Paleotyphoon and Environmental Changes Inferred from Kitaura Lake Sediments

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Project title

Code/計畫編號

MOST107-2116-M019-001

Translated Name/計畫中文名

日本Kitaura Lake岩心之古颱風與環境變遷研究

Project Coordinator/計畫主持人

Huei-Fen Chen

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=12676855

Year

2018

Start date/計畫起

01-08-2018

Expected Completion/計畫迄

01-07-2019

Bugetid/研究經費

1761千元

ResearchField/研究領域

地球科學

亞洲夏季季消退之後(4ka)熱帶氣旋在西北太平洋和大西洋西部發生的頻率更加頻繁且強度更加明顯。大西洋西部地區已有許多臨海的潟湖岩芯資料顯示古颶風受ENSO震盪與ITCZ南北移動之影響。對照西北太平洋和大西洋西部熱帶氣旋研究的成果似乎表明兩者之間有同樣的趨勢。結合過去中國歷史文獻紀錄統計發現颱風在近2000年以來明顯反應ENSO和ITCZ的影響，但歷史資料在某些朝代是有資料缺失的，因此須有岩芯資料才能獲得連續性的變化，並準確判斷颱風強弱。目前確認登陸日本和韓國的颱風在El Nino-like較為頻繁且強度較強，登陸在台灣和廣東地區的颱風則好發於La Nina-like時間段，南北方有著時間上的間隔。颱風在西北太平洋行經的範圍較為廣泛，許多地方尚缺乏古颱風研究之岩芯紀錄。本計畫將以日本東部靠近東京地區之Kitaura Lake潟湖為研究對象，未來若能預測長時間尺度的颱風影響將有助於東京的防災工作。預計鑽取數個沉積物岩芯進行定年、磁感率、粒徑大小、礦物組成、化學成分等參數的分析，尋求沉積物中指示颱風強度的物理或化學指標。重建西北太平洋地區古颱風路徑與強度變化，並進一步比對大西洋西岸和西北太平洋熱帶氣旋的路徑與強度是否同步演變。 Tropic cyclones (TC) landfall in Northwestern Pacific and Western Atlantic Ocean are more frequency and intensified after retreat of Asian Summer Monsoon since 4ka. Many lagoon sediment cores in Western Atlantic Ocean revealed that the tracks of paleohurricane are controlled by El Nino-Southern Oscillation (ENSO) and the shift of ITCZ. Correlating to the TC results from Northwestern Pacific and Western Atlantic Ocean seem to reveal the same trend. Combing our paleotyphoon records of Chinese Historical documents, we discovered that paleotyphoon reflects the influence of ENSO and ITCZ. However, the data lose in some Dynasties. We need sediment cores to get continuous variation and help us to judge the intensity of typhoons. More frequent and intensified TCs landfall on Japan and Korea occurred during El Nino-like period, while they happened in Taiwan and Gungdong during La Nina-like period. The result show a different time interval between the north and south regions. The tracks of paleotyphoons in Northwestern Pacific over a wide range, but many localities lacks core records of paleotyphoon. We are going to core lagoon sediments in Kitaura Lake near the east of Tokyo for forecasting the frequency and intensity of typhoons in long term period. In this study, we need get several sediment cores to do the analyses of age dating, magnetic susceptibility, grain size, mineral and chemical compositions. Finally, we will construct the tracks and intensity of paleotyphoons in Northwestern Pacific regions, and then correlate with the TC in Western Atlantic Ocean.

Keyword(s)

西北太平洋
颱風
路徑
湖泊
指標
Northwestern Pacific
typhoon
track
lake
index

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Paleotyphoon and Environmental Changes Inferred from Kitaura Lake Sediments

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