Resumen de Building and Tuning-up of an HTDMA and its First Measurements in an Urban Background Area
Elisabeth Alonso Blanco, Francisco Javier Gómez Moreno, S. Sjogren, Begoña Artiñano Rodríguez de Torres
In this work the building and tuning-up of a custom-built HTDMA is described. This equipment has been built at CIEMAT, based on EUSAAR HTDMA standards, allowing us to measure a maximum growth factor of 2.2 for particle sizes up to 265 nm, between 10 to 98% RH. The accuracy and quality of the measurements have been validated by pure ammonium sulphate aerosol. The first measurements have been carried out at an urban background station located in the CIEMAT facilities in Madrid during October 2013. A remarkable dependence between particle size and the growth factor is observed. The largest particle sizes have a greater growth factor possibly as a result of aging of aerosols, which determines their chemical composition. This agrees with the observed daily pattern of the growth factor associated with emissions from anthropogenic combustion processes.
