ARB Research Seminar

This page updated July 26, 2013

Lessons Learned from SCOS97 - NARSTO Upper Air Meteorology Measurement Program - Applications to Current and Future Programs

Clinton P. MacDonald, Sonoma Technology, Inc.; and Robert A. Baxter, Technical & Business Systems, Inc.

January 09, 2003
Cal EPA Headquarters, 1001 "I" Street, Sacramento, CA

Research Project: 1. 2.


The 1997 Southern California Ozone Study (SCOS97-NARSTO) upper air meteorological monitoring network consisted of 26 radar wind profiler/RASS, 6 sodars, and rawinsonde instruments operated by the National Weather Service, California Air Resources Board, and the military at various installations located within the study area. The purpose of the measurement program was to characterize flow patterns and provide data for future modeling in the region. Integral to the measurement program was a quality assurance effort to independently review site operations and verify the quality of data collected. As a result of those assessments and a review of the preliminary database that was generated, an effort was undertaken to reprocess the data and improve the quality of the final database. Through the course of the reprocessing effort, which included extensive evaluation and comparison of profiler and rawinsonde data, a variety of post-processing methods were tested for their ability to handle bird interference and other artifacts that affected the data quality.

In this presentation we will discuss lessons learned during the course of both the quality assurance program and the subsequent data reprocessing effort and quality control. We will also discuss how these lessons learned in the SCOS97-NARSTO project were applied to subsequent monitoring efforts in the Central California Ozone Study and California Regional PM10/PM2.5 Air Quality Study, as well as some issues relating to operations, quality control, and data reporting that were not applied. Finally, we will present recommendations to incorporate what we have learned into future programs that use this remote sensing technology.

Speaker Biography

Clinton MacDonald is Manager of Meteorological and Air Quality Analysis Services and leads a variety of data analysis programs that involve the quality control and use of radar profiler and RASS data. Much of the analysis focuses on air quality issues including an understanding of the meteorological and chemical processes that influence ozone, particulate matter, and their precursors. He holds an M.S. in Atmospheric Science from University of California, Davis. He co-authored the 1998 United States Environmental Protection Agency (EPA) document "Guidelines for Developing an Ozone Forecasting Program," recently co-taught an EPA-sponsored course on air quality forecasting, is a participating instructor on radar profiler and RASS data at the upcoming 2003 AMS meeting, and taught a course at the ARB on the use of radar profiler and RASS data to understand the meteorological processes that influence air quality in California.

Robert Baxter is a Program Manager with Technical & Business Systems, Inc. and leads the development and implementation of measurement and quality assurance programs for both air quality and meteorological measurement projects. Active in committees for ASTM, AMS and the A&WMA, he participated in the preparation of EPA guidance for meteorological measurements and is active in the teaching of workshops and short courses for the measurement of air quality and meteorological variables. He holds a B.S. degree in Meteorology from San Jose State University and is a Certified Consulting Meteorologist.

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