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PROGRESS ON AN UPDATED NATIONAL SOLAR RADIATION DATA BASE FOR THE UNITED STATES Stephen Wilcox Mary Anderberg, Ray George William Marion, Daryl Myers David Renné National Renewable Energy Laboratory 1617 Cole Boulevard Golden, CO 80402 Email: Stephen_wilcox@nrel.gov William Beckman University of Wisconsin Arthur DeGaetano Northeast Regional Climate Center ABSTRACT In 1992, The National Renewable Energy Laboratory (NREL) released the 1961-1990 National Solar Radiation Data Base (NSRDB), a 30-year set of hourly solar radiation data. In 2003, NREL undertook an NSRDB update project for the decade of 1991-2000. Recent work on the project includes the production of a two-year test data set, which allowed us to evaluate models, investigate the availability and suitability of model input data, survey the availability of surface meteorological data, expand the scope of a new satellite-based solar radiation model, and propose a plan for a 1991-2000 NSRDB update. This paper describes recent work and evaluation of the test data set. Preliminary recommendations will be reviewed by an expert committee involved since the inception of the update project, and from that review we will develop a full data base update plan. 1. INTRODUCTION In 1992, the National Renewable Energy Laboratory (NREL) released the 1961-1990 National Solar Radiation Data Base (NSRDB), a 30-year, 239-station data set of measured and modeled solar radiation and accompanying meteorological data (1). In 2003, NREL investigated the feasibility of producing a 1991-2000 update of the NSRDB (2) and devised a proof-of-concept project to investigate solutions to several obstacles, including the switchover by Christian Gueymard Solar Consulting Services Richard Perez State University of New York at Albany Marc Plantico National Climatic Data Center Paul Stackhouse National Aeronautics and Space Administration Frank Vignola University of Oregon the National Weather Service (NWS) to the Automated Surface Observing System (ASOS) for routine meteorological observations. For this proof-of-concept, we produced a two-year test data set for 33 stations as part of a model evaluation process. During this work, we: • Acquired solar irradiance data for validation • Modified the METSTAT solar model inputs for ASOS and satellite cloud product • Evaluated a new model from the Northeast Regional Climate Center (NRCC) that uses ASOS and satellite cloud inputs • Produced a gridded solar product using the State University of New York at Albany (SUNYA) satellite model • Investigated the feasibility of new clear sky algorithms for solar models • Developed improved atmospheric aerosol and water vapor estimates • Evaluated differences among the candidate models • Made preliminary recommendations for how to proceed with a 1991-2000 NSRDB update. 2. PROJECT STATUS This section describes significant activities on the proof-of- concept project to investigate the feasibility of producing an updated NSRDB. 1PDF Image | Progress on an Updated National Solar Radiation Data Base for the United States
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