The Four-Wavelength Photoacoustic Aerosol Absorption Spectrometer PAAS-4λ
- 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
- 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.
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Franz Martin Schnaiter et al.
Status: open (until 18 Feb 2023)
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RC1: 'Comment on amt-2022-332', Anonymous Referee #2, 18 Jan 2023
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The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-332/amt-2022-332-RC1-supplement.pdf
Franz Martin Schnaiter et al.
Franz Martin Schnaiter et al.
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