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NREL Pyrheliometer Comparisons - 2002

Reda, I. and Stoffel, T.L., National Renewable Energy Laboratory
Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting

All broadband shortwave radiometers used by the ARM Program are calibrated with absolute cavity radiometers traceable to the World Radiometric Reference (WRR). The WRR was developed and is maintained by the World Radiation Center under the auspices of the World Meteorological Organization. Each fall, the National Renewable Energy Laboratory (NREL) hosts annual comparisons of absolute cavity radiometers at the Solar Radiation Research Laboratory in Golden, Colorado. Since 1995, NREL has maintained the Transfer Standard Group (TSG) consisting of five radiometers belonging to NREL and the ARM Program. Our poster summarizes the results of the latest NREL Pyrheliometer Comparisons for 2002 (NPC-2002). The WRR Reduction Factor was successfully determined at the event for 23 pyrheliometers operated by the 16 participants representing the ARM Program, Atlas Weathering Services-DSET Labs, European Solar Test Installation, Lockheed-Martin, NASA, NOAA, State University of New York, and DOE/NREL renewable energy technology programs. The final measurement uncertainties estimated for the ARM Program reference absolute cavity radiometers remains unchanged from previous NPCs on the order of +/- 0.5%.

Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).