Images II: Mud Drift Paleoceanography in Western Pacific Marginal Seas

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Project title

Code/計畫編號

NSC102-2611-M019-005

Translated Name/計畫中文名

IMAGES II: 西太平洋邊緣海泥堆沉積之古海洋研究

Project Coordinator/計畫主持人

Min-Te 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=3095704

Year

2013

Start date/計畫起

01-08-2013

Expected Completion/計畫迄

01-07-2014

Bugetid/研究經費

1687千元

ResearchField/研究領域

海洋科學

"IPCC ar4已明確指出本世紀由於人為活動影響，全球氣候型態將出現重大改變並將對地球環境產生衝擊。由於儀器觀測資料的缺乏，台灣鄰近區域的高解析度長期氣候記錄尚付之闕如。本計畫將分年以西太平洋邊緣海之泥質沉積物漂堆所採集之岩心為材料，規畫分析這些岩心標本的海水表面溫度代用指標：烯酮類不飽和度、及新發展中的有機生物指標 TEX86等，與指示陸源物質通量的長碳鏈正烷類等，以重建台灣鄰近海域海水表面溫鹽度與降雨量自最後一次冰期以來的變化。本年度將以閩江口泥質漂堆為研究重點，比較本區的古氣候記錄與冰心與北大西洋海洋岩心所顯示的近一萬年以來之千年至百年時間尺度的週期或事件。台灣鄰近海域氣候在這時間尺度上是如何反應或與高緯氣候變化交互影響仍是目前古氣候學需解決的問題。本計畫亦將進行國內古海洋與古氣候同仁的 IMAGES II整合規畫，以東亞與西太平洋海陸古氣候連比、最近 2000年的台灣及其鄰近區域古氣候研究為重點，並善用與測試國研院海洋中心正建造的新船 20公尺活塞岩心採樣器，與透過國際與兩岸合作使用國外研究船在台灣鄰近海域探取高沉積速率岩心。本計畫所重建高解析度多元海水表面溫度記錄，將幫助了解自晚全新世以來的氣候逐漸變溼冷的趨勢是否與間熱帶輻合帶遷移與東亞季風變化機制有關，並從而能了解長期自然氣候變化的規律及可能對人類社會的潛在衝擊。" "IPCC ar4 reports that before the end of this century, the human society will face significant environmental impacts brought by climate changes due to anthropogenic forcing. Due the limitation of short instrumental records, few high-resolution and long-term climate record has been available for assessing such impacts brought by anthropogenic or natural climate changes. To address the important issue of climate change and possible impact, this project is designed to conduct long-term paleoclimatic reconstructions based on marine cores retrieved from the mud drifts on the western Pacific marginal seas. This research plan of the 1st year aims to reconstruct high-resolution sea surface temperature (SST), salinity (SSS), and n-alkanes analyses using high-sedimentation rate marine cores of the Holocene from the sediment drift areas near Ming River Mouth. SST proxies will be estimated by the alkenones undersaturation index, and a novel proxy organic biomarker TEX86. The Ming-River mud drift SST and precipitation records will be compared to the Holocene climate variations shown in the ice cores and North Atlantic marine cores that are dominated by millennial to centennial-scale cycles or events. This study will provide data that address how the tropical western Pacific and East Asia have been interacted with such global climate changes over the time scales. The study plan initiates an integrated project IMAGES II (expectedly launched from 2013), focusing on land-sea climate linkages in the East Asia and Western Pacific, and a time scale of the past 2000 years in concordance with IPCC ar4. The new integrated projects emphasizes the better uses of the new piston coring system (~20m) equipped in the new RV OR5, and other international coring platforms by cooperation. The high-resolution SST, SSS, precipitation records reconstructed in this study will be used to identify any ITCZ or monsoon amplification mechanism for explaining late Holocene cool/wet climatic trends near Taiwan, which further our understanding on what lessons are to be learned from the paleoceanographic records about climate and ocean dynamics for the early 21st century, with potential impacts on humanity."

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Images II: Mud Drift Paleoceanography in Western Pacific Marginal Seas

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