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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-3
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-3
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Feb 2020

20 Feb 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

In-situ cloud ground based measurements in Finnish sub-Arctic: Intercomparison of three cloud spectrometers

Konstantinos-Matthaios Doulgeris1, Mika Komppula2, Sami Romakkaniemi2, Antti-Pekka Hyvärinen1, Veli-Matti Kerminen3, and David Brus1 Konstantinos-Matthaios Doulgeris et al.
  • 1Finnish Meteorological Institute, PO Box 503, FI-00101, Helsinki, Finland
  • 2Finnish Meteorological Institute, PO Box 1627, FI-70211, Kuopio, Finland
  • 3Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Finland

Abstract. Continuous, semi-long term, ground based, in-situ cloud measurements were conducted during the Pallas Cloud Experiment (PaCE) in 2013. The measurements were carried out in Finnish sub-Arctic region at Sammaltunturi station (67°58'N, 24°07'E, and 560 m a.s.l.), the part of Pallas Atmosphere – Ecosystem Supersite and Global Atmosphere Watch (GAW) programme. The main motivation of the campaign was to conduct in-situ cloud measurements with three different cloud spectrometer probes and perform an evaluation of their ground based setups. Therefore, we mutually compared the performance of the Cloud and Aerosol Spectrometer (CAS), the Cloud Droplet Probe (CDP) and the Forward Scattering Spectrometer Probe (FSSP-100), (DMT, Boulder, CO, USA). We investigated how different meteorological parameters affect each instrument operation and quantified possible biases and discrepancies of different microphysical cloud properties. Based on obtained results we suggested limitations for further use of the instruments in campaigns where focus is on investigating aerosol cloud interactions. Measurements in this study were made by Finnish Meteorological Institute owned instruments and results concern their operation in sub-Arctic conditions with frequently occurring super-cooled clouds.

Measured parameter from each instrument was the size distribution and additionally we derived the number concentration, the effective diameter, the median volume diameter and the liquid water content. A complete intercomparison between the CAS probe and the FSSP-100 and additionally between the FSSP-100 and the CDP probe was made and presented. Unfortunately, there was not sufficient amount of common data to compare all three probes together due to operational problems of the CDP ground setup in sub-zero conditions. The CAS probe that was fixed to one direction lost significant number of cloud droplets when the wind direction was out of wind iso axial conditions in comparison with the FSSP-100 and the CDP which were both placed on a rotating platform. We revealed that CAS and FSSP-100 had good agreement in deriving sizing parameters (effective diameter and median volume diameter from 5 to 35 µm) even though CAS was losing a significant amount of cloud droplets. The most sensitive derived parameter was liquid water content which was strongly connected to the wind direction and temperature.

Konstantinos-Matthaios Doulgeris et al.

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Konstantinos-Matthaios Doulgeris et al.

Konstantinos-Matthaios Doulgeris et al.

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Latest update: 23 Sep 2020
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Short summary
We intercompared three cloud spectrometers in conditions with frequently occurring super-cooled clouds. The measurements were conducted during the Pallas Cloud Experiment (PaCE) in 2013, in Finnish sub-Arctic region at Sammaltunturi station. The main meteorological parameters influenced the spectrometers performance was the wind direction. Final recommendations and our view on the main limitations of each spectrometer ground setup are presented.
We intercompared three cloud spectrometers in conditions with frequently occurring super-cooled...
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