IPC-XI Tutorial Pyrgeometer. Contents Pyrgeometer energy balance Equations for retrieving longwave irradiance Shaded versus unshaded pyrgeometers.

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Presentation transcript:

IPC-XI Tutorial Pyrgeometer

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

Pyrgeometer setup

Pyrgeometer energy balance Eppley PIR Kipp&Zonen CG4 5µm40µm20µm

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

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

Calibration residuals versus WISG

Calibration residuals versus WISG results from 50 Instruments

Shaded versus unshaded Pyrgeometers

Shaded pyrgeometers

Unshaded pyrgeometers NIGHT 1 Dome YSI

Unshaded pyrgeometers NIGHT NIGHT and DAY

Unshaded pyrgeometers Proxy: direct solar irradiance 1 Dome YSI

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

Unshaded pyrgeometers PIR Dome proxy Direct irr proxy

Unshaded pyrgeometers PIR 3 Th. Dome proxy Direct irr proxy R=0.81 R=0.91 Effect is 6 W/m 2 per 1kW for this particular pyrgeometer dome

Unshaded pyrgeometers CG4 Effect is 5.5 W/m 2 per 1kW for this particular pyrgeometer cg4

Summary unshaded pyrgeometers InstrumentOffset per 1000 Wm -2 Direct irradiance PIR 3 Dome Thermistor7.0 PIR 3 Dome Th.6.2 PIR 3 Dome Th.6.8 PIR 3 Dome Th.7.4 PIR 1 Dome Th.11.2 PIR 1 Dome Th.15.3 PIR 1 Dome Th.11.5 PIR 1 Dome Th.4.0 PIR 1 Dome Th.8.5 PIR 1 Dome Th.11.4 PIR 1 Dome Th.4.6 InstrumentOffset per 1000 Wm -2 Direct irradiance CG42.6 CG45.4 CG43.1 CG4 CG45.3 CG45.5 CG113.4

Summary unshaded pyrgeometers InstrumentOffset per 1000 Wm -2 Direct irradiance PIR 3 Dome Thermistor7.0 PIR 3 Dome Th.6.2 PIR 3 Dome Th.6.8 PIR 3 Dome Th.7.4 PIR 1 Dome Th.11.2 PIR 1 Dome Th.15.3 PIR 1 Dome Th.11.5 PIR 1 Dome Th.4.0 PIR 1 Dome Th.8.5 PIR 1 Dome Th.11.4 PIR 1 Dome Th.4.6 InstrumentOffset per 1000 Wm -2 Direct irradiance CG42.6 CG45.4 CG43.1 CG4 CG45.3 CG45.5 CG113.4 Is there shortwave leakage in the solar blind filters?

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

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