Mobility

Development of an H-TDMA for Long-Term Unattended Measurement of the Hygroscopic Properties of Atmospheric Aerosol Particles

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Executive Summary

A new hygroscopic tandem differential mobility analyzer (H-TDMA) has been constructed at Lund University within the frameworks of the EU FP6 Infrastructure Project EUSAAR (www.eusaar.org). The aim of this coordinated H-TDMA development is to design and evaluate a new generation of H-TDMAs that are capable of conducting long term measurements of the hygroscopic growth and state of mixing of sub-micrometer atmospheric aerosol particles at the EUSAAR aerosol super-sites across Europe. The HTDMA constructed for this project has been validated with respect to hygroscopic growth factor, stability of Relative Humidity (RH), temperature stability and its ability to operate unattended for longer periods of time.

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