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000904148 1001_ $$00000-0002-0441-2614$$aPagonis, Demetrios$$b0
000904148 245__ $$aAirborne extractive electrospray mass spectrometry measurements of the chemical composition of organic aerosol
000904148 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2021
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000904148 520__ $$aWe 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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000904148 7001_ $$00000-0003-3930-010X$$aCampuzano-Jost, Pedro$$b1
000904148 7001_ $$00000-0003-0487-3610$$aGuo, Hongyu$$b2
000904148 7001_ $$00000-0003-3213-4233$$aDay, Douglas A.$$b3
000904148 7001_ $$00000-0003-4359-1472$$aSchueneman, Melinda K.$$b4
000904148 7001_ $$0P:(DE-HGF)0$$aBrown, Wyatt L.$$b5
000904148 7001_ $$00000-0001-9464-4787$$aNault, Benjamin A.$$b6
000904148 7001_ $$0P:(DE-HGF)0$$aStark, Harald$$b7
000904148 7001_ $$0P:(DE-HGF)0$$aSiemens, Kyla$$b8
000904148 7001_ $$00000-0002-7836-8417$$aLaskin, Alex$$b9
000904148 7001_ $$00000-0002-8191-8029$$aPiel, Felix$$b10
000904148 7001_ $$0P:(DE-HGF)0$$aTomsche, Laura$$b11
000904148 7001_ $$0P:(DE-HGF)0$$aWisthaler, Armin$$b12
000904148 7001_ $$0P:(DE-HGF)0$$aCoggon, Matthew M.$$b13
000904148 7001_ $$0P:(DE-Juel1)184937$$aGkatzelis, Georgios$$b14$$ufzj
000904148 7001_ $$00000-0001-9499-9836$$aHalliday, Hannah S.$$b15
000904148 7001_ $$00000-0003-3642-0659$$aKrechmer, Jordan E.$$b16
000904148 7001_ $$00000-0003-2911-4469$$aMoore, Richard H.$$b17
000904148 7001_ $$0P:(DE-HGF)0$$aThomson, David S.$$b18
000904148 7001_ $$0P:(DE-HGF)0$$aWarneke, Carsten$$b19
000904148 7001_ $$0P:(DE-HGF)0$$aWiggins, Elizabeth B.$$b20
000904148 7001_ $$00000-0001-6203-1847$$aJimenez, Jose L.$$b21$$eCorresponding author
000904148 773__ $$0PERI:(DE-600)2505596-3$$a10.5194/amt-14-1545-2021$$gVol. 14, no. 2, p. 1545 - 1559$$n2$$p1545 - 1559$$tAtmospheric measurement techniques$$v14$$x1867-1381$$y2021
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