Journal Article

FZJ-2021-05718

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Airborne extractive electrospray mass spectrometry measurements of the chemical composition of organic aerosol

Pagonis, D. ; Campuzano-Jost, P. ; Guo, H. ; Day, D. A. ; Schueneman, M. K. ; Brown, W. L. ; Nault, B. A. ; Stark, H. ; Siemens, K. ; Laskin, A. ; Piel, F. ; Tomsche, L. ; Wisthaler, A. ; Coggon, M. M. ; Gkatzelis, G.FZJ* ; Halliday, H. S. ; Krechmer, J. E. ; Moore, R. H. ; Thomson, D. S. ; Warneke, C. ; Wiggins, E. B. ; Jimenez, J. L. (Corresponding author)

2021
Copernicus Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/29897  doi:10.5194/amt-14-1545-2021

Abstract: 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.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. 2111 - Air Quality (POF4-211) (POF4-211)

Appears in the scientific report 2021

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