Start Submission Become a Reviewer

Reading: Doppler lidar studies of heat island effects on vertical mixing of aerosols during SAMUM–2

Download

A- A+
Alt. Display

Original Research Papers

Doppler lidar studies of heat island effects on vertical mixing of aerosols during SAMUM–2

Authors:

Ronny Engelmann ,

Leibniz Institute for Tropospheric Research, DE
X close

Albert Ansmann,

Leibniz Institute for Tropospheric Research, DE
X close

Stefan Horn,

Leibniz Institute for Tropospheric Research, DE
X close

Patric Seifert,

Leibniz Institute for Tropospheric Research, DE
X close

Dietrich Althausen,

Leibniz Institute for Tropospheric Research, DE
X close

Matthias Tesche,

Leibniz Institute for Tropospheric Research, DE
X close

Michael Esselborn,

European Southern Observatory (ESO), DE
X close

Julia Fruntke,

German Meteorological Service, Regional- und Seewetterzentrale Hamburg, DE
X close

Kirsten Lieke,

Institute for Applied Geosciences, Technical University Darmstadt, DE
X close

Volker Freudenthaler,

Meteorological Institute, Ludwig-Maximilians-Universität, DE
X close

Silke Gross

Meteorological Institute, Ludwig-Maximilians-Universität, DE
X close

Abstract

A wind Doppler lidar was deployed next to three aerosol lidars during the SAMUM–2 campaign on the main island of Cape Verde. The effects of the differential heating of the island and the surrounding ocean and the orographic impact of the capital island Santiago and the small island on its luv side, Maio, are investigated. Horizontal and vertical winds were measured in the disturbed maritime boundary layer and compared to local radiosoundings. Lidar measurements from the research aircraft Falcon and a 3-D Large Eddy Simulation (LES) model were used in addition to study the heating effects on the scale of the islands. Indications are found that these effects can widely control the downward mixing from greater heights to the surface of African aerosols, mainly Saharan dust and biomass-burning smoke, which were detected in a complex layering over the Cape Verde region.

How to Cite: Engelmann, R., Ansmann, A., Horn, S., Seifert, P., Althausen, D., Tesche, M., Esselborn, M., Fruntke, J., Lieke, K., Freudenthaler, V. and Gross, S., 2011. Doppler lidar studies of heat island effects on vertical mixing of aerosols during SAMUM–2. Tellus B: Chemical and Physical Meteorology, 63(4), pp.448–458. DOI: http://doi.org/10.1111/j.1600-0889.2011.00552.x
1
Views
1
Downloads
  Published on 01 Jan 2011
 Accepted on 12 May 2011            Submitted on 23 Nov 2010

References

  1. Althausen , D. , Muller , D. , Ansmann , A. , Wandinger , U. , Hube , H. and co-authors . 2000 . Scanning 6-wavelength 11-channel aerosol lidar. J. Atmos. Oceanic TechnoL 17 , 1469 - 1482 .  

  2. Ansmann , A. , Tesche , M. , Seifert , R , Althausen , D. , Engelmann , R. and co-authors . 2009a . Evolution of the ice phase in tropical altocumulus: SAMUM lidar observations over Cape Verde. J. Geophys. Res . 114 , D17208 , doi: https://doi.org/10.1029/2008JDO11659 .  

  3. Ansmann , A. , Tesche , M. , Knippertz , P. , Bierwirth , E. , Althausen , D. and co-authors . 2009b . Vertical profiling of convective dust plumes in southern Morocco during SAMUM. Tellus 61B , 340 - 353 .  

  4. Ansmann , A. , Fruntke , J. and Engelmann , R . 2010 . Updraft and down-draft characterization with Doppler lidar: cloud-free versus cumuli-topped mixed-layer . Atmos. Chem. Phys . 10 , 7845 – 7858 .  

  5. Ansmann , A. , Petzold , A. , Kandler , K. , Tegen , I. , Wendisch , M. and co-authors . 2011 . Saharan Mineral Dust Experiments SAMUM-1 and SAMUM-2: what have we learned? Tellus 63B, this issue.  

  6. van As , D. , van den Broeke , M. and Helsen , M . 2006 . Structure and dynamics of the summertime atmospheric boundary layer over the Antarctic Plateau: 1. Measurements and model validation . J. Geophys. Res . 111 , D07102 , doi: https://doi.org/10.1029/2005JD006956 .  

  7. Browning , K. A. and Wexler , R . 1968 . The determination of kinematic properties of a wind field using Doppler radar . J. AppL Meteorol . 7 , 105 – 113 .  

  8. Carbone , R. E. , Wilson , J. W. , Keenan , T. D. and Hacker , J. M . 2000 . Tropical island convection in the absence of significant topography. Part I: life cycle of diurnally forced convection. Mon . Weather Rev . 128 , 3459 – 3480 .  

  9. Carlis , D. L. , Chen , Y.-L. and Morris , V. R . 2010 . Numerical simula-tions of island-scale airflow over Maui and the Maui vortex under summer trade wind conditions . Mon. Weather Rev . 138 ( 7 ), 2706 – 2736 .  

  10. Caya , D. and Zawadzki , I . 1992 . VAD analysis of nonlinear wind fields . J. Atmos. Oceanic TechnoL 9 , 575 – 587 .  

  11. Engelmann , R . 2010 . Aerosol vertical exchange in the convective planetary boundary layer: Turbulent particle flux measurements with combined wind and aerosol lidar , PhD Thesis, University of Leipzig, Germany, 135 pp.  

  12. Engelmann , R. , Wandinger , U. , Ansmann , A. , Muller , D ., Zeromskis, E. and co-authors . 2008 . Lidar observations of the vertical aerosol flux in the planetary boundary layer . J. Atmos. Oceanic TechnoL 25 ( 8 ), 1296 - 1306 .  

  13. Esselborn , M. , Wirth , M. , Fix , A. , Tesche , M. and Ehret , G . 2008 . Air-borne high spectral resolution lidar for measuring aerosol extinction and backscatter coefficients . AppL Opt . 47 ( 3 ), 346 – 358 .  

  14. Gallus , W. A. and Klemp , J. B . 2000 . Behavior of flow over step orog-raphy. Mon . Weather Rev . 128 , 1153 – 1164 .  

  15. Groß , S. , Tesche , M. , Freudenthaler , V , Toledano , C. , Wiegner , M. and co-authors . 2011a . Characterization of Saharan dust, marine aerosols and mixtures of biomass burning aerosols and dust by means of multi-wavelength depolarization and Raman lidar measurements during SAMUM-2. Tellus 63B, this issue.  

  16. Groß , S. , Gasteiger , J. , Freudenthaler , V. , Wiegner , M ., Ge113, A. and co-authors . 2011b . Characterization of the planetary boundary layer during SAMUM-2 by means of lidar measurements. Tellus 63B, this issue.  

  17. Heese , B. , Althausen , D. , Dinter , T. , Esselborn , M. , Muller , T. and co-authors . 2009 . Vertically resolved dust optical properties dur-ing SAMUM: Tinfou compared to Ouarzazate. Tellus B 61 , 195 - 205 .  

  18. Hinneburg , D. and Knoth , O . 2005 . Non-dissipative cloud transport in Eulerian grid models by the volume-of-fluid (VOF) method . Atmos. Environ . 39 ( 23-24 ), 4321 – 4330 .  

  19. Knippertz , R , Tesche , M. , Heinold , B. , Kandler , K. , Toledano , C. and co-authors . 2011 . Dust mobilization and aerosol transport from West Africa to Cape Verde: a meteorological overview of SAMUM-2. Tellus 63B, this issue.  

  20. Lenschow , D. and Stephens , P . 1982 . Mean vertical velocity and turbu-lence intensity inside and outside thermals . Atmos. Environ. (1967) 16 ( 4 ), 761 – 764 .  

  21. Lieke , K. , Kandler , K. , Scheuvens , D. , Emmel , C. , von Glahn , C. and co-authors . 2011 . Particle chemical properties in the vertical column based on aircraft observations in the vicinity of Cape Verde islands. Tellus 63B, this issue.  

  22. Minda , H. , Furuzawa , F. A. , Satoh , S. and Nakamura , K . 2010 . Convective boundary layer above a subtropical island observed by C-band radar and interpretation using a cloud resolving model . J. Meteorol. Soc. Japan 88 ( 3 ), 285 – 312 .  

  23. Petzold , A. , Veira , A. , Mund , S. , Esselborn , M. , Kiemle , C. and co-authors . 2011 . Mixing of mineral dust with urban pollution aerosol over Dakar (Senegal): impact on dust physico-chemical and radiative properties. Tellus 63B, this issue.  

  24. Savijärvi , H. and Matthews , S . 2004 . Flow over small heat islands: a numerical sensitivity study . J. Atmos. Sci . 61 ( 7 ), 859 – 868 .  

  25. Seifert , A. and Beheng , K. D . 2006 . A two-moment cloud microphysics parameterization for mixed—phase clouds. Part I: model description . Meteorol. Atmos. Phys . 92 , 45 – 66 .  

  26. Slcamarock , W. C. and Klemp , J. B . 1992 . The stability of time-split numerical methods for the hydrostatic and the nonhydrostatic elastic equations. Mon . Wea. Rev . 120 , 2109 – 2127 .  

  27. Slcamarock , W. C. , Dudhia , J. , Gill , D. , Barker , D. , Wei , W. and Powers , J . 2005 . A description of the advanced research WRF version 2, Technical Report NCAR Tech. Note NCAR/TN-468±STR, National Center for Atmospheric Research, Boulder, CO. 88 pp.  

  28. Tesche , M. , Ansmann , A. , Muller , D. , Althausen , D. , Mattis , I. and co-authors . 2009 . Vertical profiling of Saharan dust with Raman lidars and airborne HSRL in southern Morocco during SAMUM. Tellus 61B , 144 - 164 .  

  29. Tesche , M ., Grofs , S. , Ansmann , A. , Muller , D. , Althausen , D. and co-authors . 2011a . Profiling of Saharan dust and biomass-burning smoke with multiwavelength polarization Raman lidar at Cape Verde. Tellus 63B, this issue.  

  30. Tesche , M. , Muller , D ., Grofs , S. , Ansmann , A. , Althausen , D. and co-authors . 2011b . Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements. Tellus 63B, this issue.  

  31. Toledano , C. , Wiegner , M ., Grofs , S. , Freudenthaler , V. , Gasteiger , J. and co-authors . 2011 . Optical properties of aerosol mixtures derived from sun—sky radiometry during SAMUM-2. Tellus 63B, this issue.  

  32. Weinzierl , B. , Sauer , D. , Esselborn , M. , Petzold , A. , Veira , A. and co-authors . 2011 . Microphysical and optical properties of dust and tropical biomass burning aerosol layers in the Cape Verde region: an overview of the airborne in-situ and lidar measurements during SAMUM-2. Tellus 63B, this issue.  

  33. Wood , R. and Bretherton , C. S . 2004 . Boundary layer depth, entrainment, and decoupling in the cloud-capped subtropical and tropical marine boundary layer . J. Clim . 17 ( 18 ), 3576 – 3588 .  

comments powered by Disqus