

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UV Raman lidar Chilbolton Observatory Review April 2003-2004

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  1. UV Raman lidarChilbolton ObservatoryReview April 2003-2004 Judith Agnew CCLRC Rutherford Appleton Laboratory Radio Communications Research Unit

  2. Summary of events • CWAVE campaign June-July 2003: comparison of UV Raman lidar data with Met Office Radiometrics radiometer and co-located Aberystwyth polarimetric lidar. • Examples of high cirrus cloud. • Laser repair. • Implementation of new data acquisition system.

  3. Lidar, radiometer, radiosonde humidity mixing ratio Average signal in each radiometer range bin during lidar measurement period Lidar Radiometer Radiosonde

  4. Water vapour measurements 13/06/03 Raman lidar Radiometer Difference

  5. Water vapour measurements 25/06/03 Raman lidar Radiometer Difference

  6. High cirrus clouds 07/05/03 09/06/03

  7. Lidar upgrades • New data acquisition system about to be delivered. Installation work to begin immediately, while keeping existing system operational. • Will upgrade the capabilities from 8 bit analog to 12 bit analog and photon counting • Photon counting will improve the measurement of small signals, especially by night. • Higher resolution analog measurements beneficial when photon counting is not suitable, for example by day in the Raman scattering channels. • Laser underwent extensive maintenance and now has much improved beam power.

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