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Pyrgeometer Energy Balance: Equations and Setup

Learn about pyrgeometer energy balance equations for retrieving longwave irradiance and the differences between shaded and unshaded pyrgeometers. Explore various radiometric models and calibration residuals. This tutorial is part of the IPC-XI Pyrgeometer Intercomparison.

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Pyrgeometer Energy Balance: Equations and Setup

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  1. IPC-XITutorial Pyrgeometer

  2. Contents • Pyrgeometer energy balance • Equations for retrieving longwave irradiance • Shaded versus unshaded pyrgeometers

  3. Pyrgeometer setup

  4. Pyrgeometer energy balance Kipp&Zonen CG4 Eppley PIR

  5. Pyrgeometer equations • Several choices for the radiometric model of a pyrgeometer: Simple Albrecht formula Extended Albrecht (PMOD) NREL formula Fit parameters

  6. Calibration residuals versus WISG

  7. Calibration residuals versus WISGresults from 50 Instruments

  8. Shaded versus unshaded Pyrgeometers

  9. Shaded pyrgeometers

  10. Unshaded pyrgeometers 1 Dome YSI NIGHT

  11. Unshaded pyrgeometers NIGHT andDAY NIGHT

  12. Unshaded pyrgeometers 1 Dome YSI Proxy: direct solar irradiance

  13. Unshaded pyrgeometers 1 Dome YSI Proxy: direct solar irradiance Proxy: Dome-body temperature

  14. Unshaded pyrgeometers PIR Dome proxy Direct irr proxy

  15. Unshaded pyrgeometers PIR 3 Th. Dome proxy Direct irr proxy R=0.81 Effect is 6 W/m2 per 1kW for this particular pyrgeometer R=0.91 26955 3 dome

  16. Unshaded pyrgeometers CG4 Effect is 5.5 W/m2 per 1kW for this particular pyrgeometer cg4

  17. Summary unshaded pyrgeometers

  18. IPC-XI Pyrgeometer intercomparison PIR & CG4 Difference to WISG / Wm-2 unshaded shaded

  19. IPC-XI Pyrgeometer intercomparison Only CG4 Difference to WISG / Wm-2

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