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Comprehensive Guide to Pyrgeometer Energy Balance and Longwave Irradiance Retrieval

DESCRIPTION

This tutorial covers the principles of pyrgeometer energy balance, exploring methods for retrieving longwave irradiance. It discusses the differences between shaded and unshaded pyrgeometers, providing insights into calibration techniques and radiometric models such as the Albrecht formula and NREL formula. Typical values for net outgoing radiation, along with various calibration results, are highlighted. Additionally, the impact of dome filters on measurements is addressed, ensuring a thorough understanding of pyrgeometer operation and intercomparison results for effective solar irradiance assessments.

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Comprehensive Guide to Pyrgeometer Energy Balance and Longwave Irradiance Retrieval

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Presentation Transcript

  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 5µm 20µm 40µm

  5. Pyrgeometer energy balance Kipp&Zonen CG4 Typical values: Net outgoing radiation ~ 100 Wm-2 PIR Dome (∆T=1K) ~18 Wm-2 Eppley PIR

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

  7. Calibration residuals versus WISG

  8. Calibration residuals versus WISGresults from 50 Instruments

  9. Shaded versus unshaded Pyrgeometers

  10. Shaded pyrgeometers

  11. Unshaded pyrgeometers 1 Dome YSI NIGHT

  12. Unshaded pyrgeometers NIGHT andDAY NIGHT

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

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

  15. Unshaded pyrgeometers PIR Dome proxy Direct irr proxy

  16. 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

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

  18. Summary unshaded pyrgeometers

  19. Summary unshaded pyrgeometers Is there shortwave leakage in the solar blind filters?

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

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

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