Campbell-scientific NR01 Net Radiometer Manual de usuario descargar pdf (Pagina 13)

NR01 Four-Component Net Radiation Sensor

TABLE 2.5-1. Average Global Radiation Values

at the Earth Surface

Type SW

out

net

out

net

Net

Units W/m

W/m

Value 198 - 30 168 324* -390** -66 102

* LW

value assumes a sky temperature of 2ºC.

** LW

out

value assumes a surface temperature of 14ºC.

The LW radiation values in Table 2.5-1 are corrected for sensor

temperature. The values in Table 2.5-2 are not corrected for

sensor temperature.

NOTE

On a smaller timescale, the most important factors are:

• solar position

• cloud cover

The ambient air temperature is less important because cloud base temperature

tends to follow surface temperature.

TABLE 2.5-2. Expected SENSOR Outputs when Measuring with the NR01

D / N

CD / CR

Ambient

air temp.

pyrgeo

down

pyrgeo

pyrano

down

pyrano

sky

ground

°C W/m

W/m

°C °C

D CD +20 0 0 0-500 0-150 20 +20

D CD -20 0 0 0-500 0-150 -20 -20

D CR +20 -70** 0 0-1500 0-400 +1 +20

D CR -20 -70** 0 0-1500 0-400 -50 -20

N CD +20 0 0 0 0 +20 +20

N CD -20 0 0 0 0 -20 -20

N CR +20 -70* 0 0*** 0 1 +20

N CR -20 -70* 0 0*** 0 50 -20

The table makes a distinction between the day and night (D/N), cloudy and

clear (CD / CR) conditions, and high and low ambient air temperatures.

The instrument temperature is normally close to air temperature.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 45 46

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