Putting sensible heat flux measurements into a global context

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Putting sensible heat flux measurements into a
global context

• Todd Albert
• Field Methods
• 6 Dec. 2001

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Outline

• Our measurements
• Global picture
• Land / Ocean
• Regional
• Various surface types
• Factors that contribute to variability

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Mammoth Gulch profile data

• Measured profiles of T and u
• QH from aerodynamic profile method
• QH -cp ra k2 Du DT ln(z2/z1)-2 (FH FM)-1
• Little wind at night,
• Very stable (Rigt0.2)
• 10 hr good fluxes
• Melting snow surface

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Turbulent fluxes
QH -9.2 W m-2 QE 26.5 W m-2
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Global picture
oceans
land
total
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Global picture (cont.)
Annual mean QH by latitude
Data from Sellers (1965).
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Oceans
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Regional US cities
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Regional Arctic
SHEBA (Surface Heat Budget of the Arctic)
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Surfaces melting snow, glacier
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Surfaces bare soil, dry lake bed
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Surfaces corn, irrigated alfalfa
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Factors drought
July 1998, TX OK Drought lt 10 moisture
availability
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Factors drought (cont.)
Eta model soil Temps 312 K in Red R. Valley!
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Factors drought (cont.)
Sensible heat fluxes 40 W m-2 in Red R. Valley
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Factors incoming solar
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Factors urban environments

• Buildings
• Building materials
• Drainage
• Canyon geometry
• Combustion

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Factors suburban vs. rural (?)
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Any Questions?

• (Ill tell you where to stick them)