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SRRL BMS Recommended Measurements



Measurement
Primary
Alternative
Direct Normal Direct CHP1-1
Direct CHP1-2
Direct sNIP
Diffuse Horizontal Diffuse CM22-2 (vent)
Diffuse CM22-1 (vent)
Diffuse SR25
The SR25 is not ventilated.
Global Horizontal Calculated from Direct and Diffuse above Global CMP22 (vent)
Calculated global will be the most accurate, however a measured alternative is provided.
Global Horizontal Total UV Global CUV4 Global TUVR
Global Horizontal UVA Global UVA 501A Global UVA UV-S-A-T
Global Horizontal UVB Global UVB 501A Global UVB UV-S-B-T
Global Horizontal UV-Erythema Global UVE 501A
Global Horizontal Quantum (PAR) Global Quantum PQS-1
Global Horizontal Photometric Global Photometric LI-210
Global 40-South/1-Axis/Normal Global 40-South/1-Axis/Normal CMP22
Global 90-North/East/South/West Global 90-North/East/South/West PSP
Direct Total/UVA/UVB/Quantum Only one choice for each
Downwelling Infrared Downwelling IR PIR Downwelling IR CG4
Upwelling Infrared Upwelling IR PIR Upwelling IR CG3
Upwelling Shortwave Upwelling Shortwave CMP11
Dry Bulb Temperature Dry Bulb Temp (Tower) Dry Bulb Temp (Deck)
The tower sensor is measured at the standard 2 meter height above ground. The deck sensor is collocated with radiometers and is 19 feet above ground.
Relative Humidity Relative Humidity (Tower) Relative Humidity (Deck)
The tower sensor is measured at the standard 2 meter height above ground. The deck sensor is collocated with radiometers and is 19 feet above ground.
Wind Speed & Direction Wind Speed & Direction (33') Wind Speed & Direction (19')
Wind at 33 feet is the standard 10 meter height above ground. Wind at 19 feet is collocated with radiometers on deck.
Pressure/Electric Field/Precipitation/Snow Only one choice for each
Aerosol Optical Depth (at specific wavelengths) AOD ESR Level 1.1
AOD ESR Level 0
SolarSIM-D2+ AOD
ESR Level 1.1 is the highest quality but is only updated monthly. ESR Level 0 is not as high quality as 1.1 but it is available daily. Both ESR data sets are processed by an external agency and may not be available without notice, therefor SolarSIM is provided as an alternate which is in-house.
Broadband Turbidity Broadband Turbidity
Precipitable Water Vapor (PWV) GPS-Based PWV SolarSIM-D2+ PWV
GPS-Based PWV data set is processed by an external agency and may not be available without notice, therefor SolarSIM is provided as an alternate which is in-house.
Albedo Albedo (CMP11)
Global Horizontal Spectral Irradiance SRRL WISER Global
Direct Normal Spectral Irradiance SRRL PGS-100 Direct Normal SRRL SolarSIM-D2+ Direct Normal
The PGS-100 is a limited range spectral instrument but irradiance is measured at each wavelength. The SolarSIM is very wide range spectral instrument, but irradiance is only measured at 6 wavelengths and the full spectrum is computed using a model.
Global Horizontal Spectral Irradiance at 1-Axis/2-Axis/40-South SRRL WISER 1-Axis/2-Axis/40-South
The WISER has been used in various orientations, if the model is not shown, be sure to click the blue link to view the meta data to check the model.
Sky Imagery SRRL ASI-16 SRRL TSI-880
The ASI-16 is much higher quality and resolution, however the TSI-880 image and data processing feed is much more reliable. The ASI-16 is available at 2 exposure levels and the sensor can handle the high intensity of the sun. The TSI-880 requires a shadow band to block the sun and the shadow band has failed.

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