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Reconstruction of the past westerly jet path and detection of the effects of global warming using sediments from both hemispheres

Research Project

Project/Area Number 18H03370
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

Nagashima Kana  国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 副主任研究員 (90426289)

Co-Investigator(Kenkyū-buntansha) 勝田 長貴  岐阜大学, 教育学部, 准教授 (70377985)
長谷川 精  高知大学, 教育研究部自然科学系理工学部門, 講師 (80551605)
落合 伸也  金沢大学, 環日本海域環境研究センター, 助教 (10401936)
村山 雅史  高知大学, 教育研究部総合科学系複合領域科学部門, 教授 (50261350)
岩崎 晋弥  国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 特別研究員(PD) (70751006)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywords偏西風 / 地球温暖化 / 黄砂 / 堆積物 / 気候変動
Outline of Final Research Achievements

To examine the westerlies changes before and after the onset of global warming and to assess background variability, we reconstructed past westerlies changes of both hemispheres during the last ca. eight hundred years using marine sediment cores obtained from the upper continental slope of southern Chile and lake sediment cores derived from Lake Suigetsu and Onuma, Japan. The deposition flux of Asian dust in Lake Suigetsu sediments suggests a relatively stable westerly jet path after the onset of global warming. In contrast, detrital material fluxes and provenance of marine sediments derived from the continental slope of southern Chile suggest a poleward shift of the southern westerlies since the late 1800s, especially during the late 1900s.

Academic Significance and Societal Importance of the Research Achievements

偏西風経路は中緯度域の気候に大きな影響を与え、東アジア~日本においては、梅雨の緯度分布や台風経路などの主な支配要因となっている。本研究では、数値モデルから予測されている、地球温暖化に伴う両極偏西風の極側へのシフトを検証するため、南北両半球の堆積物試料を用いた過去数百年の偏西風経路復元を行った。その結果、南半球の偏西風経路は、主に1800年代後半から現在に至る気温上昇に伴い、極側へシフトしたことが示唆された。一方、北半球偏西風の復元結果からは、顕著な経路変動の傾向は示されなかった。

Report

(4 results)
  • 2021 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (12 results)

All 2022 2021 2020 2019

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Journal Article] Aleutian Low variability for the last 7500 years and its relation to the Westerly Jet2021

    • Author(s)
      Nagashima Kana、Addison Jason、Irino Tomohisa、Omori Takayuki、Yoshimura Kei、Harada Naomi
    • Journal Title

      Quaternary Research

      Volume: ー Pages: 1-19

    • DOI

      10.1017/qua.2020.116

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sedimentary rhythm of Mn-carbonate laminae induced by East Asian summer monsoon variability and human activity in Lake Ohnuma, southwest Hokkaido, northern Japan2020

    • Author(s)
      Katsuta Nagayoshi、Naito Sayuri、Ikeda Hisashi、Tanaka Kuniaki、Murakami Takuma、Ochiai Shinya、Miyata Yoshiki、Shimizu Mayuko、Hayano Asuka、Fukui Konami、Hasegawa Hitoshi、Nagao Seiya、Nakagawa Mayuko、Nagashima Kana、Niwa Masakazu、Murayama Masafumi、Kagawa Masako、Kawakami Shin-ichi
    • Journal Title

      Quaternary Science Reviews

      Volume: 248 Pages: 106576-106576

    • DOI

      10.1016/j.quascirev.2020.106576

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 南半球偏西風の過去1000年に渡る経路変動2022

    • Author(s)
      長島佳菜, 長谷川精, 勝田長貴, 落合 伸也, Lamy Frank, Arz Helge, 粕谷拓人, 村山雅史, 原田尚美
    • Organizer
      JpGU2022
    • Related Report
      2020 Annual Research Report
  • [Presentation] Holocene Westerly Jet Variability Over East Asia and Its Linkages with the Aleutian Low and the East Asian Summer Monsoon2021

    • Author(s)
      Kana Nagashima, Ryuji Tada, Shin Toyoda, Jason Addison, Naomi Harada, Tomohisa Irino
    • Organizer
      AGU2021 fall meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mid- to late Holocene variability of the Aleutian Low Atmospheric Pressure Cell: Forcing by the Western Jet2021

    • Author(s)
      Kana Nagashima, Jason Addison, Tomohisa Irino, Takayuki Omori, Kei Yoshimura, Naomi Harada
    • Organizer
      JpGU2021
    • Related Report
      2020 Annual Research Report
  • [Presentation] Reconstruction of variations in South Pacific westerly jet path during the last glacial and calibration for the water content influence of ITRAX intensity2021

    • Author(s)
      Hitoshi Hasegawa, Fuyu Nagaya, Kana Nagashima, Nagayoshi Katsuta, Masafumi Murayama, Naomi Harada
    • Organizer
      JpGU2021
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] チリ沖コアを用いたItraxデータの含水率補正と最終氷期の南半球偏西風経路の復元2021

    • Author(s)
      長谷川精,長屋芙結,長島佳菜,勝田長貴,村山雅史,原田尚美
    • Organizer
      高知大学海洋コア総合研究センター共同利用・共同研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Reconstruction of variations in South Pacific westerly jet path during the last glacial2020

    • Author(s)
      Hitoshi Hasegawa, Fuyu Nagaya, Kana Nagashima, Nagayoshi Katsuta, Masafumi Murayama, Naomi Harada
    • Organizer
      JpGU2020
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 完新世のアリューシャン低気圧変動およびアジア上空偏西風ジェットとの関係2020

    • Author(s)
      長島佳菜, Jason Addison, 入野智久, 大森貴之, 芳村圭, 原田尚美
    • Organizer
      日本地球化学会第67回オンライン年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] チリ沖コアから復元する最終氷期における南半球の偏西風経路変動2020

    • Author(s)
      長屋芙結,長谷川精,長島佳菜
    • Organizer
      日本地質学会四国支部2020年愛媛大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Variability of the Aleutian Low and Westerly Jet during the Holocene2019

    • Author(s)
      Kana Nagashima, Naomi Harada
    • Organizer
      20th Congress of the International Union for Quaternary Research (INQUA)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 完新世におけるアリューシャン低気圧-偏西風ジェットの百年・千年規模変動2019

    • Author(s)
      長島 佳菜、原田 尚美
    • Organizer
      JpGU2019
    • Related Report
      2019 Annual Research Report

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Published: 2018-04-23   Modified: 2023-01-30  

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