Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

Journal metrics

  • IF value: 3.089 IF 3.089
  • IF 5-year<br/> value: 3.700 IF 5-year
    3.700
  • CiteScore<br/> value: 3.59 CiteScore
    3.59
  • SNIP value: 1.273 SNIP 1.273
  • SJR value: 2.026 SJR 2.026
  • IPP value: 3.082 IPP 3.082
  • h5-index value: 45 h5-index 45
Atmos. Meas. Tech., 9, 5911-5931, 2016
https://doi.org/10.5194/amt-9-5911-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
09 Dec 2016
Development of a cloud particle sensor for radiosonde sounding
Masatomo Fujiwara1,2, Takuji Sugidachi1,a, Toru Arai1,b, Kensaku Shimizu3, Mayumi Hayashi4, Yasuhisa Noma4, Hideaki Kawagita4, Kazuo Sagara4, Taro Nakagawa5, Satoshi Okumura5, Yoichi Inai2,c, Takashi Shibata6, Suginori Iwasaki7, and Atsushi Shimizu8 1Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan
2Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
3Meisei Electric Co., Ltd, Isesaki, 372-8585, Japan
4Shinyei Technology Co., Ltd, Kobe, 650-0047, Japan
5Shinyei Kaisha, Kobe, 651-0178, Japan
6Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan
7Department of Earth and Ocean Sciences, National Defense Academy, Yokosuka, 239-8686, Japan
8National Institute for Environmental Studies, Tsukuba, 305-8506, Japan
anow at: Meisei Electric Co., Ltd, Isesaki, 372-8585, Japan
bnow at: MTG Co., Ltd, Nagoya, 453-0041, Japan
cnow at: Graduate School of Science, Tohoku University, 980-8578, Japan
Abstract. A meteorological balloon-borne cloud sensor called the cloud particle sensor (CPS) has been developed. The CPS is equipped with a diode laser at  ∼  790 nm and two photodetectors, with a polarization plate in front of one of the detectors, to count the number of particles per second and to obtain the cloud-phase information (i.e. liquid, ice, or mixed). The lower detection limit for particle size was evaluated in laboratory experiments as  ∼  2 µm diameter for water droplets. For the current model the output voltage often saturates for water droplets with diameter equal to or greater than  ∼  80 µm. The upper limit of the directly measured particle number concentration is  ∼  2 cm−3 (2 × 103 L−1), which is determined by the volume of the detection area of the instrument. In a cloud layer with a number concentration higher than this value, particle signal overlap and multiple scattering of light occur within the detection area, resulting in a counting loss, though a partial correction may be possible using the particle signal width data. The CPS is currently interfaced with either a Meisei RS-06G radiosonde or a Meisei RS-11G radiosonde that measures vertical profiles of temperature, relative humidity, height, pressure, and horizontal winds. Twenty-five test flights have been made between 2012 and 2015 at midlatitude and tropical sites. In this paper, results from four flights are discussed in detail. A simultaneous flight of two CPSs with different instrumental configurations confirmed the robustness of the technique. At a midlatitude site, a profile containing, from low to high altitude, water clouds, mixed-phase clouds, and ice clouds was successfully obtained. In the tropics, vertically thick cloud layers in the middle to upper troposphere and vertically thin cirrus layers in the upper troposphere were successfully detected in two separate flights. The data quality is much better at night, dusk, and dawn than during the daytime because strong sunlight affects the measurements of scattered light.

Citation: Fujiwara, M., Sugidachi, T., Arai, T., Shimizu, K., Hayashi, M., Noma, Y., Kawagita, H., Sagara, K., Nakagawa, T., Okumura, S., Inai, Y., Shibata, T., Iwasaki, S., and Shimizu, A.: Development of a cloud particle sensor for radiosonde sounding, Atmos. Meas. Tech., 9, 5911-5931, https://doi.org/10.5194/amt-9-5911-2016, 2016.
Publications Copernicus
Download
Short summary
A meteorological balloon-borne cloud sensor called the cloud particle sensor (CPS) has been developed. The CPS can count the number of particles per second and can obtain the cloud phase information (i.e. liquid, ice, or mixed). Twenty-five test flights have been made between 2012 and 2015 at midlatitude and tropical sites. The results from the four flights are discussed.
A meteorological balloon-borne cloud sensor called the cloud particle sensor (CPS) has been...
Share