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Woodcock, Deardorff , Grossman Soaring gulls, the convective boundary layer and its similarity hypothesis David Fitzjarrald Atmospheric Sciences Research Center University at Albany, SUNY Albany, New York, US of A dfitzjarrald@albany.edu April 17, 2014 Miller’s air-sea interaction class.

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Woodcock, Deardorff , Grossman


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    1. Woodcock, Deardorff, Grossman Soaring gulls, the convective boundary layer and its similarity hypothesis David Fitzjarrald Atmospheric Sciences Research Center University at Albany, SUNY Albany, New York, US of A dfitzjarrald@albany.edu April 17, 2014 Miller’s air-sea interaction class.

    2. 2006

    3. Woodcock, 1940

    4. Laboratory Bénard convection Woodcock’s idealizations….  “Langmuir lines”—know to seaweed-watching Woodcock

    5. We did not learn about the structure of the convective boundary layer only after computer simulations were available! Habits of convection in laboratory flows Whitehead, 1978

    6. Woodcock, 1940 How the herring gulls soared Not soaring U (m/s) Linear soaring Circular soaring T(ocean) – T(air)

    7. Woodcock, 1942 U (m/s) T(ocean) – T(air)

    8. Priestley (1957)

    9. Woodcock, 1975 T(ocean) – T(air)

    10. Digression about similarity hypotheses in boundary layer meteorology

    11. •the atmospheric convective boundary layer--w*: Ultimately, the thermals "know" more about a capping inversion lid than they do about the distance to the surface. Then the situation is somewhat like convection between two plates. So we perform the similarity analysis using as our fundamental observables zi, (g/Θr)H. What you get is a convective velocity w*. This is known as the mixed layer similarity hypothesis

    12. Wyman-Woodcock expedition to the Caribbean, 1946

    13. Willis and Deardorff, 1974 Convection chamber--water Heat flux zi

    14. Grossman, 1982

    15. LES simulations of the CBL, Schmidt & Schumann, 1989

    16. Deardorff, 1982. Modeling—the first ‘large-eddy’ published simulation…. T(ocean) – T(air)

    17. 5. Professional Affiliations, Honors or Awards   1971 - Editorial Award, American Meteorological Society   1972 - Publications Award, National Center for Atmospheric Research   1973 - Elected a Fellow of the American Meteorological Society   1974 - Second Half-Century Award American          Meteorological Society   1978 - Rossby Research Medal, American Meteorological Society.   1986 - Was elected a Fellow of the American Association for the Advancement of Science James Deardorff, we are finally get to where he already was in 1970….. JD lost interest in meteorology…

    18. Roll circulations in the ABL. Spectra

    19. Cartoon from Roland Stull Benard convection.

    20. Hazards of taking measurements in the Rolls Hodograph from convergentzone Hodograph from center zone 1-km The OLE winds Station A 3 U 2 - 5 km 2 The Mean Wind Z/ 1 Station B V Mean Flow Hodograph RABrown 2004

    21. Morrison et al. 2005

    22. Liu et al, 2006

    23. Morrison et al. 2005

    24. Morrison et al. 2005

    25. Dopper radar investigations of rolls. Weckworth et al 1999

    26. Weckworth (1999)

    27. Florida, Weckworth et al. 1999

    28. ‘Weckworth (1997(