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KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer.

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Präsentation zum Thema: "KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer."—  Präsentation transkript:

1 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier 4th Symposium on Lidar Atmospheric Applications 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, Ch. Kottmeier and U. Corsmeier Institute for Meteorology and Climate Research, KIT Karlsruhe, Germany

2 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Questions, which will be addressed Is it possible to visualize and identify different entrainment mechanisms in the atmospheric boundary layer? What is the entrainment zone? Are small-scale boundary layer height fluctuations linked to the current wind field? Is there a correlation between entrainment velocity and entrainment zone thickness?

3 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Introduction Using the 2 µm Doppler lidar an aerosol backscatter as well as vertical wind information are available. Small-scale fluctuations Diurnal increase CBL Entrainment 1 hour 5 to 22 UTC We use the CSIP, 2005 data set (gently rolling terrain)

4 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Boundary layer height (BLH) determination 4 +1 automatically working algorithms for high resolution determination using aerosol backscatter information and vertical velocity variance

5 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Visualizing entrainment processes Entrainment at the edges of plumes

6 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Entrainment due to large scale engulfment Visualizing entrainment processes

7 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Concepts of entrainment zone thickness (EZT) Statistical concepts vs transition zone strongly correlated transition zone is mostly wider all approaches show variations during the day, but no typical diurnal cycle

8 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Relationship between EZT and BLH Measured ratios corresponds to ΔhΔh

9 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Relationship between EZT and BLH Δh/h

10 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Correlation vertical wind no simple correlation connecting BLH lifting to updraft and vice versa deformation due to thermals variations reflect processes the air mass experienced upstreams

11 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Entrainment velocity Δh/h

12 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Conclusions It is possible to visualize different entrainment processes using Doppler lidar Statistically concepts and the transition zone concept of the EZT differ but are correlated; mixing, and so entrainment, reaches deeper than varying tops of BLH There is no general relationship between EZT and BLH BLH short-time fluctuations are in principle not linked to the current vertical wind field There is a relationship between entrainment velocity and EZT Results from laboratory studies and simulations were comparable to atmospheric boundary layer measurements

13 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Thanks Thanks for attention. For details please see manuscript.

14 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Additionally information

15 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier BLH from aerosol and turbulence profile

16 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Concepts of EZT Correlation of different statistically concepts (h0,h2 using Percentile analysis and σ z standard deviation) Correlation of statistical concepts and transition zone

17 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Visualizing entrainment processes

18 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Entrainment velocity

19 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Entrainment velocity

20 KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4.4 Short time fluctuations of the convective boundary layer height and entrainment observed with Doppler lidar K. Träumner, A. Wieser, C. Kottmeier and U. Corsmeier Entrainment velocity


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