Penman Analysis data for the 16th June 2008

Group A2David Sherman

Ben ThomasMatthew Weston

•Net Radiance (Rn) = 125.58 Wm-2

•Sensible Heat Flux (H) = 17.15 Wm-2

•Ground Heat Flux (G) = 34.99 Wm-2

•Latent Heat Flux (λE) = 73.44 Wm-2

(Rn-G) 125.58-34.99 = 90.59(H+ λE) 17.15+73.44 = 90.59

0

Air Temperature, Dewpoint and Relative Humidity

02468

1012141618202224262830

14.0 14.1 14.2 14.3 14.4 14.5 14.6 14.7 14.8 14.9 15.0

Time of day (hrs)

Tem

p (

0 C )

0

10

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50

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Rela

tive

hu

mid

ity (

%)

Air temperature

Dewpoint temperature

Relative humidity

Mean temp: 13.71

Day 168

•Temperature (Td) = 17.23 ˚C •Dew point Temperature (Tdew) = 3.60 ˚C

•Bowen Ratio (B) = 0.233521 •H/Rn= 0.136565

•Canopy Resistance (rsc) = 60 sm-1 •Roughness Length (z0) = 0.050 m

•Friction Velocity (U*) = 0.138 m/s

Increasing the value of Canopy Resistance and / or Roughness

Length

•Latent Heat Flux tends to drop as the day progresses as the air becomes warmer and Relative Humidity falls.

-100

-50

0

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1 21 41 61 81 101 121 141 161 181 201 221 241 261 281

Canopy Resistance (s/m)

Flu

xe

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W/m

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LE

H