Apogee SP-214 Manuale d'uso - Pagina 15

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Spectral Errors for Shortwave Radiation Measurements with Apogee SP Series Pyranometers

Radiation Source (Error Calculated Relative to Sun, Clear Sky)

Sun (Clear Sky)

Sun (Cloudy Sky)

Reflected from Grass Canopy

Reflected from Deciduous Canopy

Reflected from Conifer Canopy

Reflected from Agricultural Soil

Reflected from Forest Soil

Reflected from Desert Soil

Reflected from Water

Reflected from Ice

Reflected from Snow

Operation of Heater (SP-230)

Apogee model SP-230 pyranometers have an internal heater to allow for sensor heating during precipitation events or under

conditions of dew, frost, and snow deposition. The heater is designed to keep the water (liquid and frozen) off the diffuser,

though it does not need to be used in order to make measurements of shortwave radiation. However, if the diffuser has

water on the surface, errors can result. Continuously powering the heater under conditions that do not require heating will

not damage the sensor or influence measurements.

Spectral error for Apogee SP series

pyranometers as a function of atmospheric

air mass, assuming calibration at an air mass

of 1.5.

Error [%]

0.0

9.6

14.6

16.0

19.2

-12.1

-4.1

3.0

6.6

0.3

13.7