%0 Journal Article
%A Pagonis, Demetrios
%A Campuzano-Jost, Pedro
%A Guo, Hongyu
%A Day, Douglas A.
%A Schueneman, Melinda K.
%A Brown, Wyatt L.
%A Nault, Benjamin A.
%A Stark, Harald
%A Siemens, Kyla
%A Laskin, Alex
%A Piel, Felix
%A Tomsche, Laura
%A Wisthaler, Armin
%A Coggon, Matthew M.
%A Gkatzelis, Georgios
%A Halliday, Hannah S.
%A Krechmer, Jordan E.
%A Moore, Richard H.
%A Thomson, David S.
%A Warneke, Carsten
%A Wiggins, Elizabeth B.
%A Jimenez, Jose L.
%T Airborne extractive electrospray mass spectrometry measurements of the chemical composition of organic aerosol
%J Atmospheric measurement techniques
%V 14
%N 2
%@ 1867-1381
%C Katlenburg-Lindau
%I Copernicus
%M FZJ-2021-05718
%P 1545 - 1559
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000628819900002
%R 10.5194/amt-14-1545-2021
%U https://juser.fz-juelich.de/record/904148