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@ARTICLE{Pagonis:904148,
      author       = {Pagonis, Demetrios and Campuzano-Jost, Pedro and Guo,
                      Hongyu and Day, Douglas A. and Schueneman, Melinda K. and
                      Brown, Wyatt L. and Nault, Benjamin A. and Stark, Harald and
                      Siemens, Kyla and Laskin, Alex and Piel, Felix and Tomsche,
                      Laura and Wisthaler, Armin and Coggon, Matthew M. and
                      Gkatzelis, Georgios and Halliday, Hannah S. and Krechmer,
                      Jordan E. and Moore, Richard H. and Thomson, David S. and
                      Warneke, Carsten and Wiggins, Elizabeth B. and Jimenez, Jose
                      L.},
      title        = {{A}irborne extractive electrospray mass spectrometry
                      measurements of the chemical composition of organic aerosol},
      journal      = {Atmospheric measurement techniques},
      volume       = {14},
      number       = {2},
      issn         = {1867-1381},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2021-05718},
      pages        = {1545 - 1559},
      year         = {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.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {2111 - Air Quality (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000628819900002},
      doi          = {10.5194/amt-14-1545-2021},
      url          = {https://juser.fz-juelich.de/record/904148},
}