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IPC-XI Tutorial Pyrgeometer - PowerPoint PPT Presentation

IPC-XI Tutorial Pyrgeometer. Contents. Pyrgeometer energy balance Equations for retrieving longwave irradiance Shaded versus unshaded pyrgeometers. Pyrgeometer setup. Pyrgeometer energy balance. Kipp&Zonen CG4. Eppley PIR. 5µm. 20µm. 40µm. Pyrgeometer energy balance. Kipp&Zonen CG4.

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IPC-XITutorial Pyrgeometer

• Pyrgeometer energy balance

• Equations for retrieving longwave irradiance

Kipp&Zonen CG4

Eppley PIR

5µm

20µm

40µm

Kipp&Zonen CG4

Typical values:

Net outgoing radiation ~ 100 Wm-2

PIR Dome (∆T=1K) ~18 Wm-2

Eppley PIR

• Several choices for the radiometric model of a pyrgeometer:

Simple Albrecht formula

Extended Albrecht (PMOD)

NREL formula

Fit parameters

Calibration residuals versus WISGresults from 50 Instruments

1 Dome YSI

NIGHT

NIGHT andDAY

NIGHT

1 Dome YSI

1 Dome YSI

Proxy: Dome-body temperature

Dome proxy

Direct irr proxy

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

Effect is 5.5 W/m2 per 1kW

for this particular pyrgeometer

cg4

Is there shortwave leakage in the solar blind filters?

PIR & CG4

Difference to WISG / Wm-2