Atmospheric trace gas measurements using ion mobility spectrometer

摘要

Ion mobility spectrometer (IMS) was implemented to measure gas phasecompounds from ambient air in order to study the suitability of thetechnique for on-line atmospheric measurements. The measurements took placeat the SMEAR II station in Hyytiälä, Finland during spring periodson 2008 and 2009. We were able to separate several different atmosphererelated ion mobility peaks form the measured ion mobility distributions. Thehypothetic origins of these peaks are discussed accompanying the comparisonwith earlier trace gas measurements by different techniques. The potentialof the IMS for atmospheric studies utilizing the concept used here was foundout to be in monitoring the overall cleanness of prevailing atmosphericconditions as well as fast detection of the changes of those conditions.With further developing of the technique based on experience gathered inthis study the IMS could be tuned to better respond to current measurementneeds in atmospheric studies.