Jun Zheng
| Title | Research Associate |
| Research Interests | Air quality study in the troposphere through field measurements of VOCs and nitrogen species (HNO3, N2O5, NO3 and NH3) using PTR-MS and ID-CIMS; Development of instrument for aerosol precursors (H2SO4 and Organic acids) detection in the atmosphere. |
| Education | Ph.D., Atmospheric Chemistry, Stony Brook Universityy, 2005 |
| Office Location | Room 1115, O&M Bldg |
| Office Phone | 979-458-0555 |
| Fax | 979-862-4466 |
| junzheng@ariel.met.tamu.edu | |
| Mailing Address |
Department of Atmospheric Sciences Texas A&M University 3150 TAMU College Station, TX 77843-3150 |
Research Interests
Real-time field measurements of trace chemical components in the atmosphere can give atmospheric chemists the opportunity to directly observe the chemical processes evolving in the atmosphere and provide valuable input data for atmospheric models to predict the formation of harmful air pollution plumes and their transport in the atmosphere. During March 2006, we deployed a PTR-MS and an ID-CIMS in Mexico City to measure VOCs and HNO3, N2O5, and NO3 radical. The goal of this research is to characterize the VOCs sources and the chemical processes responsible for severe air pollution events, which is usually represented by hazardous level of O3 and aerosol. Aerosols have caused a big concern due to their health effects and uncertain roles in the climate change. Although aerosol mass loading and size distribution are routinely monitored in field experiments, new aerosol formation mechanism is still not well understood. The process that initiates new aerosol formation usually involves gas-phase H2SO4. Laboratory studies show that when organic acids are also present, the aerosol formation rate will be accelerated. We are developing an ID-CIMS technique to do in-situ measurements of those aerosol precursors including H2SO4, organic acids, NH3, and HNO3. These measurements will help us to evaluate and improve proposed aerosol formation mechanisms.
Selected Publications
Zheng, J., Springston, S. R., and Weinstein-Lloyd, J. Quantitative analysis of hydroperoxyl radical using flow injection analysis with chemiluminescence detection. Anal. Chem. 75, 4696-4700, doi:10.1021/ac034429v (2003).
Daum, P. H., Kleinman, L. I., Springston, S. R., Nunnermacker, L. J., Lee, Y.-N., Weinstein-Lloyd, J., Zheng, J., and Berkowitz, C. A comparative study of O3 formation in the Houston urban and industrial plumes during the TEXAQS 2000 Study. J. Geophys. Res. 108, 4715, 10.1029/2003JD003552 (2003).
Daum, P. H., Kleinman, L. I., Springston, S. R., Nunnermacker, L. J., Lee, Y.-N., Weinstein-Lloyd, J., Zheng, J., and Berkowitz, C. M. Origin and properties of plumes of high ozone observed during the TexAQS 2000 study. J. Geophys. Res. 109, D17306, doi:10.1029/2003JD004311 (2004).
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