Probing the Proxy of Winnter Monsoon in East Asia

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Project title

Code/計畫編號

NSC99-2116-M019-002

Translated Name/計畫中文名

東亞地區冬季季風指標之探討

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=2149223

Year

2010

Start date/計畫起

01-08-2010

Expected Completion/計畫迄

01-07-2011

Bugetid/研究經費

1389千元

ResearchField/研究領域

地球科學
大氣科學

"目前古氣候研究使用之夏季季風指標如生物指標、TOC 和氧同位素等已廣被接受，並且應用於湖泊岩心和海洋岩心。冬季季風指標目前較適宜者，包括使用粒徑分析、礦物來源指標之探討，甚至包括近幾年部分學者使用化學元素Ti 做為判斷湖泊沉積物之風成來源。然而粒徑分析之方法僅適用於黃土高原之風成沉積環境，對於湖泊和海洋等環境並不適用，因此大多數湖泊和海洋岩心的研究仍需使用黏土礦物來源做為判斷指標，但這些地區性的地質背景調查資料相對需花費更多時間進行研究了解，因而化學元素Ti 成為目前研究學者認為的另一項探索指標。依據目前本人研究中國內蒙區域、台灣湖泊岩心，乃至沖繩海槽岩心的結果，並不認為Ti 元素可做為風成來源用以判斷冬季季風的指標，我們應以科學的方法澄清這個問題。因此本研究計畫綜合中國地區北方湖泊岩心、台灣地區的湖泊和海洋岩心的礦物與化學資料，探討Ti 是否能指示風成來源，或僅能指示沉積區之岩屑來源，抑或為化學風化過程的殘餘物。此外，本研究欲進行三年期的研究計畫，普遍調查中國北方湖泊沉積物的礦物定量和化學元素分布，並比較台灣地區湖泊沉積物的差異。此後為了解母岩影響和風化作用影響對於沉積礦物與化學性質的改變，嘗試使用實驗岩石學的方法，以各種岩石進行開放系統下的酸溶與鹼溶的試驗，用以模擬酸性、鹼性沉積環境之土壤、湖泊、海洋等，以了解各主要元素的溶解和遷移過程。並釐清Ti 是否應在物理風化過程被保留於風成沉積物中，或應被保留於化學風化過程的最終產物。" "The proxies of summer monsoon including bio-index, TOC, δ18O and so on had been recently confirmed and applied in lacustrine and oceanic cores. The suitable proxies of winter monsoon include grain-size analyses, sources of terrestrial minerals, and the chemical element Ti for judging the eolian source in the lacustrine sediments. Although the method of grain-size analysis is only suitable for the eolian sedimentary environment in Löess Plateau, it is invalid in lake and ocean environments. Hence, most researches related to lake and ocean cores use the proxy of clay minerals to judge the terrestrial sources. The background of regional geology still needs more investigations and time to understand. Some researchers think the chemical element Ti is to be another exploration index. However, we don’t think the element Ti can be the proxy of eolian source to judge the winter monsoon according to our research results in the areas of Inner Mongolia, Taiwan lakes, and Okinawa Trough. Therefore, this project will combine the mineral with chemical data from the lake and marine cores in North China and Taiwan to discuss the origin of Ti. We will estimate if Ti can indicate the eolian source, the detrital source, or the residual after chemical weathering processes. This project also costs three years to investigate distribution map of mineral and chemical quantifications in lakes of North China, and it will compares the lacustrine sediments in Taiwan with North China. We will use method of experimental petrology to understand the influences of protolith, and the changes of minerals and chemical compositions after weathering. We take several rocks to dissolve in acid and alkaline solutions, and try to simulate acid and alkaline environments, such as soils, lakes, marine and so on. We expect to evaluate the processes of elemental dissolution and migration. Finally, we will clarify that Ti would be reserved in the eolian sediments by physical weathering, or the residual element by chemical weathering."

Keyword(s)

Ti/Al比值
冬季季風
東亞
風成砂
搬運
Ti/Al ratio
winter monsoon
East Asia
aeolian
transport

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Probing the Proxy of Winnter Monsoon in East Asia

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