Fig. 5: Aerosol organic composition, acidity and MSA partitioning.
From: A central arctic extreme aerosol event triggered by a warm air-mass intrusion
A Relationship between the estimated hydrogen-to-carbon (H:C) and oxygen-to-carbon (O:C) ratios of organic species as Van Krevelen diagram. The ellipse represents data points below 300 m altitude in the summertime Canadian Arctic measured by Willis et al.55. Blue lines are from Ng et al. 53, representative of mid-latitude ambient O:C and H:C ratios. “All data” refers to data points during April 2020. B Methane sulfonic acid (MSA) partitioning (measured gas phase to total MSA) as a function of aerosol acidity approximated by NH4+ balance colored with particle phase MSA measured with the HR-AMS.
