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Development of a cloud particle sensor for radiosonde sounding

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Title: Development of a cloud particle sensor for radiosonde sounding
Authors: Fujiwara, Masatomo Browse this author →KAKEN DB
Sugidachi, Takuji Browse this author
Arai, Toru Browse this author
Shimizu, Kensaku Browse this author
Hayashi, Mayumi Browse this author
Noma, Yasuhisa Browse this author
Kawagita, Hideaki Browse this author
Sagara, Kazuo Browse this author
Nakagawa, Taro Browse this author
Okumura, Satoshi Browse this author
Inai, Yoichi Browse this author
Shibata, Takashi Browse this author →KAKEN DB
Iwasaki, Suginori Browse this author
Shimizu, Atsushi Browse this author
Issue Date: 24-Mar-2016
Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
European Geosciences Union(EGU)
Journal Title: Atmospheric Measurement Techniques
Volume: 9
Issue: 12
Start Page: 5911
End Page: 5931
Publisher DOI: 10.5194/amt-9-5911-2016
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.
Rights: © Author(s) 2016. CC Attribution 3.0 License.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤原 正智

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