Preprints
https://doi.org/10.5194/amt-2020-476
https://doi.org/10.5194/amt-2020-476

  08 Jan 2021

08 Jan 2021

Review status: a revised version of this preprint is currently under review for the journal AMT.

Advanced method for estimating the number concentration of cloud water and liquid water content observed by cloud particle sensor sondes

Jun Inoue1,2, Kazutoshi Sato3, Yutaka Tobo1,2, Fumikazu Taketani4, and Marion Maturilli5 Jun Inoue et al.
  • 1National Institute of Polar Research, Tachikawa, 190-8518, Tokyo, Japan
  • 2The Graduate University for Advanced Studies, SOKENDAI, Tachikawa, 190-8518, Tokyo, Japan
  • 3Kitami Institute of Technology, Kitami, 090-8507, Hokkaido, Japan
  • 4Japan Agency of Marine-Earth Science and Technology, Yokohama, 236-0001, Kanagawa, Japan
  • 5Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, 14473, Germany

Abstract. A cloud particle sensor (CPS) sonde is an observing system attached with a radiosonde sensor to observe the vertical structure of cloud properties. The signals obtained from CPS sondes are related to the phase, size, and number of cloud particles. The system offers economic advantages including human resource and simple operation costs compared with aircraft measurements and land-/satellite-based remote sensing. However, because CPS systems are limited for data downlink to land stations, the observed information should be appropriately corrected. We launched approximately 40 CPS sondes in the Arctic region between 2018 and 2020 and use these data sets to develop correction methods that exclude unreliable data, estimate the effective cloud water droplet radius, and determine a correction factor for the total cloud particle count. We apply this method to data obtained in October 2019 over the Arctic Ocean and March 2020 at Ny-Alesund, Svalbard, Norway to compare with a particle counter onboard a tethered balloon and liquid water content retrieved by a microwave radiometer. The estimated total particle count and liquid water content from the CPS sondes generally agree with those data, which exemplifies the promising advantages of this approach to retrieve quantitative and meaningful information on the vertical distribution of cloud microphysics.

Jun Inoue et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Reviewer 1', Anonymous Referee #1, 31 Jan 2021
    • AC1: 'Reply on RC1', Jun Inoue, 02 Apr 2021
  • RC2: 'Comment on amt-2020-476', Anonymous Referee #2, 11 Feb 2021
    • AC2: 'Reply on RC2', Jun Inoue, 02 Apr 2021
  • RC3: 'Comment on amt-2020-476', Anonymous Referee #3, 11 Feb 2021
    • AC3: 'Reply on RC3', Jun Inoue, 02 Apr 2021

Jun Inoue et al.

Jun Inoue et al.

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Short summary
A cloud particle sensor (CPS) sonde is an observing system to obtain the signals of the phase, size, and the number of cloud particles. Based on the field experiments in the Arctic regions and numerical experiments, we proposed a method to correct the CPS sonde data and found that the CPS sonde system can appropriately observe the liquid cloud if our correction method is applied.