The Interaction of Mineral Dust with Gas-Phase HMO3 and SO2 during the MINATROC II Field Campaign: First Estimate of the Uptake Coefficient yHNO3 from Atmospheric Data

Abstract

Within the second part of the MINATROC project (MINeral dust And TROpospheric Chemistry) we investigated the interaction of mineral dust with gaseous HNO3 and SO2. The measurements were performed at Izana, Tenerife, 2367 m asl) using the highly sensitive Chemical Ionization Mass Spectrometry technique. During six periods of high atmospheric dust load, the HNO3 concentration decreased with increasing dust concentrations. From the HNO3 decrease, the uptake coefficient for HNO3 was calculated and found to vary between 0.017 and 0.054. Moreover, during the dust events a significant decrease of ozone (O3) was detected. We conclude that this decrease is only due to the HNO3 depletion and that no significant uptake of O3 on dust occurred. A general interaction between SO2 and mineral dust were detected.JRC.H.2-Climate chang