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| Titel |
Development of an H-TDMA for long-term unattended measurement of the hygroscopic properties of atmospheric aerosol particles |
| VerfasserIn |
E. Nilsson, E. Swietlicki, S. Sjogren, J. Löndahl, M. Nyman, B. Svenningsson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 2, no. 1 ; Nr. 2, no. 1 (2009-06-30), S.313-318 |
| Datensatznummer |
250000446
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| Publikation (Nr.) |
 copernicus.org/amt-2-313-2009.pdf |
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| Zusammenfassung |
| 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 (http://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 H-TDMA 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. When measuring growth
factors of ammonium sulphate, the new H-TDMA system was found to measure
within a growth factor deviation of ±0.05 compared to previously
recorded data by Tang et al. (1994). The long term RH of the system has been
found stable at 90.0% with a standard deviation of ±0.23% and
an average temperature variability of the second DMA less than ±0.1 K.
Daily automated ammonium sulphate measurements have validated the ambient
measurements. The instrument is operated at the EMEP/EUSAAR background
station Vavihill in the southern part of Sweden. |
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