The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea
碩士 === 國立臺灣大學 === 海洋研究所 === 102 === Biogenic silica, as well as carbonaceous particles, are the most important types of biogenic sediments. For the South China Sea area where huge amount of terrigenous particles from small rivers of the surrounding islands and large rivers play a very important role...
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ndltd-TW-102NTU052790182016-03-09T04:24:05Z http://ndltd.ncl.edu.tw/handle/24487319147452205469 The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea 環境變遷對於南海東北部沉積物中生物矽含量時序變化之影響 Hsu-Pin Tsai 蔡旭濱 碩士 國立臺灣大學 海洋研究所 102 Biogenic silica, as well as carbonaceous particles, are the most important types of biogenic sediments. For the South China Sea area where huge amount of terrigenous particles from small rivers of the surrounding islands and large rivers play a very important role in transporting land derived materials to the ocean, however, the exact amount of terrigenous materials from land to the ocean may subject to climate change and varied in times. In addition, sea temperature fluctuation may also affect ocean productivity in the area. There is little study on the variation(s) of sediment deposition with respect to the temporal variation, in particular, and area subjecting to climatic changes. Biogenic sediments mainly compose of biogenic silica, organic carbon and calcium carbonate. Biogenic Silica (BSi) is the amorphous silicon content which is usually determined by wet chemical extraction. It is also known as or referred to as biogenic opal (Opal). Main sources of the biogenic silica in sediment come from diatoms, radiolarians, silicoflagellates and sponge spicules and other siliceous organisms, with their skeletons accumulated on the seabed. Biogenic silica content variation in sediments usually indicate a change(s) of oceanic paleoproductivity. Changes of paleoproductivity were closely related to the status of paleoseawater nutrient and the change of paleoclimatic condition. Hence, sedimentary record of biogenic silica could serve as an indicator of large scale changes of the ancient oceans or paleoclimatic (e.g. glacial or interglacial) change. The result of this study showed that biogenic silica content in sediments in the northeastern South China Sea at sampling site AG (ssAG; Latitude: 20.05° N, Longitude: 118.10° E) range between 3.68% and 9.20%, with an average of 5.64 ± 1.92%, and at site 2914 (ss2914; Latitude: 22.03° N, Longitude: 119.85 ° E) range between 1.63% and 6.40%, with an average of 3.57 ± 1.47%. From the perspective of spatial scales, ssAG is further away from Taiwan compare to ss2914. ssAG has much higher level of biological source of sediment. The amount of biogenic silica in both ssAG and ss2914 are relatively low for Holocene and high during the last glacial. In between, the amount of biogenic silica correlate very well with the amount of organic carbon, especially in glacial period where R2 reach up to 0.70. This correlation is much weaker during Holocene. In conclusion, large amount of suspended particles from Taiwan do play an important role in diluting biogenic sediments. During the last glacial and the transition period, siliceous shell was a major source of sediment organic carbons in the northeastern South China Sea’s sediments. The amount of biogenic silica in last glacial is relatively higher than in Holocene. Saulwood Lin 林曉武 2014 學位論文 ; thesis 50 zh-TW |
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碩士 === 國立臺灣大學 === 海洋研究所 === 102 === Biogenic silica, as well as carbonaceous particles, are the most important types of biogenic sediments. For the South China Sea area where huge amount of terrigenous particles from small rivers of the surrounding islands and large rivers play a very important role in transporting land derived materials to the ocean, however, the exact amount of terrigenous materials from land to the ocean may subject to climate change and varied in times. In addition, sea temperature fluctuation may also affect ocean productivity in the area. There is little study on the variation(s) of sediment deposition with respect to the temporal variation, in particular, and area subjecting to climatic changes.
Biogenic sediments mainly compose of biogenic silica, organic carbon and calcium carbonate. Biogenic Silica (BSi) is the amorphous silicon content which is usually determined by wet chemical extraction. It is also known as or referred to as biogenic opal (Opal). Main sources of the biogenic silica in sediment come from diatoms, radiolarians, silicoflagellates and sponge spicules and other siliceous organisms, with their skeletons accumulated on the seabed. Biogenic silica content variation in sediments usually indicate a change(s) of oceanic paleoproductivity. Changes of paleoproductivity were closely related to the status of paleoseawater nutrient and the change of paleoclimatic condition. Hence, sedimentary record of biogenic silica could serve as an indicator of large scale changes of the ancient oceans or paleoclimatic (e.g. glacial or interglacial) change.
The result of this study showed that biogenic silica content in sediments in the northeastern South China Sea at sampling site AG (ssAG; Latitude: 20.05° N, Longitude: 118.10° E) range between 3.68% and 9.20%, with an average of 5.64 ± 1.92%, and at site 2914 (ss2914; Latitude: 22.03° N, Longitude: 119.85 ° E) range between 1.63% and 6.40%, with an average of 3.57 ± 1.47%. From the perspective of spatial scales, ssAG is further away from Taiwan compare to ss2914. ssAG has much higher level of biological source of sediment. The amount of biogenic silica in both ssAG and ss2914 are relatively low for Holocene and high during the last glacial. In between, the amount of biogenic silica correlate very well with the amount of organic carbon, especially in glacial period where R2 reach up to 0.70. This correlation is much weaker during Holocene.
In conclusion, large amount of suspended particles from Taiwan do play an important role in diluting biogenic sediments. During the last glacial and the transition period, siliceous shell was a major source of sediment organic carbons in the northeastern South China Sea’s sediments. The amount of biogenic silica in last glacial is relatively higher than in Holocene.
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author2 |
Saulwood Lin |
author_facet |
Saulwood Lin Hsu-Pin Tsai 蔡旭濱 |
author |
Hsu-Pin Tsai 蔡旭濱 |
spellingShingle |
Hsu-Pin Tsai 蔡旭濱 The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea |
author_sort |
Hsu-Pin Tsai |
title |
The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea |
title_short |
The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea |
title_full |
The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea |
title_fullStr |
The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea |
title_full_unstemmed |
The Effect of Environmental Change on Biogenic Silica Temporal Variation in Sediments of the Northeastern South China Sea |
title_sort |
effect of environmental change on biogenic silica temporal variation in sediments of the northeastern south china sea |
publishDate |
2014 |
url |
http://ndltd.ncl.edu.tw/handle/24487319147452205469 |
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