Mobile Atmospheric Chemistry Laboratory

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Merry Long
5 years ago
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1 Mobile Atmospheric Chemistry Laboratory Page 1 of 21

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4 MACL Instrumentation 1. Saturn 4000 gas chromatograph + ion trap mass spectrometer (Varian) 2. Two channel VOC preconcentrator custom build at WSU 3. Two channel NO, NO 2, NOy instrument (October delivery) 4. Fast CO monitor (Aerolaser, Germany) 5. Aerosol Lidar (Leosphere) 6. Two channel Scanning Mobility Particle Sizer (TSI) 7. UV absorption Ozone monitor (Dasibi) 8. Particle in Liquid Sampler (Brechtel) 9. Ion Chromatographs (Metrohm) 10. SO 2 monitor (Teledyne) 11. Meteorological station (Vaisala) Mobile Shelter out for bid ( EKTO Manufacturing) Page 4 of 21

5 MACL Layout Page 5 of 21

PTR-MS Example measurements in Houston impact of industrial emissions? real-time VOC measurements of a broad range of VOCs including oxygenated compounds.

6 PTR-MS Example measurements in Houston impact of industrial emissions? real-time VOC measurements of a broad range of VOCs including oxygenated compounds. High time resolution can track ambient variability and indentify industrial plumes. High time resolution data lends itself to meteorological interpretation. Page 6 of 21

VOC Analysis by GC-ITMS Slower speciated VOC measurements compliments PTR-MS data The design calls for in-situ, automated analysis for C 2 -C 12 VOCs using a custom built 2-channel preconcentrator.

7 VOC Analysis by GC-ITMS Slower speciated VOC measurements compliments PTR-MS data The design calls for in-situ, automated analysis for C 2 -C 12 VOCs using a custom built 2-channel preconcentrator. Channel 1: Analysis of C 2 -C 6 hydrocarbons by GC-FID Channel 2: Analysis of C 2 -C 12 VOCs by GC-ITMS (EI or CI ionization possible) Design goals: ½ hr per sample. low pptv detection limits (ion trap has femtogram sensitivity) unattended operation Expected test date: next summer Page 7 of 21

Fast CO Monitor Measuring range: up to 100,000.00 ppbv Detection limit: < 0.80 ppbv at Integration time = 10 s Sensitivity: about 30 to 100 counts/ppbv Time constant: about 0.

8 Fast CO Monitor Measuring range: up to 100, ppbv Detection limit: < 0.80 ppbv at Integration time = 10 s Sensitivity: about 30 to 100 counts/ppbv Time constant: about 0.1 sec (10 90 %), signal delay 2 sec Background check: internal zero trap Calibration: using CO gas standard in synthetic Air Fast, high sensitivity CO measurement Surface fluxes of CO by eddy covariance possible. Quantifies dynamic range of CO mixing ratios in atmosphere. Precise measure of CO / NOy, and CO / NOx ratios Page 8 of 21

9 Particle Size Distribution System Particle number size distribution from microns. Easy to convert to volume or surface area distributions. System consists of 2 scanning mobility particle sizers and an aerodynamic particle sizer. Time resolution variable, on the order of 10 minutes. Brock et al Page 9 of 21

10 Time Series PSD Data Courtesy M. Boy Page 10 of 21

Particle-Into-Liquid-Sampler Collects water

11 Particle-Into-Liquid-Sampler Collects water soluble aerosol material in a series of vials. Later analysis by ion chromatography and/or total organic carbon analysis. Former provides inorganic ions (SO 2-4, NO 3-, Cl -, NH 4+, Na +, K +, etc.). Latter provides water-soluble organic carbon. Detection limit ~0.1 µg/m 3. Time resolution: min. Can be fitted with PM 1.0 or PM 2.5 pre-impantor. Very time & labor intensive. Page 11 of 21

12 PILS Schematic Page 12 of 21

13 PILS Measurement Capabilities Orsini et al Page 13 of 21

14 Preliminary PILS-WSOC Data Manitou Forest, CO 6 4 WSOC [ug C/m3] 2 0 7/23/2008 7/25/2008 7/27/2008 7/29/2008 Date Page 14 of 21

15 Aerosol Lidar (Leosphere ALS300) Page 15 of 21

16 Lidar Capabilities Page 16 of 21

17 Remote Communications Control and monitor instruments from office Access to data from class rooms for instruction First full test: Boise Field study this winter Page 17 of 21

18 MACL Field Operations Planned 12/08: Treasure Valley PM2.5 Precursors Study 04/09: Houston VOC Emissions Proposed 2009: Forest VOCs & SOA Formation (Michigan) 2010: Urban Footprint (Arizona) 2010: Air Quality / Climate Change Interactions (California) 2010: Windblown Dust (Columbia Plateau) 2011: Nitrogen Cycling (PNW) Page 18 of 21

19 Efforts for Additional Instrumentation: Aerosol Mass Spectrometer Canagaratna et al Page 19 of 21

20 AMS Baseline Data Canagaratna et al Page 20 of 21

21 AMS: Advanced Data Availability Canagaratna et al Page 21 of 21

22 Actinic Flux Spectrograph Measurements of J(O3) and J(NO2) Stay tuned! Page 22 of 21

Monoterpene and Sesquiterpene Emissions from Ponderosa Pine: Implications for Secondary Organic Aerosol Formation

Monoterpene and Sesquiterpene Emissions from Ponderosa Pine: Implications for Secondary Organic Aerosol Formation Anita Lee, Gunnar Schade, Allen Goldstein UC Berkeley GCEP Workshop: August 19, 2002 What