recent updates about the absolute cavity pyrgeometer (acp ... · 0.10 0.31 -1.17 -1.58 -1.77. stdev...
TRANSCRIPT
Recent Updates about the Absolute Cavity Pyrgeometer (ACP), InfraRed Integrating Sphere (IRIS), and Atmospheric Emitted Radiance Interferometer (AERI) Comparisons
Ibrahim Reda, Julian Gröbner, and Dave TurnerBSRN 2018 WorkshopJuly 19, 2018
NREL | 2
Overview
• Results of five comparisons between ACPs and IRISs.• Difference between the longwave irradiance
measured by the ACPs and IRISs versus the irradiance measured by the WISG.
• The longwave irradiance measured by the ACPs, IRISs, and AERI versus the irradiance measured by the WISG.
NATIONAL RENEWABLE ENERGY LABORATORY 3
Results of First Comparison between ACPs and IRISs-Davos
211212213214215216217218219220221222223224225226227228
0:00:00 0:28:48 0:57:36 1:26:24 1:55:12 2:24:00 2:52:48 3:21:36 3:50:24
Irrad
ianc
e (W
/m2 )
Time
Average Irradiance of Two IRISs&ACP95F3 or 96F3 versus the WISG Average Irradiance at night on Feb. 5, 2013
(~8 mm H2O vapor column)
Av IRISs&ACP95F3 Av IRISs&ACP96F3 WISG
NATIONAL RENEWABLE ENERGY LABORATORY 4
Results of Second Comparison between ACPs and IRISs-Davos
257
259
261
263
265
267
269
271
273
275
277
279
0:00:15 0:25:15 1:14:08 19:00:24 20:22:26 20:47:26 21:27:29 21:52:29 22:46:19 23:11:19 23:51:15
Irrad
ianc
e (W
/m2 )
Time
Average Irradiance of Two IRISs&ACP96F3 versus the WISG Average Irradiance on Oct. 2&3, 2013(~15 mm H2O vapor column)
Av IRISs&ACP96F3 WISG
NATIONAL RENEWABLE ENERGY LABORATORY 5
Results of Third Comparison between ACPs and IRISs-Davos
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
18:41:31 20:47:31 22:07:31 22:57:31 23:47:31 0:37:31 1:27:31 2:17:31 3:07:31 19:13:31 21:32:31 22:22:31 23:12:31
Irrad
ianc
e (W
/m2 )
Time
Average Irradiance of Four IRISs&ACP95F3 or ACP96F3 versus the WISG Average From September 28 to October 16, 2015
(~10 mm H2O vapor column)
AV IRISs&ACP96F3 AV IRISs&ACP95F3 WISG
NATIONAL RENEWABLE ENERGY LABORATORY 6
Results of Fourth Comparison between ACPs and IRISs-SGP-Phase 1
274
278
282
286
290
294
298
302
306
310
314
20:51:42 23:21:32 2:19:53 22:13:49 0:50:32 3:28:56 18:38:31 23:11:46 1:50:41 4:26:47
Irrad
ianc
e (W
/m2 )
CST
Average of Three IRISs & Two ACPs Versus PIR-31197F3 with traceability to WISG on October 16, 17, 18, 24, 25, 26, 2017
AV IRISs&ACPs WISG
NATIONAL RENEWABLE ENERGY LABORATORY 7
Results of Fifth Comparison between ACPs and IRISs-SGP-Phase 2
300
302
304
306
308
310
312
314
316
318
320
322
324
0:00:24 0:29:24 0:54:54 1:20:54 2:13:17 2:49:17 3:52:03 4:30:03 5:16:03 6:05:28
Irrad
ianc
e (W
/m2 )
CST
Average of Three IRISs and Two ACPs Versus PIR-30475F3 with traceability to WISG on November 28, 2017
Average ACPs&IRISs WISG
NATIONAL RENEWABLE ENERGY LABORATORY 8
Summary of the Five comparisons
W/m2 First Second Third Fourth Fifth
Average difference between ACPs&IRISs 0.10 0.31 -1.17 -1.58 -1.77
StDev of Difference 0.08 0.65 0.70 1.15 0.88
Difference within 95% 0.19 1.34 1.82 2.79 2.50
Average of ACPs&IRISs - WISG 3.93 6.14 3.82 3.50 6.50
StDev of Difference 0.97 0.76 0.67 0.81 0.66
Difference within 95% 4.38 6.33 4.05 3.86 6.63
NATIONAL RENEWABLE ENERGY LABORATORY 9
Results of Comparison between ACPs, IRISs, and AERI at SGP
NATIONAL RENEWABLE ENERGY LABORATORY 10
Results of Comparison between ACPs, IRISs, and AERI at SGP
NATIONAL RENEWABLE ENERGY LABORATORY 11
Results of Comparison between ACPs, IRISs, and AERI at SGP
NATIONAL RENEWABLE ENERGY LABORATORY 12
Results of Comparison between ACPs, IRISs, and AERI at SGP
NATIONAL RENEWABLE ENERGY LABORATORY 13
Results of Comparison between ACPs, IRISs, and AERI at SGP
NATIONAL RENEWABLE ENERGY LABORATORY 14
Results of Comparison between ACPs, IRISs, and AERI at SGP
NATIONAL RENEWABLE ENERGY LABORATORY 15
Water Vapor effect on Irradiance difference (WISG minus IRIS) at PMOD
Results
Average Offset (IWV>10) -4.1 ± 1.5 Wm-2
Gradient (IWV<10) -0.45 ± 0.1 Wm-2mm-1IWV
WISG 1 WISG 2 WISG 3
WISG 4
Night averages
IRIS u95
From J. Gröbner et al., JGR, 2014
NATIONAL RENEWABLE ENERGY LABORATORY 16
• The difference between the irradiance measuredby the ACPs, IRISs, and AERI varied from 0.2W/m2 to 2.5 W/m2 based on the atmosphericconditions, which is within the stateduncertainties of ±3 W/m2.
• The irradiance measured by the WISG is lowerthan the average irradiance measured by ACPsand IRISs, magnitude of the difference variedfrom 4.4 W/m2 to 6.6 W/m2 depending on theintegrated water vapor.
Conclusion
NATIONAL RENEWABLE ENERGY LABORATORY 17
WMO CIMO Task Team on Radiation References
• The first session of the World Meteorological Organization (WMO) Commission for Instruments and Methods of Observation Commission (CIMO) Task Team on Radiation References (TT) was held in the National Physical Laboratory (NPL) from November 15 to 17, 2017 in Teddington, United Kingdom.• The meeting focused on the traceability of terrestrial radiation measurements. It reviewed and evaluated recent developments of reference instruments for terrestrial radiation, and developed recommendations to the attention of CIMO on the appropriateness, requirements and timeliness for a possible future modification of the current reference.• Relevant recommendations from the TT will be submitted to the CIMO MG (26-29 March 2018), and most likely to CIMO-17 session (12-16 October 2018, Amsterdam) for endorsement. The report of the TT meeting will encompass all the recommendations.
NATIONAL RENEWABLE ENERGY LABORATORY 18
Newton’s Apple Tree in National Physical Laboratory, UK, London-November 2017
Nigel, Reda, Isabelle, Bruce, Julian, Peter, Alison, Nozumo
NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
www.nrel.gov
NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiencyand Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
Thank YouContact :Ibrahim Reda [email protected]
This work was authored by the National Renewable Energy Laboratory, operated by Alliance for Sustainable Energy, LLC, for the U.S. Department of Energy (DOE) under Contract No. DE-AC36-08GO28308. Funding provided by U.S. Department of Energy Office of Energy Efficiency and Renewable Energy. The views expressed in the article do not necessarily represent the views of the DOE or the U.S. Government. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for U.S. Government purposes.
NREL/PR-1900-71819