Woodcock, Deardorff, Grossman Soaring gulls, the convective boundary layer and its similarity...
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Woodcock, Deardorff, GrossmanSoaring gulls, the convective boundary layer and its similarity hypothesis
David FitzjarraldAtmospheric Sciences Research CenterUniversity at Albany, SUNYAlbany, New York, US of A
April 17, 2014
Miller’s air-sea interaction class.
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2006
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Woodcock, 1940
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Laboratory Bénard convection
Woodcock’s idealizations….
“Langmuir lines”—know to seaweed-watching Woodcock
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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
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Woodcock, 1940
T(ocean) – T(air)
U (m
/s) Not soaring
Linear soaring
Circular soaring
How the herring gulls soared
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Woodcock, 1942
T(ocean) – T(air)
U (m
/s)
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Priestley (1957)
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Woodcock, 1975
T(ocean) – T(air)
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Digression about similarity hypotheses in boundary layer meteorology
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•the atmospheric convective boundary layer--w*:
Ultimately, the thermals "know" more about acapping inversion lid than they do about the distance to the surface.
Then the situation issomewhat 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 asthe mixed layer similarity hypothesis
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Wyman-Woodcock expedition to the Caribbean, 1946
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Willis and Deardorff, 1974Convection chamber--water
Heat flux
zi
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Grossman, 1982
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LES simulations of the CBL, Schmidt & Schumann, 1989
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Deardorff, 1982.
T(ocean) – T(air)
Modeling—the first ‘large-eddy’ published simulation….
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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…
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Roll circulations in the ABL.
Spectra
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Cartoon from Roland Stull
Benard convection.
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Station B
2 - 5 km
Hazards of taking measurements in the Rolls
Station A
1-km
RABrown 2004
U
V Mean Flow Hodograph
Z/ 1
2
3
The Mean Wind
The OLE winds
Hodographfrom center zone
Hodographfrom convergent zone
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Morrison et al. 2005
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Liu et al, 2006
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Morrison et al. 2005
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Morrison et al. 2005
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Weckworth et al 1999
Dopper radar investigations of rolls.
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Weckworth (1999)
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Florida, Weckworth et al. 1999
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‘Weckworth (1997(
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