TY  - JOUR
AU  - Pagonis, Demetrios
AU  - Campuzano-Jost, Pedro
AU  - Guo, Hongyu
AU  - Day, Douglas A.
AU  - Schueneman, Melinda K.
AU  - Brown, Wyatt L.
AU  - Nault, Benjamin A.
AU  - Stark, Harald
AU  - Siemens, Kyla
AU  - Laskin, Alex
AU  - Piel, Felix
AU  - Tomsche, Laura
AU  - Wisthaler, Armin
AU  - Coggon, Matthew M.
AU  - Gkatzelis, Georgios
AU  - Halliday, Hannah S.
AU  - Krechmer, Jordan E.
AU  - Moore, Richard H.
AU  - Thomson, David S.
AU  - Warneke, Carsten
AU  - Wiggins, Elizabeth B.
AU  - Jimenez, Jose L.
TI  - Airborne extractive electrospray mass spectrometry measurements of the chemical composition of organic aerosol
JO  - Atmospheric measurement techniques
VL  - 14
IS  - 2
SN  - 1867-1381
CY  - Katlenburg-Lindau
PB  - Copernicus
M1  - FZJ-2021-05718
SP  - 1545 - 1559
PY  - 2021
AB  - We deployed an extractive electrospray ionization time-of-flight mass spectrometer (EESI-MS) for airborne measurements of biomass burning aerosol during the Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) study onboard the NASA DC-8 research aircraft. Through optimization of the electrospray working solution, active control of the electrospray region pressure, and precise control of electrospray capillary position, we achieved 1 Hz quantitative measurements of aerosol nitrocatechol and levoglucosan concentrations up to pressure altitudes of 7 km. The EESI-MS response to levoglucosan and nitrocatechol was calibrated for each flight, with flight-to-flight calibration variability of 60 % (1σ). Laboratory measurements showed no aerosol size dependence in EESI-MS sensitivity below particle geometric diameters of 400 nm, covering 82 % of accumulation-mode aerosol mass during FIREX-AQ. We also present a first in-field intercomparison of EESI-MS with a chemical analysis of aerosol online proton-transfer-reaction mass spectrometer (CHARON PTR-MS) and a high-resolution Aerodyne aerosol mass spectrometer (AMS). EESI-MS and CHARON PTR-MS levoglucosan concentrations were well correlated, with a regression slope of 0.94 (R2=0.77). AMS levoglucosan-equivalent concentrations and EESI-MS levoglucosan showed a greater difference, with a regression slope of 1.36 (R2=0.96), likely indicating the contribution of other compounds to the AMS levoglucosan-equivalent measurement. The total EESI-MS signal showed correlation (R2=0.9) with total organic aerosol measured by AMS, and the EESI-MS bulk organic aerosol sensitivity was 60 % of the sensitivity to levoglucosan standards.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000628819900002
DO  - DOI:10.5194/amt-14-1545-2021
UR  - https://juser.fz-juelich.de/record/904148
ER  -