USDA Forest Service
 

Pacific Southwest Research Station

 

Pacific Southwest Research Station
800 Buchanan Street
Albany, CA 94710-0011

(510) 559-6300

United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.

Distribution of ozone, ozone precursors and gaseous components of atmospheric nitrogen deposition in the Lake Tahoe Basin

Principal Investigators:
Andrzej Bytnerowicz, USDA Forest Service-Pacific Southwest Research Station
Mark Fenn, USDA Forest Service-Pacific Southwest Research Station
Alan Gertler, Desert Research Institute
Haiganoush Preisler, USDA Forest Service-Pacific Southwest Research Station
Barbara Zielinska, Desert Research Institute

Proposal [pdf]

Final Report [pdf]
Appendix A [pdf]
Appendix B [pdf]
Geostatistical Maps [pdf]

Please contact Dr. Andrzej Bytnerowicz with questions regarding the final report.

Project Summary

This study characterized spatial and temporal distribution of ozone (O3), O3 precursors, O3 formation, and gaseous pollutants that are important contributors to atmospheric nitrogen (N) deposition in the Lake Tahoe Basin. Passive samplers were used to monitor O3, nitric oxide (NO), nitrogen dioxide (NO2), ammonia (NH3), nitric acid (HNO3) and volatile organic compounds (VOCs) on a network of 34 sites inside and outside of the basin. Using statistical and geostatistical models, distribution maps of the measured compounds were created for the entire basin.

On a subset of 10 monitoring sites, real-time O3 concentrations were measured with ultraviolet absorption monitors. At these sites, N deposition was measured with ion exchange resin (IER) collectors placed in forest clearings (bulk precipitation) and under tree canopies (throughfall). In the bulk and throughfall samples from the IER collectors, we measured the stable isotope composition (δ15N and δ18O) of NO3 to evaluate the origin of N deposition in the basin.

Last Modified: Nov 24, 2014 04:35:57 PM