Estimation of sulfuric acid concentration using ambient ion composition and concentration data obtained with atmospheric pressure interface time-of-flight ion mass spectrometer
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Published:2022-03-31
Issue:6
Volume:15
Page:1957-1965
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Beck Lisa J.ORCID, Schobesberger SiegfriedORCID, Sipilä Mikko, Kerminen Veli-MattiORCID, Kulmala MarkkuORCID
Abstract
Abstract. Sulfuric acid (H2SO4, SA) is the key compound in atmospheric new
particle formation. Therefore, it is crucial to observe its concentration
with sensitive instrumentation, such as chemical ionisation (CI) inlets
coupled to atmospheric pressure interface time-of-flight
(APi-TOF) mass spectrometers. However, there are environmental conditions for which and physical reasons
why chemical ionisation cannot be used, for example in certain remote
places or during flight measurements with limitations regarding chemicals. Here, we
propose a theoretical method to estimate the SA concentration based on
ambient ion composition and concentration measurements that are achieved by
APi-TOF alone. We derive a theoretical expression to estimate the SA
concentration and validate it with accurate CI-APi-TOF observations. Our
validation shows that the developed estimate works well during daytime in
a boreal forest (R2=0.85); however, it underestimates the SA
concentration in, e.g. the Antarctic atmosphere during new particle formation
events where the dominating pathway for nucleation involves sulfuric acid
and a base (R2=0.48).
Funder
Academy of Finland European Research Council
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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