Project at a Glance

Title: Sierra cooperative ozone impact assessment study: Year 4. Volume 1, Volume 2, Part A: 1993 hourly tabulations, Volume 2, Part B: 1994 hourly tabulations

Principal Investigator / Author(s): Carroll, John J

Contractor: UC Davis

Contract Number: 92-346

Research Program Area: Ecosystem & Multimedia Effects

Topic Areas: Ecosystem Impacts, Impacts


The purpose of the Sierra Cooperative Ozone Impact Assessment Study (SCOIAS) is to document the degree to which sensitive pine species in Sierran forests are exposed to ozone and the amount of injury the exposed trees exhibit. In 1990, monitoring sites began to be installed in the Sierra Nevada mountains in order to quantify the amount of ozone present among the forests. Volume 1 of this report documents the activities completed during the third and fourth years of this project (July 27, 1993 to May 18, 1995). Included in Volume 1 are instrument performance, monitoring results, comparisons with other data and time plots of the hourly averaged data for May through October at all six sites (Mountain Home, Shaver Lake, Jerseydale, Five Mile, Sly Park and White Cloud) involved in the study. Previous years' information is contained in reports for Year 1 (April 16, 1990 to April 15, 1991), Year 2 (June 7, 1991 to June 6, 1992) and Year 3 (June 7, 1992 to October 30, 1993).

Volume 2 of this report contains the hourly averaged data tabulations for the 1993 and 1994 data. This part of Volume 2, Part A, reports the 1993 data for the six sites beginning with the Mountain Home site and concluding with White Cloud. Each site contains data grouped chronologically by month with nine different meteorological variables for each month. The variables are as follows: wind direction calculated from U and V wind components (in degrees), average wind direction (in degrees), wind speed (in meters per second), west to east (U) wind component (in meters per second), south to north wind component (in meters per second), temperature (in degrees Celsius), relative humidity (in percent), ozone concentration (in parts per billion by volume) and solar radiation (in Watts per meter squared). Part B reports the 1994 data. Hourly data for the first three years of this study (1990-1992) are recorded in Volume 2 of the report titled "Sierra Cooperative Ozone Impact Assessment Study: Year 3."

The hourly data are computed from five-minute averages and labeled as the time ending the hour. For missing or invalid data the value "-99" is recorded. Data are considered invalid or missing if less than 75 percent of the data for an hour are valid. Missing data are due to power outages and computer malfunctions while invalid data are the result of instrument malfunction, removal or calibration. The layout of each data form is described in the introductory note below.

For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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