Geoscience Reference
In-Depth Information
in question 10.
Variable
Units
Site 1
Site 2
Site 3
Average temperature
(
°C
)
23.50
28.20
17.25
Vapor pressure deficit
(kPa)
1.177
2.492
0.770
Modified wind speed
(m/s)
4.19
3.51
3.70
Solar at ground (cloudy sky)
(mm day −1 )
9.14
11.44
6.33
Net longwave
(mm day −1 )
−1.68
−2.44
−1.37
Elevation
(m)
12
44
30
Air pressure
(kPa)
101.16
100.78
100.95
Latent heat
(MJ kg −1 )
2.446
2.434
2.460
Delta
(kPa
°C
−1 )
0.1740
0.2217
0.1243
Psychrometric constant
(kPa
°C
−1 )
0.0672
0.0674
0.0668
Selected value for Albedo
(none)
0.08
0.08
0.08
Net solar radiation
(mm day −1 )
8.41
10.52
5.82
Net radiation
(mm day −1 )
6.72
8.09
4.46
Open water evaporation
(mm day −1 )
7.65
10.63
5.00
Table 26.7(d) Reference crop evaporation using the FAO, radiation-based, temperature-
based and pan-based methods calculated at three Australian sites in question 10.
Variable
Units
Site 1
Site 2
Site 3
Maximum air temperature
(
°C
)
29.10
35.00
23.00
Minimum air temperature
(
°C
)
17.90
21.40
11.50
Average temperature
(
°C
)
23.50
28.20
17.25
Vapor pressure deficit
(kPa)
1.177
2.492
0.770
Modified wind speed
(m s −1 )
4.19
3.51
3.70
Extraterrestrial solar radiation
(mm day −1 )
16.61
16.34
15.68
Net radiation
(mm day −1 )
5.35
6.37
3.51
Assigned site humidity
(none)
Humid
Arid
Humid
Latent heat
(MJ kg −1 )
2.446
2.434
2.460
Delta
(kPa
°C
−1 )
0.1740
0.2217
0.1243
Psychrometric constant
(kPa
°C
−1 )
0.0672
0.0674
0.0668
Measured pan evaportion
(mm)
7.6
11.2
4.9
Value of C p in Equ. (23.24)
(s m −1 )
224
224
224
Value of
(A pan /
A rc )
(none)
1.15
1.15
1.15
Modified psychrometric const.
(kPa
°C −1 )
0.1600
0.1456
0.1484
r clim assigned in Equ. (23.26)
(s m −1 )
40
76
49
Default pan coefficient
(none)
0.88
0.82
0.88
Wind corrected pan factor
(none)
0.77
0.77
0.79
Ref. Crop Evap. (FAO)
(mm day −1 )
5.78
8.62
3.75
Ref. Crop Evap. (radiation based)
(mm day −1 )
4.87
8.50
2.87
Ref. Crop Evap. (temperature based)
(mm day −1 )
5.28
6.38
4.29
Ref. Crop Evap. (pan: default
K p )
(mm day −1 )
6.69
9.18
4.31
Ref. Crop Evap. (pan: wind corr.
K p
)
(mm day −1 )
5.85
8.59
3.87
 
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