2017 Fiscal Year Research-status Report
| Project/Area Number |
15K17782
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| Research Institution | The University of Tokyo |
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Principal Investigator |
松崎 賢史 東京大学, 大学院理学系研究科(理学部), 特別研究員 (50728582)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Keywords | Radiolarian / semi-quantitative proxy / Paleoceanography / Kuroshio Current / Intermediate water |
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| Outline of Annual Research Achievements |
This project aim to establish radiolarian fossils as a suitable semi-quantitative proxy in area influenced by the Kuroshio Current. During the first 2 years of this project we clarified the spatial distribution of radiolarian species and also their affinities with change in sea surface and intermediate water temperatures. The last step of this project is to apply the obtained knowledge on a sediment core and estimate the sea surface and intermediate water temperature of the past. Thus we analyzed 120 sediment core samples collected in the East China Sea (ECS) and the studied core cover the last 400,000 years.
During this year I have estimated the sea surface and intermediate water temperature of the past 400,000 years of the northern ECS. My main effort was to write the paper for conclude this research project. The paper is submitted and is under review (Matsuzaki et al., submitted). Below I have highlighted our major finding:
With the help of my co-workers, we demonstrated that the sea surface temperature (SST) of the past 400,000 years estimated by radiolarian species were sensible to the glacis-eustatic sea-level changes of the Pleistocene, which are paced by the eccentricity cycle. During high sea level, the Kuroshio Current has a sustained influenced in the northern ECS and thus the SST were warmer, while during low sea level the path of the KC do not influenced the northern ECS causing colder SST. We also suggested that the bottom water were less oxygenated since 170,000 years ago and this may be related to changes in the intensity of the East Asian Summer Monsoon.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The objective of the last fiscal year was to write and publish a paper where we reconstruct the pale oceanography of an area influenced by the Kuroshio Current using the knowledge obtained from previous fiscal years achievements. This objective is cleared as I wrote and have submitted a paper where the paleoceanograpghy of the last 400,000 years were reconstructed based on our previous year research achievements (e.g. Sea Surface Temperate estimates, Intermediate Water temperature estimates, bottom water ecological properties estimates...). The unique problem is that the paper is still under review but we believe that this will be cleared in a couple of month.
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| Strategy for Future Research Activity |
The research project is completed. We have asked an extension of fees (<200,000 Yen) for the next year just for be able to pay the open-access fee of the paper which is now under review and pay the fees for present the new paper and its results at the congress of the Geological Society of Japan Congress in September.
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| Causes of Carryover |
I had estimated 200,000 Yen for attend the Paleontological Society of Japan in Ehime University and pay the open-access fee of the summary paper of this project. I could not attend the Paleontological Society of Japan in Ehime University because I was busy with other research project and the paper submitted is still not accepted and thus I can not pay the open-access fee.
Therefore, I plan to use the 200,000 Yen during next fiscal year by paying the open-access fee of the submitted paper and paying the congress of the geological Society of Japan for present the highlight of the paper, which is now under review.
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Research Products
(4 results)
