02 Jan 2023
02 Jan 2023
Status: this preprint is currently under review for the journal AMT.

The Four-Wavelength Photoacoustic Aerosol Absorption Spectrometer PAAS-4λ

Franz Martin Schnaiter1,2, Claudia Linke1, Eija Asmi3, Henri Servomaa3, Antti-Pekka Hyvärinen3, Sho Ohata4,5, Yutaka Kondo6, and Emma Järvinen1 Franz Martin Schnaiter et al.
  • 1Karlsruhe Institute of Technology, Kaiserstraße 12, 76021 Karlsruhe, Germany
  • 2schnaiTEC GmbH, Werner-von-Siemens-Str. 2-6, 76646 Bruchsal, Germany
  • 3Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
  • 4Institute for Space–Earth Environmental Research, Nagoya University, Nagoya, Aichi, Japan
  • 5Institute for Advanced Research, Nagoya University, Nagoya, Aichi, Japan
  • 6National Institute of Polar Research, Tokyo, Japan

Abstract. 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 0.1Mm-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. Eleven months of PAAS-4λ data from this deployment are presented and discussed in terms of instrument performance. Intercomparisons with the filter-based photometers COSMOS, MAAP, and AE33 demonstrate the capabilities and value of PAAS-4λ, also for the validation of the widely used filter-based instruments.

Franz Martin Schnaiter et al.

Status: open (until 18 Feb 2023)

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Franz Martin Schnaiter et al.

Franz Martin Schnaiter et al.


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Short summary
Light absorbing particles from combustion processes are important contributors to climate warming. Their highly variable spectral light absorption properties need to be monitored in the field. Commonly used methods show measurement artefacts that are difficult to correct. We introduce a new instrument that is based on the photoacoustic effect. A long-term operation in the Finnish Arctic demonstrate the applicability of the new instrument for unattended light absorption monitoring.