2023-10-182024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/653313北半球西風帶控制著歐洲和地中海地區的水文氣候變化，影響著農業、生物經濟和數百萬人。在過去的幾年中，高頻率的極端氣候事件對人類社會造成了毀滅性的影響。歐洲的大多數氣候災害與西風的變化有關，為了了解西風的動力來源以及過去的變化方式，需要來自冰期的古氣候記錄，因為在冰期的時候，北大西洋上的緯向溫度差距減小，西風的風速會因此增強。在這個計畫中中，我預期使用石筍及其地球化學特性來重建海洋同位素階段12（MIS 12，478-424千年前）期間的古氣候，這是過去一百萬年中最冷的冰期。我的研究地點將是對西風變異敏感的北義大利。我期望建立一個絕對確定的氣候記錄，並綜合在MIS 12期間發表的氣候記錄，以描述西風的行為，並進一步研究加劇的機制和過程。這個項目將有助於我們理解中緯度氣候，並有助於改善未來氣候變化的氣候預測。 The northern westerly winds control the hydroclimate changes over Europe and the Mediterranean region, affecting agricultures, bioeconomy and millions of people. In the past years, high-frequency extreme climate events have resulted in devasting impact on human society. Most of these climate disasters in Europe are related to the changes in the westerly winds. To understand the intensification of the westerly winds, paleo-records from glacial times are crucially needed, as the decreasing latitudinal temperature contrast over the North Atlantic has strongly intensified the baroclinicity, which promotes the strength of the westerly winds. In this proposal, I intend to use speleothems and their geochemistry characteristics to reconstruct the paleoclimate during Marine Isotope Stage 12 (MIS 12), 478-424 thousand years ago, which is the coldest glacial time over the past one million years. Northern Italy will be my study site, where is sensitive to the westerly variability. I expect to build an absolutely dated climate record and synthesize the published climate records during MIS 12, to depict the behavior of the westerly and further investigate the mechanisms and process of intensification. This project will benefit our understanding of the mid-latitude climate and help improve the climate projection for future climate changes.西風帶;石筍;氣候變遷;氧同位素第12階;古氣候;westerly winds; stalagmite; climate change; paleoclimatology; marine isotope stage 12