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Fine scale mapping of daily temperatures in croplands by developing accumulated heat transfer model

Research Project

Project/Area Number 20K22605
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0604:Agricultural economics and rural sociology, agricultural engineering, and related fields
Research InstitutionNational Agriculture and Food Research Organization

Principal Investigator

Kimura Kensuke  国立研究開発法人農業・食品産業技術総合研究機構, 農業環境研究部門, 研究員 (10885502)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords最低気温 / 累積流量 / 局所気象 / モデル / 放射冷却 / 最高気温 / 微気象 / 熱輸送 / 熱移流 / 冷気流 / 最高・最低気温 / 数理モデル
Outline of Research at the Start

数m~数km四方単位のメッシュデータ群(気象,地形,地表面反射率等)を利用して,農地における局所的な最高気温および最低気温を精度良く評価可能なモデル(累積熱輸送モデル)を新たに構築する.次に,構築したモデルの最適化および妥当性検証のために,平地および中山間地の農地群において気温の多点計測を行う.本モデルは,作物の高温・低温障害の予測だけでなく,作目や作期の決定といった栽培管理にも応用可能と考えられる.

Outline of Final Research Achievements

Minimum temperature in complex terrains varies at fine spatial scales owing to cold air drainage, leading to large spatial variability of phenological events and frost risk of plants. Here, we improve a conventional model using flow accumulation. First, a new algorithm of the flow accumulation was proposed by reconsidering effective areas of cold air drainage. Second, radiative cooling scale representing temperature inversion strength was combined with the model, to facilitate minimum temperature estimation at a given date and site. The proposed model successfully estimated spatiotemporal variability of daily minimum temperature in a complex agricultural area, relative to the estimation using spatial interpolation alone: the average residuals between estimated and measured temperatures in valley areas were improved from -1.9 °C to -0.1 °C.Our approach could contribute to spatiotemporal analysis of temperature variations and concomitant changes in phenological events and frost risk.

Academic Significance and Societal Importance of the Research Achievements

近年広く普及しているメッシュ気象データは,気象観測点の実測値を統計的に空間補間しているため,どの地域においてもある程度の精度が保証され,非常に実用的である.しかし,統計的手法のみでは,農地の詳細な熱輸送プロセスを反映できないため,熱移流や冷気流の影響は考慮できない.本研究の学術的独自性は,これまで蓄積されてきた熱輸送プロセスの知見を考慮しつつ,回帰などの統計的手法も組み込んだ,合理的かつ実用的なモデルを構築した点にある.また,本モデルは,作物の高温・低温障害の予測だけでなく,作目や作期の決定といった栽培管理にも応用可能という点で社会的意義も有している.

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (3 results)

All 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] Spatiotemporal distribution of the potential risk of frost damage in tea fields from 1981-2020: A modeling approach considering phenology and meteorology2021

    • Author(s)
      KIMURA Kensuke、KUDO Ken、MARUYAMA Atsushi
    • Journal Title

      Journal of Agricultural Meteorology

      Volume: 77 Issue: 4 Pages: 224-234

    • DOI

      10.2480/agrmet.D-21-00011

    • NAID

      130008102798

    • ISSN
      0021-8588, 1881-0136
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 複雑地形における日最低気温の時空間分布の評価:累積流量モデルの改良2022

    • Author(s)
      木村建介,丸山篤志,佐々木華織,工藤健,中川博視
    • Organizer
      日本農業気象学会2022年全国大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 気象と生物季節を考慮した凍霜害リスクの時空間分布:過去40年のチャ園における評価2021

    • Author(s)
      木村建介,工藤健,丸山篤志
    • Organizer
      日本農業気象学会2021年全国大会
    • Related Report
      2020 Research-status Report

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Published: 2020-09-29   Modified: 2023-01-30  

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