2017-07-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681895摘要：地質時間尺度的氣候、海洋成分的演化，除了受控於生物與火山作用之外，化學風化與物理侵蝕作用亦扮演了一個關鍵的角色。在眾多可用於探討這兩個作用的可能材料與地點中，台灣獨特的地質條件，孕育眾多高聳的山脈與陡峭的河流系統，更因頻繁的地震與構造變形，造成破碎的地表狀況，配合高頻率的颱風事件，台灣小河系統的風化與侵蝕速度，甚至大於許多大河系統，對於全球尺度的收支變化扮演重要的角色。為了解析造成這樣驚人風化與侵蝕速度的控制變因，本研究計畫採取台灣東部的河水與河系底流沈積物、土壤與岩石，分析其地球化學特徵，並與氣象參數以及透過其他子計畫利用地震訊號或影像所獲得的侵蝕量進行比較與關聯分析，進而探討小型河流系統的風化作用與沉積物傳輸的模式，並推論對其對於全球系統或地質時間尺度產生的影響力。<br> Abstract: Despite of biological respiration/primary production, and volcanic emission, chemical weathering and physical erosion play a critical role in controlling the evolution of atmospheric and marine compositions over geological time scale. Of the possible materials and sites for studying such processes, Taiwan is unique in a way that its geological setting has enabled the formation of high mountains and steep river systems. With frequent typhoon invasion and fragmentary surface conditions generated by earthquakes and intense tectonic deformation, the weathering and erosion rates in small river systems of Taiwan are even greater than those in several major large river systems around the world, contributing significantly under the global context. To investigate the controlling factors for such tremendous weathering and erosion rates, the proposed research aims to collect river water, bedload sediments, soils and rocks from the watersheds in eastern Taiwan and analyze their geochemical characteristics. These results will be correlated with meteorological parameters, and quantities of eroded materials using seismic and imaging analyses to derive the mechanistic model accounting for weathering and sediment transport in small river systems. The model will be further scaled up to address the impacts of small river systems on the global budget at geological time scales.極端事件化學風化物理侵蝕extreme eventchemical weatheringphysical erosion