Atmospheric measurements of gas-phase HNO3 and SO2 using chemical ionization mass spectrometry during the MINATROC field campaign 2000 on Monte Cimone

[摘要] The EU-project MINATROC (MINeral dust And TROpospheric Chemistry) aims at enablingan estimation of the influence of mineral dust, a major, but to date largely ignored componentof tropospheric aerosol, on tropospheric oxidant cycles. Within the scope of this projectcontinuous atmospheric measurements of gas-phase HNO₃ and SO₂ were conducted in Juneand July 2000 at the CNR WMO station, situated on Monte Cimone (MTC)(44°11' N --10°42' E, 2165 m asl), Italy. African air transporting dust is occasionally advected over theMediterranean Sea to the site, thus mineral aerosol emitted from Africa will encounterpolluted air masses and provide ideal conditions to study their interactions.HNO₃ and SO₂ were measured with an improved CIMS (chemical ionization mass spectrometry) system forground-based measurements that was developed and built at MPI-K Heidelberg. SinceHNO₃ is a very sticky compound special care was paid for the air-sampling and background-measurementsystem. Complete data sets could be obtained before, during and after majordust intrusions. For the first time these measurements might provide a strong observationalindication of efficient uptake of gas-phase HNO₃ by atmospheric mineral-dust aerosolparticles.

[学科分类] 大气科学