Iodic acid, sulfuric acid and methanesulfonic acid collected during the Arctic Ocean 2018 expedition

Andrea Baccarini, Julia Schmale
2020
Ensemble de données

Measurements of iodic acid, sulfuric acid and methanesulfonic acid concentration in the gas phase obtained with a nitrate chemical ionization mass spectrometer (we used an APi-TOF mass spectrometer produced by Tofwerk AG coupled with a Chemical ionization inlet A70 produced by Airmodus). These three species are of fundamental importance in the atmosphere because they participate in both new particle formation and growth affecting the Earth radiative balance and cloud properties. Iodic acid is mainly produced from the oxidation of the iodine molecule whereas both sulfuric and methanesulfonic acid are produced from the oxidation of dimethyl sulfide. Measurements were performed on the 4th deck of icebreaker Oden during August and September 2018 along the track of the expedition. Concentrations are reported as molecules per cubic centimeter in ten minutes averages.

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Andrea Baccarini, Julia Schmale
2020
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https://infoscience.epfl.ch/record/283446?ln=fr

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Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition

Andrea Baccarini, Robin Lewis Modini, Julia Schmale

During summer, the Southern Ocean is largely unaffected by anthropogenic emissions, which makes this region an ideal place to investigate marine natural aerosol sources and processes. A better understanding of natural aerosol is key to constrain the preindustrial aerosol state and reduce the aerosol radiative forcing uncertainty in global climate models. We report the concentrations of gaseous sulfuric acid, iodic acid, and methanesulfonic acid (MSA) together with a characterization of new particle formation (NPF) events over a large stretch of the Southern Ocean. Measurements were conducted on board the Russian icebreaker Akademik Tryoshnikov from January to March 2017. Iodic acid is characterized by a particular diurnal cycle with reduced concentration around noon, suggesting a lower formation yield when solar irradiance is higher. Gaseous MSA does not have a diurnal cycle and measured concentrations in gas and condensed phase are compatible with this species being primarily produced via heterogeneous oxidation of dimethyl sulfide and subsequent partitioning into the gas phase. We also found that NPF in the boundary layer is mainly driven by sulfuric acid but it occurred very rarely over the vast geographical area probed and did not contribute to the cloud condensation nuclei budget in a directly observable manner. Despite the near absence of NPF events in the boundary layer, Aitken mode particles were frequently measured, supporting the hypothesis of a free tropospheric source. Iodic acid and MSA were not found to participate in nucleation, however, MSA may contribute to aerosol growth via heterogeneous formation in the aqueous phase.

2021

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Acide sulfurique

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Forçage radiatif

En climatologie, le forçage radiatif est approximativement défini comme la différence entre la puissance radiative reçue et la puissance radiative émise par un système climatique donné, comme le syst

Sulfure de diméthyle

Le sulfure de diméthyle ou diméthylsulfure (DMS) est un composé organosulfuré de formule (CH3)2S. C'est un liquide volatil, inflammable, insoluble dans l'eau et dont la caractéristique principale es