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H.W.J Russchenberg 1 , C.L. Brandau 1 , U. Loehnert 2 and K. Ebell 2

Liquid water clouds in the Murg-valley. H.W.J Russchenberg 1 , C.L. Brandau 1 , U. Loehnert 2 and K. Ebell 2 (1) International Research Centre for Telecommunication and Radar (IRCTR), Delft Technical University, The Netherlands

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H.W.J Russchenberg 1 , C.L. Brandau 1 , U. Loehnert 2 and K. Ebell 2

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  1. Liquid water clouds in the Murg-valley H.W.J Russchenberg1,C.L. Brandau1, U. Loehnert2 and K. Ebell2 (1) International Research Centre for Telecommunication and Radar (IRCTR), Delft Technical University, The Netherlands (2) Institute for Meteorology and Geophysics, University of Cologne, Cologne, Germany

  2. Cloud Radar Microwave Radiometer Cloud radar based retrievals of liquid water content (LWC): In-situ observations Evaluation: Directly: simultaneous measurements of LWC and Z: Fox/Illingworth JPM 1997

  3. Stratocumulus, Murg Valley Radar reflectivity Spectral width Vertical velocity Liquid water path

  4. One hour standard deviation vertical speed

  5. Link with liquid water path

  6. Some cloud statistics, Murg Valley

  7. Radar data analysis: approach, 1 Z LWC ? Comparison of independent techniques

  8. Radar data analysis: approach, 2 Suppose: ? Z LWC Which Z-LWC fits the equation?

  9. Case study: 26 October 2007, COPSLWP(radar)-LWP(radiometer)

  10. Case study: 26 October 2007, COPSRequired Z-LWC relationships

  11. Evaluation of radar-based LWC retrieval in the Murg-valley from April-December single layer, cloud droplets only, LWP(max)=700gm-2, geometrical thickness(min)=2 radar bins (90m), broken clouds included Radar discrepancy

  12. Analysis of cloud structure Effect on the derived LWP from radar-based Z-LWC relationships increase of H results in a greater deviation from LWP(MWR)

  13. Is it always the case? SOP2: 21/07/2007 LWC in-situ (PVM) M M M Combination of different scales Radar reflectivity of 5 height bins due to changes in flight level Z > -50 Z < -17 no drizzle M

  14. Z-LWC relationship from in-situ data: SOP2: 21/07/2007 Z-LWC relationship from Fox/Illingworth and Atlas reproduces (albeit not perfect) radar observation on the ground

  15. Concluding remarks • The observed reflectivity of stratocumulus tends to be less than expected • We are looking for aerosol data • Be careful with aircraft measurements

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