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The University of OregonSolar Radiation Monitoring Lab
Where We’ve Been and Where We’re Going
BSRN WorkshopJuly 16-20, 2018Boulder, Colorado
Josh Peterson Frank VignolaRich Kessler
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Outline of talk
• Overview of the SRML
• Description of the Eugene monitoring station
• Available data
• A few studies over the past 40 years
• Current activities and future plans
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Overview of the SRMLThe SMRL is the Pacific Northwest’s regional
solar radiation data center
Support for the lab comes from regional utilities with assistance from NREL and other entities.
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• Data collection started at the University of Oregon in Eugene with global horizontal irradiance measurements in 1975. Direct normal irradiance measurements were added in 1977.
• The Eugene station is also our primary research facility used to characterize and evaluate solar monitoring equipment and to calibrate our instruments.
The Eugene Monitoring Station
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1980s
Eugene monitoring station,then and now
2018
Tilted, auxiliary, and spectral sensors
The GHI, DNI, DHI sensors, and pyrgeometer are on the automatic tracker
Roughly 10 years after inception
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Key features of the SRML website
• Stations in the network
• Publications
• Sponsors
• Educational Information
• Data - Irradiance and Metrological• All data is publicly available• http://solardata.uoregon.edu
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Available data files
• Station data files• One-minute to hourly interval data from stations in
monthly blocks.
• Spectral data files: Yankee MFRSR and EKO Spectroradiometer files• EKO spectral data comes with corresponding
broadband and other metrological information
http://solardata.uoregon.edu/SelectArchival.html
http://solardat.uoregon.edu/SelectMFR.html
http://solardat.uoregon.edu/SelectEKO.html
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38 plus years of DNI data
1982 Eruption of El Chichòn (Mexico)
1991 Eruption of Mt. Pinatubo (Philippines)
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A few of the SRML studies
1. Spectral biases of a photodiode pyranometers
2. Deviation for lambert cosine response
3. Thermal offset effects
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• The LI-200SA responsivity depends on the spectral composition of incident radiation that changes over the day. The DHI dependence is significant for the LI-200SA ~30%.
• The Schenk does not have a spectral dependence
Spectral biases of a LI-200SA Pyranometer
• Comparison of two DHI sensors
• Photodiode: A LI200SA with a rotating shadowband
• Thermopile: A Schenk Star pyranometer with a shadeball
Vignola, Michalsky, Stoffel: 2012
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GHI Ref = DNI * Cos(SZA) + DHIDNI = CHP1DHI = Schenk with shadeball
■PSP
GHI Ref●CMP22
GHI Ref
Cosine response of a first class and secondary standard pyranometer
The responsivity of the PSP has a large cosine response. What is its uncertainty?
Eugene, OR 2017-12 -06
Eugene, OR 2017-06 -23
Note the SZA scale of the winter plot
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Younkin and Long: 2003Vignola, Michalsky, Stoffel: 2012, Figure 5.6
Thermal Offset of an Eppley PSP
Overcast skies
Clear nighttime skies
Clear daytime skies
• Pyrgeometer data was used to calculate the thermal offset.
• The most negative values are obtained during clear sky periods.
• Larger offsets in the afternoon than in the morning.
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Current Activities
1. Provide calibration information for each instrument on the website
2. Reformat the data files with enhanced information
3. Investigate the effects of spectral data on various systems
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Current Activities - Calibrations
• The calibration process has been streamlined and formalized with new software
• Absolute Cavity Radiometer obtained in 2010
• The SRML performs yearly calibrations of instruments
• Plans are to provide detailed calibration information for each instrument on the website
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Sample of Column Information
Row Labels Instrument 1
Type of Measurement: GHI
Element: 1000
Instrument Serial Number:PSP
(23973F3)
Instrument Shorthand Name: P23
Responsivity:8.6844
µV/W/m2
Estimated Uncertainty (U95%): 3.587
Sample Method: Avg
Units: W/m2
Column Notes: Processed
Current Activities - Comprehensive Data Format
The new format offers significantly more information about the data contained within each file.
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Current Activities - Spectral Measurements
Clear sky spectral data from a Multi-Filter Rotating Shadowband Radiometer
Predominate DNI colors are 501 – 674 nm. The Sun is “white”.
Predominate DHI colors are 414 – 501 nm. The sky is “blue”.
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Contact Information:
Josh Peterson: [email protected]
Frank Vignola: [email protected]
Web: http://solardata.uoregon.edu
Conclusions
The Solar Radiation Monitoring Lab at the University of Oregon has been making high quality GHI and DNI measurements since the late 1970’s.
Characterizing the bias and uncertainties in irradiance measurement is essential. Spectral measurements are becoming increasingly important.
Thank you for your attention!
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Solar Radiation Monitoring Lab
Materials Science InstituteUniversity of Oregon
Measuring the sun every day it rises.
Contact Information:
Josh Peterson: [email protected]
Frank Vignola: [email protected]
Web: http://solardata.uoregon.edu