Experiment: 2014 FIXCIT Study_20140114_ISOPRENE/CYCLOHEXANE_Ozone_No Seed_Isoprene + O3, low NO, dry, no seeds
Experiment
Name: 2014 FIXCIT Study_20140114_ISOPRENE/CYCLOHEXANE_Ozone_No Seed_Isoprene + O3, low NO, dry, no seeds
Date: 2014-01-14
Organization
2014 FIXCIT Study
Chamber
Seinfeld chambers
Experiment Set
FIXCIT experiments
Goals
Isolate ozone chemistry from OH chemistry (OHchem should read zero); investigate ozone-related interferences with OH instruments; explore product formation, and compare to 140106 ozonolysis experiment.
Summary
This was as clean of an experiment as we could have hoped. Cyclohexane seemed to scavenge the OH well, as very low signals of OH+isop tracers were observed. GTHOS measured all milestones of the experiment, and observed much higher interference when isoprene was added. The reaction seemed well-mixed in the beginning, leading to less undesired chemistry. The expected ozonolysis products (like HMHP) were observed with CIMS, as well as 1-2 ug/m3 of particles that nucleated. The MAC and MVK traces on the GC-FID appear to be free of interferences. At the end lights were turned on at 100% for 1 h. After lights off, seeds were added for 1 h. Formaldehyde LIF measured successfully today, which is great news. There seemed to be some interference on the GTHOS even though OH was scrubbed, although interferences may be lower than at the end of the HPALD experiment.
Additional Notes
Instrument Status: TD LIF - up PTRMS - up GTHOS - up LIF OHR - operating, but off the bag CRM OHR - up NO CL - up GLY LIP - down FOR LIF - up I/A CIMS - up NCIMS - up RHTO3 - up GC FID - up AMS - up TQC1 - up TQC2 - up TOFCIMS - up Bag Additions: Isoprene, ~100ppb (10uL ISOP, 98% purity), extrapolated to 0 min start time from GC-FID. Ozone ~ 600 ppb Cyclohexane ~ 45 - 50 ppmv Timeline (UTC, hrs): 14:00 - switched GTHOS to N bag 15:00 - GTHOS sampled background air in N bag 15:06 - bag capped, Near bag valve to manual 15:11 - O3/T/RH/NOx sampled on bag 15:19 - Warmed up O3 generator 15:30 - Started injecting O3 17:16 - Turned O3 generator off, still flowing air into the bag 17:25 - turned off Near injection 17:25 - cleaned injection syringes with dichloromethane 17:30 - GTHOS resumed sampling on bag to get O3 background 17:48 - GC-FID started sampling to get background 18:00 - All other instruments started sampling 18:00 - Injected 5.5 mL cyclohexane 18:03 - Started heating injection bulb to get cyclohexane into the bag 18:10 - Stopped injecting air, let mix 18:16 - Injected more O3 18:22 - Stopped O3 injections 18:25 - Stopped injecting air 18:38 - Injected 10 uL isoprene, with vigorous mixing 18:47 - All flows in chamber stopped 24:38 - Lights on (100%) 25:38 - Lights off, continue sampling 26:00 - Started adding in air, and then flushing bag. Most instruments turned off.Experiment Details
Categories:
- Gas phase chemical reaction
Relative Humidity: 5
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Ozone
Initial Oxidant Concentration Value: 605 (parts_per_billion)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure: 750 Torr
Data Sets
Data Set plots
Experiment Set Details
Name: FIXCIT experiments
Time format and units: Seconds past midnight
Description:
The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative study at the atmospheric chambers of Caltech during January 2014. FIXCIT is the laboratory component of SOAS, and is aimed toward (1) better understanding the chemical details behind ambient observations relevant to the southeastern United States, (2) advancing the knowledge of atmospheric oxidation mechanisms of important biogenic hydrocarbons, and (3) characterizing the behavior of field instrumentation using authentic standards. A series of chamber experiments was conducted to investigate the oxidation of isoprene, α-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX). Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized, enabling study of the oxidation mechanisms and instrument responses for these compounds.
Collaborators:
- Allen H. Goldstein UC Berkeley
- William H. Brune Penn State University
- Ronald C. Cohen UC Berkeley
- Delphine K. Farmer Colorado State University
- Manjula R. Canagaratna Aerodyne
- Douglas R. Worsnop Aerodyne
- Jose L. Jimenez University of Colorado Boulder
- Frank N. Keutsch Harvard
- Saewung Kim UC Irvine
- Alex B. Guenther UC Irvine
- John E. Mak SUNY Stonybrook
- Geoffrey S. Tyndall NCAR
- Denise D. Montzka NCAR
- Andrew J. Weinheimer NCAR
- Alam Hasson Fresno State
Contacts
Principal investigators:
Paul O. Wennberg
Phone: 626 395 2447
E-mail: wennberg@caltech.edu
OrcID: 0000-0002-6126-3854
John H. Seinfeld
Phone: 626-395-4635
E-mail: seinfeld@caltech.edu
OrcID: 0000-0003-1344-4068
John D. Crounse
Phone: 626-395-8655
E-mail: crounjd@caltech.edu
OrcID: 0000-0001-5443-729X
Tran B Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359
Data Manager:
Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
20140114_expTimeline.csv
Timeline
| UTC_hr | Action |
| 14:00 | switched GTHOS to N bag |
| 15:00 | GTHOS sampled background air in N bag |
| 15:06 | bag capped. Near bag valve to manual |
| 15:11 | O3/T/RH/NOx sampled on bag |
| 15:19 | Warmed up O3 generator |
| 15:30 | Started injecting O3 |
| 17:16 | Turned O3 generator off; still flowing air into the bag |
| 17:25 | turned off Near injection |
| 17:25 | cleaned injection syringes with dichloromethane |
| 17:30 | GTHOS resumed sampling on bag to get O3 background |
| 17:48 | GC-FID started sampling to get background |
| 18:00 | All other instruments started sampling |
| 18:00 | Injected 5.5 mL cyclohexane |
| 18:03 | Started heating injection bulb to get cyclohexane into the bag |
| 18:10 | Stopped injecting air; let mix |
| 18:16 | Injected more O3 |
| 18:22 | Stopped O3 injections |
| 18:25 | Stopped injecting air |
| 18:38 | Injected 10 uL isoprene with vigorous mixing |
| 18:47 | All flows in chamber stopped |
| 24:38:00 | Lights on (100%) |
| 25:38:00 | Lights off; continue sampling |
| 26:00:00 | Started adding in air; and then flushing bag. Most instruments turned off. |
Citations
Characterizations
2013-12-16 (#17)
Particle Loss Characterizations:
2013-03-07 (#13)
Vapor Loss Characterizations:
2015-05-11 (#6)
Chamber Details
Name: Seinfeld chambers
Volume in cubic meters: 22
Shape: Rectangular Prism
Surface area in cubic meters: 48
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date:
Replacement frequency: As needed
Cleaning method:
Flushing with air
Flushing with air with UV lights on
Oxidation
o3 background: < 0.5 ppb
nox background: 40 ppt
Particle background in micrograms per cubic meter: < 0.01 ug/m3
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 10
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 4
Relative humidity range (max percent): 90
Particle experiment capability: 1
Lights: Yes
Light source type(s):
UV black lamps (350 nm centered)
Supplemental information: https://www.worldscientific.com/doi/abs/10.1142/9789813147355_0001
Additional Notes: