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1988 Fiscal Year Final Research Report Summary

Estimation of liquid water content and water vapor amount in the polar region

Research Project

Project/Area Number 61540304
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionNational Institute of Polar Research

Principal Investigator

KAWAGUCHI Sadao  National Institute of Polar Research, Chief Research Officer, Professor, 教授 (40000153)

Co-Investigator(Kenkyū-buntansha) KANZAWA Hiroshi  National Institute of Polar Research, Division of data collection and processing, 資料系, 助手 (20150047)
AOKI Shuji  National Institute of Polar Research, Division of Research, Research Associate., 研究系, 助手 (00183129)
WADA Makoto  National Institute of Polar Research, Division of Research, Research Associate., 研究系, 助手 (40132716)
FUJII Yoshiyuki  National Institute of Polar Research, Division of Research, Associate Professor., 研究系, 助教授 (20125214)
YAMANOUCHI Takashi  National Institute of Polar Research, Division of Research, Associate Professor., 研究系, 助教授 (00141995)
Project Period (FY) 1986 – 1988
KeywordsAntarctic Climate Research / Liquid water content / Water vapor amount / Microwave radiometer / Satellite / AVHRR imagery / Discrimination of clouds / TOVS.
Research Abstract

Clouds and water vapor work as an important factors of the climate in the Antarctic. This study aimes to obtain the method to derive liquid water content of clouds and water vapor amounts from groundbased microwave observations and satellite data.
1. As for the microwave observation, radiometers of three frequency range, 12, 19 and 37 GHz were examined. From the preliminary observation in Japan, combination of rediometers of three frequency regions works effective to get the cloud information. However, in the polar region, because of small amount of liquid water and water vapor, 12 GHz radiometer was not suitable and 19 GHz radiometer, which was expected to be effective for water vapor measurements, did not offer a meaning value of water vapor. It was shown that the single frequency measurements by the 37 GHz radiometer was enough to derive liquid water content under the polar atmosphere where the amount of water vapor and liquid water are small, if the physical temperature of antenna was monitored.
2. The method to discriminate clouds by AVHRR data of NOAA satellite was examined. Since the cloud cover over the snow surface in the polar region is difficult to detect only by the visible reflection or infrared brightness temperature, the differences of infrared brightness temperatures were used. The differences between the brightness temperature in 4 mum region (ch 3) and 10 mum region (ch 4), 10 mum and 12 mum region (ch 5) were used together with the 2 dimentional histogram of the brightness temperature and the difference.
3. Atmospheric water vapor amount was derived from the TIROS Operational Veritcal Sounder (TOVS) of NOAA satellite. Since the strong surface inversion affects the analysis, iteration method with considering the surface temperature explicitly was used. Comparing to the aerological data, though the vertical profile shows large disagreements, the column amounts of water vapor agreed within small variations.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Wada,Makoto: J.Meteor.Soc.Jpn. 65. 483-495 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamanouchi,Takashi: J.Meteor.Soc.Jpn. 65. 949-962 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimizu,Masanobu: Antarctic Record. 33. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wada, Makoto: "Formation mechanisms of clouds during high-pressure conditions in the coastal region of Antarctica." J. Meteor. Soc. Jpn. 65. 483-495 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamanouchi, Takashi: "Detection of clouds in Antarctica from infrared multispectral data of AVHRR." J. Meteor. Soc. Jpn. 65. 949-962 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shimizu, Masanobu: "Precipitable water amount in the Antarctic atmosphere from TOVS of NOAA satellite." Antarctic Record. 33. (1989)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1990-03-20  

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