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Development of a new method of GNSS water vapor tomography

Research Project

Project/Area Number 20K12156
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

FUJITA Mikiko  国立研究開発法人海洋研究開発機構, 地球環境部門(大気海洋相互作用研究センター), グループリーダー (50426293)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2021: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords水蒸気トモグラフィー / GNSS気象 / 大気構造 / シグネチャ / トモグラフィー解析 / トモグラフィー 解析 / リモートセンシング / GNSS
Outline of Research at the Start

本研究では、GNSS衛星の視線方向の大気遅延量を使った新たな水蒸気トモグラフィー手法を開発する。複数または単一観測点で連続した水蒸気鉛直プロファイルが解析可能な手法を開発し、他の水蒸気鉛直プロファイル観測データとの比較検証を行う。得られたプロファイルを元に上空の水蒸気量の鉛直構造の変化を調査する。極端降水の原因とされる上空の水蒸気変動を効率的かつ高時間分解能の観測を目指す。

Outline of Final Research Achievements

In this study, we developed a new water vapor tomography method using GNSS satellites (Global Navigation Satellite System), which enables continuous observation of water vapor. We made improvements to allow analysis with relatively fewer GNSS observation points compared to conventional GNSS water vapor tomography methods. GNSS water vapor tomography analysis involves solving a system of simultaneous equations that represent the inverse problem of the radio wave path and the travel time (delay caused by water vapor). We primarily focused on improving the boundary conditions (weighting function) used in the inverse analysis. The simple weighting functions frequently used in previous studies tend to exhibit significant bias at specific altitudes. However, the weighting model developed in this study achieved higher accuracy in estimation.

Academic Significance and Societal Importance of the Research Achievements

本研究では、水蒸気の連続観測を可能とするGNSS衛星(衛星測位システム)を用いた、新たな水蒸気トモグラフィー手法の開発を実施した。開発したトモグラフィー手法では、より高精度に水蒸気の鉛直構造を推定することが可能となった。これにより、これまで観測することが難しかった降水イベント発生時の大気構造を、連続的かつ高頻度に観測・監視することができるようになり、降水現象の詳細理解や予測精度の向上へつながる可能性がある。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2024 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Prediction of Atmospheric Profiles With Machine Learning Using the Signature Method2024

    • Author(s)
      Fujita M.、Sugiura N.、Kouketsu S.
    • Journal Title

      Geophysical Research Letters

      Volume: 51 Issue: 6

    • DOI

      10.1029/2023gl106403

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Atmospheric Convection Research Using Autonomous Surface Vehicles2023

    • Author(s)
      Yoneyama Kunio、Yokoi Satoru、Fujita Mikiko、Seiki Ayako、Katsumata Masaki、Geng Biao、Fukuda Tatsuya
    • Journal Title

      MAUSAM

      Volume: 74 Issue: 2 Pages: 287-296

    • DOI

      10.54302/mausam.v74i2.5904

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Monitoring for the extreme water vapor variation around Japan using GNSS2024

    • Author(s)
      Mikiko Fujita
    • Organizer
      ICG International Committee on GNSS: WG-D and WG-B's Task Force on Applications of GNSS for Disaster Risk Reduction
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Sensitivity of water vapor vertical shape in GNSS atmospheric observation2023

    • Author(s)
      Mikiko Fujita
    • Organizer
      EGU General Assembly 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 民間独自基準点データを用いた2021年8月九州地方大雨のGNSS可降水量と鉛直構造推定2023

    • Author(s)
      藤田実季子
    • Organizer
      日本気象学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] GNSSを用いた船舶等による水蒸気量観測2022

    • Author(s)
      藤田実季子
    • Organizer
      電子情報通信学会 2022年ソサイエティ大会企画講演
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] GNSSの気象利用の概要と将来について2022

    • Author(s)
      藤田実季子
    • Organizer
      準天頂衛星が拓く安全・安心社会の実現に向けた高精度測位技術及び応用に関するシンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] GNSS水蒸気トモグラフィー解析手法の検討2022

    • Author(s)
      藤田実季子
    • Organizer
      日本気象学会2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] A Field-based Attempt to Study a Relationship Between Convective Activity and Ocean Surface Condition in Mesoscale Viewpoint2022

    • Author(s)
      Kunio YONEYAMA, Satoru YOKOI, Mikiko FUJITA, Ayako SEIKI, Masaki KATSUMATA, Biao GENG, Tatsuya FUKUDA
    • Organizer
      American Meteorological Society, 35th Conference on Hurricanes and Tropical Meteorology
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2025-01-30  

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