Upper Green Winter Ozone StudyLong-line Tower and Balloon-borne Ozone and Ozone Precursor Vertical Profile Sampling for Upper Green Winter Ozone Study 2011
David Bush
Overview
Background
UGWOS
Upper Green Winter Ozone Study (UGWOS)
Upper Green River Wintertime Ozone Study – UGWOS 2007
Lack of snow and no elevated ozone episodes
Learned enough for planning future years
UGWOS 2008
UGWOS 2009, 2010
2011 National Air Quality Conferences
UGWOS – Ozone, Met Profiles
Several examples of existing UGWOS data. “Snapshot” vertical soundings of temperature and ozone using ozonesondes.
2011 National Air Quality Conferences
UGWOS – Spatial Monitoring
UGWOS – Spatial Monitoring
2011 National Air Quality Conferences
WY DEQ Ozone Forum
2009, 2010 Ozone Forum
Discuss additional monitoring
What is the diurnal vertical structure of the ozone concentrations?
2011 National Air Quality Conferences
What is the diurnal vertical structure of ozone precursors?
2011 National Air Quality Conferences
What is the vertical diurnal structure of ozone precursors?
2011 National Air Quality Conferences
UGWOS 2011
Tethered Balloon
Tall Tower
2011 National Air Quality Conferences
Long-line Measurements
Methodology based on our experience with long-line measurements at the Walnut Grove tower since 1991
2011 National Air Quality Conferences
Long-line Measurement Equipment
Baseline-Mocon Series 9000 NMHC Methane/Non-Methane Analyzer
Campbell Scientific CR10 Data Logger w/ A6REL-12 Relay Drive
RM Young Wind Monitor and temperature sensors at Tower
Hobo Pro temperature/RH sensors on Tethered Balloon
2011 National Air Quality Conferences
Long-line Measurements
Dedicated 5/16” ID Teflon® tubing to minimize pressure drop within line at 4 lpm
Four levels, with worst-case residence time of 20 seconds
Tower – 4m, 25m, 50m, 75m
Tethered Balloon – 4m, 33m, 67m, 100m
2011 National Air Quality Conferences
Long-line Measurements
Valved Rotameters
Long-line Measurements
Using solenoid control, sampling switches sequentially to next level every 3 minutes
First two minutes used to purge lines and allow analyzers to stabilize to new sample pressure and concentrations (most critical for THC analzyer)
Final minute averaged
Thus, 12 minute cycle, with each hour consisting of five 1-minute averages
2011 National Air Quality Conferences
UGWOS Tower
UGWOS Tower
UGWOS Tower
UGWOS Tower
UGWOS Tower
Tethered Balloon
Tethered Balloon
Tethered Balloon
Preliminary Data - Tower
Preliminary Data – Tethered Balloon
Preliminary Data – Tethered Balloon
Acknowledgements
Sacramento Metropolitan AQM, California ARB
MSI – Lots of field support, ARS – bulk of the analyzers and support equipment, Sac and ARB – Walnut Grove Tower experience
2011 National Air Quality Conferences
Suggestion for Future Studies – A Bigger Truck