The four-wavelength Photoacoustic Aerosol Absorption Spectrometer (PAAS-4λ)

Autor: F. M. Schnaiter, C. Linke, E. Asmi, H. Servomaa, A.-P. Hyvärinen, S. Ohata, Y. Kondo, E. Järvinen
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Atmospheric Measurement Techniques, Vol 16, Pp 2753-2769 (2023)
Druh dokumentu: article
ISSN: 1867-1381
1867-8548
DOI: 10.5194/amt-16-2753-2023
Popis: In this paper, the Photoacoustic Aerosol Absorption Spectrometer (PAAS-4λ) is introduced. PAAS-4λ was specifically developed for long-term monitoring tasks in (unattended) air quality stations. It uses four wavelengths coupled to a single acoustic resonator in a compact and robust set-up. The instrument has been thoroughly characterized and carefully calibrated in the laboratory using NO2/air mixtures and Nigrosin aerosol. It has an ultimate 1σ detection limit below 0.1 Mm−1, at a measurement precision and accuracy of 3 % and 10 %, respectively. In order to demonstrate the PAAS-4λ suitability for long-term monitoring tasks, the instrument is currently validated at the air quality monitoring station Pallas in Finland, about 140 km north of the Arctic circle. A total of 11 months of PAAS-4λ data from this deployment are presented and discussed in terms of instrument performance. Intercomparisons with the filter-based photometers of a continuous soot monitoring system (COSMOS), the Multi-Angle Absorption Photometer (MAAP), and Aethalometer (AE33) demonstrate the capabilities and value of PAAS-4λ, as well as for the validation of the widely used filter-based instruments.
Databáze: Directory of Open Access Journals
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