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Energy Balance Estimates of ET Energy Balance Estimates of ET ET is - - PowerPoint PPT Presentation
Energy Balance Estimates of ET Energy Balance Estimates of ET ET is - - PowerPoint PPT Presentation
Energy Balance Estimates of ET Energy Balance Estimates of ET ET is calculated as a component of the energy balance. ET is calculated as a component of the energy balance. ET H = R n - G G - - H = ET R n - : Net surface radiation flux
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ET is calculated as a component of the energy balance. ET is calculated as a component of the energy balance.
R Rn
n -
- G
G -
- H =
H = λ λET ET
R Rn
n : Net surface radiation flux density (Wm
: Net surface radiation flux density (Wm-
- 2
2)
) G : Ground heat flux density (Wm G : Ground heat flux density (Wm-
- 2
2)
) H : Sensible heat flux density (Wm H : Sensible heat flux density (Wm-
- 2
2)
) λ λET : Latent heat flux density (Wm ET : Latent heat flux density (Wm-
- 2
2)
) λ λ : Latent heat of vaporization of water (Jkg : Latent heat of vaporization of water (Jkg-
- 1
1)
)
Energy Balance Estimates of ET Energy Balance Estimates of ET
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Land-Based ET Estimation: Flux Towers
Photos courtesy of James Cleverly, UNM
Salt Cedar Cottonwood
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Photo courtesy of Zohrab Samani, NMSU
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Photos courtesy of Zohrab Samani, NMSU
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Various amounts
- f reflection
Wavelength in Microns
0 0.4 0.6 0.8 1.2 1.6 2.0 2.4 Band: 1 2 3 4 5 7 Visible Near Infrared
Landsat Band 6 is the long-wave “thermal” band and is used for surface temperature
What Landsat Sees
Land Surface
(Slide by Richard Allen and colleagues)
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Slide courtesy of Julie Coonrod, UNM
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Satellite-Based ET Estimation SEBAL Algorithm
Slide courtesy of Jan Hendrickx, New Mexico Tech
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Remote-sensing based ET measurement
Slide courtesy of Jan Hendrickx, New Mexico Tech
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