Ipc xi tutorial pyrgeometer
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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 xi tutorial pyrgeometer

IPC-XITutorial Pyrgeometer


Contents
Contents

  • Pyrgeometer energy balance

  • Equations for retrieving longwave irradiance

  • Shaded versus unshaded pyrgeometers



Pyrgeometer energy balance
Pyrgeometer energy balance

Kipp&Zonen CG4

Eppley PIR

5µm

20µm

40µm


Pyrgeometer energy balance1
Pyrgeometer energy balance

Kipp&Zonen CG4

Typical values:

Net outgoing radiation ~ 100 Wm-2

PIR Dome (∆T=1K) ~18 Wm-2

Eppley PIR


Pyrgeometer equations
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 results from 50 instruments
Calibration residuals versus WISGresults from 50 Instruments




Unshaded pyrgeometers
Unshaded pyrgeometers

1 Dome YSI

NIGHT


Unshaded pyrgeometers1
Unshaded pyrgeometers

NIGHT andDAY

NIGHT


Unshaded pyrgeometers2
Unshaded pyrgeometers

1 Dome YSI

Proxy: direct solar irradiance


Unshaded pyrgeometers3
Unshaded pyrgeometers

1 Dome YSI

Proxy: direct solar irradiance

Proxy: Dome-body temperature


Unshaded pyrgeometers pir
Unshaded pyrgeometers PIR

Dome proxy

Direct irr proxy


Unshaded pyrgeometers pir 3 th
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


Unshaded pyrgeometers cg4
Unshaded pyrgeometers CG4

Effect is 5.5 W/m2 per 1kW

for this particular pyrgeometer

cg4



Summary unshaded pyrgeometers1
Summary unshaded pyrgeometers

Is there shortwave leakage in the solar blind filters?


Ipc xi pyrgeometer intercomparison
IPC-XI Pyrgeometer intercomparison

PIR & CG4

Difference to WISG / Wm-2

unshaded

shaded


Ipc xi pyrgeometer intercomparison1
IPC-XI Pyrgeometer intercomparison

Only CG4

Difference to WISG / Wm-2


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