Publication: Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds

Publication - Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds

Title: Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds
DOI: 10.5194/acp-14-13531-2014
Publication Year: 2014
Author list: Nguyen, T. B., Crounse, J. D., Schwantes, R. H., Teng, A. P., Bates, K. H., Zhang, X., St. Clair, J. M., Brune, W. H., Tyndall, G. S., Keutsch, F. N., Seinfeld, J. H., Wennberg, P. O.
Journal Short Name: Atmos. Chem. Phys
Publisher: Copernicus

Abstract
The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative atmospheric chamber campaign that occurred during January 2014. FIXCIT is the laboratory component of a synergistic field and laboratory effort 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. Approximately 20 principal scientists from 14 academic and government institutions performed parallel measurements at a forested site in Alabama and at the atmospheric chambers at Caltech. During the 4 week campaign period, a series of chamber experiments was conducted to investigate the dark- and photo-induced oxidation of isoprene, α-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX) in a highly controlled and atmospherically relevant manner. Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized and contributed by campaign participants, which enabled explicit exploration into the oxidation mechanisms and instrument responses for these important atmospheric compounds. The present overview describes the goals, experimental design, instrumental techniques, and preliminary observations from the campaign. This work provides context for forthcoming publications affiliated with the FIXCIT campaign. Insights from FIXCIT are anticipated to aid significantly in interpretation of field data and the revision of mechanisms currently implementedin regional and global atmospheric models.

Additional Notes



Experiments (26)

ID Name Start date Experiment Category Reaction Type Reactant(s) Oxidant Name Temperature Humidity Type of Seed RO2 Main Fate Data Sets (count) Actions
94 2014 FIXCIT Study_20140106_Isoprene/Ozone/Water_Hydroxyl radical_No Seed_Isoprene + OH + O3, low NO, dry, no seeds 2014-01-06 Gas phase chemical reaction Photooxidation Isoprene, Ozone, Water Hydroxyl radical 25 5 No Seed HO2 11 Download
95 2014 FIXCIT Study_20140113_ALPHA-PINENE/nitric oxide/OZONE/formaldehyde_Nitrate radical_Ammonium sulfate_HO2 fate, dry RH, seed added at end 2014-01-13 Gas phase chemical reaction Dark oxidation ALPHA-PINENE, nitric oxide, OZONE, formaldehyde Nitrate radical 25 5 Ammonium sulfate HO2 12 Download
97 2014 FIXCIT Study_20140111_nitric oxide/ALPHA-PINENE/hydrogen peroxide_Hydroxyl radical_No Seed_Alpha-pinene + OH, high NO, dry, (NH4)2SO4 seed at end 2014-01-11 Gas phase chemical reaction Photooxidation nitric oxide, ALPHA-PINENE, hydrogen peroxide Hydroxyl radical 26 5 NO 13 Download
390 2014 FIXCIT Study_20140117_4-hydroxy 3-peroxy ISOPOOH_Hydroxyl radical_No Seed_4,3-ISOPOOH + OH, low NO, dry, no seeds 2014-01-17 Gas phase chemical reaction Photooxidation 4-hydroxy 3-peroxy ISOPOOH Hydroxyl radical 25 5 HO2 14 Download
391 2014 FIXCIT Study_20140102_ISOPRENE/hydrogen peroxide_Hydroxyl radical_No Seed_Isoprene + OH, low NO, dry, no seeds 2014-01-02 Gas phase chemical reaction Photooxidation ISOPRENE, hydrogen peroxide Hydroxyl radical 27 5 HO2 10 Download
392 2014 FIXCIT Study_20140103_ISOPRENE/nitric oxide/hydrogen peroxide_Hydroxyl radical_No Seed_Isoprene + OH, high NO, dry, no seeds 2014-01-03 Gas phase chemical reaction Photooxidation ISOPRENE, nitric oxide, hydrogen peroxide Hydroxyl radical 26 5 NO 9 Download
393 2014 FIXCIT Study_20140104_1-hydroxy-2-hydroperoxy ISOPOOH/hydrogen peroxide_Hydroxyl radical_No Seed_Blank H2O2 + hv (low-NO "near" bag) and ISOPOOH calibrations 2014-01-04 Blank/Control Photooxidation 1-hydroxy-2-hydroperoxy ISOPOOH, hydrogen peroxide Hydroxyl radical 24-33 5 HO2 11 Download
394 2014 FIXCIT Study_20140105_4-hydroxy-3-nitrooxy ISOPN/hydrogen peroxide_Hydroxyl radical_No Seed_Blank H2O2 + hv (high-NO "far" bag) and isoprene hydroxynitrate calibrations 2014-01-05 Blank/Control Photooxidation 4-hydroxy-3-nitrooxy ISOPN, hydrogen peroxide Hydroxyl radical 24-27 5 HO2 12 Download
396 2014 FIXCIT Study_20140110_ALPHA-PINENE/hydrogen peroxide_Hydroxyl radical_No Seed_Alpha-pinene + OH, low NO, dry, (NH4)2SO4 seed at end 2014-01-10 Gas phase chemical reaction Photooxidation ALPHA-PINENE, hydrogen peroxide Hydroxyl radical 27 5 HO2 13 Download
397 2014 FIXCIT Study_20140114_ISOPRENE/CYCLOHEXANE_Ozone_No Seed_Isoprene + O3, low NO, dry, no seeds 2014-01-14 Gas phase chemical reaction Photooxidation ISOPRENE, CYCLOHEXANE Ozone 25 5 HO2 12 Download
398 2014 FIXCIT Study_20140107_ISOPRENE/Methyl nitrite_Hydroxyl radical_No Seed_Isoprene + OH "slow chemistry" (isomerization), dry, 40C, no seeds 2014-01-07 Gas phase chemical reaction Photooxidation ISOPRENE, Methyl nitrite Hydroxyl radical 40 5 Autoxidation/Isomerization 13 Download
399 2014 FIXCIT Study_20140109_ISOPRENE/Nitrogen dioxide/Ozone/Formaldehyde_Nitrate radical_N/A_Isoprene + NO3/HO2, dry, no seed 2014-01-09 Gas phase chemical reaction Dark oxidation ISOPRENE, Nitrogen dioxide, Ozone, Formaldehyde Nitrate radical 26 5 N/A HO2 13 Download
400 2014 FIXCIT Study_20140125_METHACROLEIN/hydrogen peroxide_Hydroxyl radical_Ammonium sulfate_Methacrolein + OH, low NO, dry, (NH4)2SO4 seed at end 2014-01-25 Gas phase chemical reaction, Aerosol formation Photooxidation METHACROLEIN, hydrogen peroxide Hydroxyl radical 28 5 Ammonium sulfate HO2 14 Download
401 2014 FIXCIT Study_20140126_METHACROLEIN/nitrogen dioxide/methyl nitrite/methacrylic acid epoxide_Hydroxyl radical_Ammonium sulfate_Methacrolein + OH, high NO, dry, then humidify and add (NH4)2SO4 seed at end 2014-01-26 Gas phase chemical reaction, Aerosol formation Photooxidation METHACROLEIN, nitrogen dioxide, methyl nitrite, methacrylic acid epoxide Hydroxyl radical 26 5 Ammonium sulfate NO2 15 Download
403 2014 FIXCIT Study_20140116_ALPHA-PINENE/Methyl nitrite_Hydroxyl radical_No Seed_Alpha-pinene + OH "slow chemistry", dry, 40C, no seeds 2014-01-16 Gas phase chemical reaction Photooxidation ALPHA-PINENE, Methyl nitrite Hydroxyl radical 40 5 Autoxidation/Isomerization 13 Download
404 2014 FIXCIT Study_20140119_/ISOPRENE/4-hydroxy-3-hydroperoxy ISOPOOH/hydrogen peroxide_Hydroxyl radical_Ammonium sulfate_Isoprene and 4,3-ISOPOOH + OH, low NO, 50% humidity, (NH4)2SO4 seeds 2014-01-19 Gas phase chemical reaction, Aerosol formation Photooxidation Aerosol , ISOPRENE, 4-hydroxy-3-hydroperoxy ISOPOOH, hydrogen peroxide Hydroxyl radical 28 51 Ammonium sulfate HO2 13 Download
405 2014 FIXCIT Study_20140121_ISOPRENE/hydrogen peroxide_Hydroxyl radical_No Seed_Isoprene + OH, low NO, dry, no seeds, lower initial concentration 2014-01-21 Gas phase chemical reaction Photooxidation ISOPRENE, hydrogen peroxide Hydroxyl radical 27 5 HO2 14 Download
406 2014 FIXCIT Study_20140123_ISOPRENE/OZONE_Hydroxyl radical_No Seed_Isoprene + OH + O3, low NO, 50% humidity, no seeds 2014-01-23 Gas phase chemical reaction Photooxidation ISOPRENE, OZONE Hydroxyl radical 25 50 HO2 13 Download
407 2014 FIXCIT Study_20140124_4-hydroxy-3-nitrooxy ISOPN/Methyl nitrite/nitric oxide/_Hydroxyl radical_Ammonium sulfate_4,3-isoprene hydroxynitrate + OH, high NO, 50% RH, (NH4)2SO4 seed 2014-01-24 Gas phase chemical reaction, Aerosol formation Photooxidation 4-hydroxy-3-nitrooxy ISOPN, Methyl nitrite, nitric oxide, Aerosol Hydroxyl radical 26 52 Ammonium sulfate NO 13 Download
408 2014 FIXCIT Study_20140127_trans-beta-IEPOX/methyl nitrite_Hydroxyl radical_No Seed_Trans-beta-IEPOX + OH, moderate NO, dry, no seeds 2014-01-27 Gas phase chemical reaction Photooxidation trans-beta-IEPOX, methyl nitrite Hydroxyl radical 25 5 NO 13 Download
409 2014 FIXCIT Study_20140129_isoprene/ozone/CYCLOHEXANE_Ozone_No Seed_Isoprene + O3, cyclohexane OH scrubber, 50% humidity, no seeds 2014-01-29 Gas phase chemical reaction Photooxidation isoprene, ozone, CYCLOHEXANE Ozone 25 58 Not Sure 13 Download
410 2014 FIXCIT Study_20140130_PINONALDEHYDE/Pinonic acid/Methyl nitrite_Hydroxyl radical_No Seed_Pinonaldehyde + OH, moderate NO, dry, no seeds 2014-01-30 Gas phase chemical reaction Photooxidation PINONALDEHYDE, Pinonic acid, Methyl nitrite Hydroxyl radical 26 5 NO 11 Download
411 2014 FIXCIT Study_20140201_OZONE/CYCLOHEXANE_Ozone_No Seed_Characterization of GTHOS artifact with O3, HO2, and cyclohexane, 30% humidity, no seeds 2014-02-01 Instrument/Chamber characterization Photooxidation OZONE, CYCLOHEXANE Ozone 25 31 Not Sure 4 Download
926 2014 FIXCIT Study_20140128_Isoprene/Methyl nitrite_Hydroxyl radical_No Seed 2014-01-28 Gas phase chemical reaction Photooxidation Isoprene, Methyl nitrite Hydroxyl radical 25 5 No Seed NO 16 Download