Preprints
https://doi.org/10.5194/amt-2021-104
https://doi.org/10.5194/amt-2021-104

  21 Apr 2021

21 Apr 2021

Review status: this preprint is currently under review for the journal AMT.

Comparison of mid-latitude single and mixed-phase cloud optical depth from co-located infrared spectrometer and backscatter LiDAR measurements

Gianluca Di Natale1, Marco Barucci1, Claudio Belotti1, Giovanni Bianchini1, Francesco D'Amato2, Samuele Del Bianco2, Marco Gai2, Alessio Montori1, Ralf Sussmann3, Silvia Viciani1, Hannes Vogelmann3, and Luca Palchetti1 Gianluca Di Natale et al.
  • 1National Institute of Optics, Via Madonna del Piano 10, Sesto Fiorentino, Firenze, Italy
  • 2Institute of Applied Physics, Via Madonna del Piano 10, Sesto Fiorentino, Firenze, Italy
  • 3Karlsruhe Institute of Technology, IMK-IFU, Garmisch-Partenkirchen, Germany

Abstract. The longwave downwelling spectral radiance measurements performed by means of the Far-Infrared Radiation Mobile Observation System (FIRMOS) spectrometer at the summit of the Mt. Zugspitze (German Alps) in the Winter 2018–2019, allowed to retrieve the optical and micro-physical properties of ice, mixed and water clouds, showing a good agreement of the statistical relationship between the ice water path and the ice optical depth with the ones from previous works. In this paper the optical depths retrieved from FIRMOS are initially compared with selected cases calculated from backscattering Light Detection And Ranging (LiDAR) data by using a transmittance method. Then, in order to compare the whole FIRMOS dataset, the power-law relationship between backscattering and extinction is used to apply the Klett method and automatize the routine. Minimizing the root mean square differences, the exponent of the relationship, the so called backscatter-extinction coefficient ratio, is assessed to be 0.85 with a variabiliy in the range 0.60–1.10 for ice clouds and 0.50 with a variability within 0.30–0.70 for mixed and water clouds.

Gianluca Di Natale et al.

Status: open (until 16 Jun 2021)

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Gianluca Di Natale et al.

Gianluca Di Natale et al.

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Short summary
The importance of the cirrus and mixed phase clouds in the Earth Radiation Budget has been proven by many studies, since they interact with the shortwave and thermal radiation coming from the sun and the Earth. In this paper the main properties which characterize cirrus clouds are retrieved from the far infrared spectral and lidar measurements performed on field during Winter 2018–2019 on the Zugspitze Mount (Germany) within the FIRMOS project, founded by the European Space Agency (ESA).