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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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Presentation Transcript
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

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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