Articles | Volume 15, issue 14
Atmos. Chem. Phys., 15, 7753–7763, 2015
https://doi.org/10.5194/acp-15-7753-2015

Special issue: HD(CP)2 Observational Prototype Experiment (AMT/ACP...

Atmos. Chem. Phys., 15, 7753–7763, 2015
https://doi.org/10.5194/acp-15-7753-2015

Research article 16 Jul 2015

Research article | 16 Jul 2015

Water vapour profiles from Raman lidar automatically calibrated by microwave radiometer data during HOPE

A. Foth1, H. Baars2, P. Di Girolamo3, and B. Pospichal1 A. Foth et al.
  • 1Leipzig Institute for Meteorology, University of Leipzig, Leipzig, Germany
  • 2Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 3Scuola di Ingegneria, Università degli Studi della Basilicata, Potenza, Italy

Abstract. In this paper, we present a method to derive water vapour profiles from Raman lidar measurements calibrated by the integrated water vapour (IWV) from a collocated microwave radiometer during the intense observation campaign HOPE in the frame of the HD(CP)2 initiative. The simultaneous observation of a microwave radiometer and a Raman lidar allowed an operational and continuous measurement of water vapour profiles also during cloudy conditions. The calibration method provides results which are in a good agreement with conventional methods based on radiosondes. The calibration factor derived from the proposed IWV method is very stable with a relative uncertainty of 5 %. This stability allows for the calibration of the lidar even in the presence of clouds using the calibration factor determined during the most recent clear sky interval. Based on the application of this approach, it is possible to retrieve water vapour profiles during all non-precipitating conditions. A statistical analysis shows a good agreement between the lidar measurements and collocated radiosondes. The relative biases amount to less than 6.7 % below 2 km.

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We present a method to derive water vapour profiles from Raman lidar measurements calibrated by the integrated water vapour from a collocated microwave radiometer. These simultaneous observations provide an operational and continuous measurement of water vapour profiles. The stability of the calibration factor allows for the calibration of the lidar even in the presence of clouds. Based on this approach, water vapour profiles can be retrieved during all non-precipitating conditions.
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