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Multi-biomarker Reconstruction of Glacial/interglacial Ecological Environment Changes in the Japan Sea

Author: ZhangRongPing
Tutor: ZhaoMeiXun
School: Ocean University of China
Course: Marine Chemistry
Keywords: Biomarker Sea of ??Japan Sea surface temperature Productive forces Phytoplankton Community structure
CLC: X145
Type: Master's thesis
Year: 2010
Downloads: 80
Quote: 0
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Abstract


Multi-parameter biomarker method as a new geochemical indicators, has been widely used in the ancient ecological environment to rebuild some of the sea because of its clear source, nature and stability, the use of multi-parameter biomarker sediment reconstruction of phytoplankton productivity and community structure changes. However, in the Sea of ??Japan is still relatively weak. This article by a biomarker analysis of sediment cores in the Sea of ??Japan ODP 797 (38.62 ° N, 134.54 ° E), reconstruction of the past 166 ka the Ancient sea surface temperature, marine primary productivity of phytoplankton community structure changes from a new explore the changes of the ecological environment in the Sea of ??Japan. Use of long-chain alkenones saturation rebuilt 166 ka the the Ancient sea surface temperature (SST), results are displayed in the glacial (MIS 2-4, MIS 6) sea surface temperature in the interglacial (MIS 1, MIS 5) seawater The surface temperature is high, and the glacial / interglacial temperature fluctuating (temperature changes in the range of 3.8 to 21.6 ° C). Changes in sea surface temperature in the Sea of ??Japan is closely related with the East Asian monsoon, the flow of the Tsushima Warm and subarctic front position change. In the Last Glacial Maximum (LGM) the period reconstructed U37κ sea surface temperature, may be due to the surface seawater salinity decreases, the low content of long-chain ketene deviation caused so U37K'SST calculation equation. The ODP 797 sediment cores biomarkers found that long-chain ketene only in MIS 5, high value, and several other biomarkers are present in the glacial and interglacial high value, but Haiyuan biomarkers terrigenous biomarkers ratio interglacial (MIS 1, MIS 5) high value glacial period (MIS 2-4, MIS 6) low value of the phenomenon, indicating that the Sea of ??Japan marine primary productivity during glacial low interglacial high This is consistent with the results of previous studies. With the lowering of sea level during glacial times, into the Sea of ??Japan on the Tsushima warm current flow decreases the level of the primary productivity of the Sea of ??Japan, but because of the water column stratification, bottom water hypoxia, organic matter better save biomarker content of high value; interglacial Tsushima warm current flow increases, the the sufficient nutrients supplied to the Sea of ??Japan, Sea of ??Japan, primary productivity improve biomarker content of high value. By long-chain ketene, of the rapeseed sterol and dinosterol relative percentage change rebuild changes in phytoplankton community structure in the Sea of ??Japan, and the results show that from glacial to inter-glacial coccolithophores increased competitive advantage, diatoms, dinoflagellates competitive advantage is reduced, that the glacial to interglacial Sea of ??Japan phytoplankton community structure by siliceous organisms (diatoms) calcareous organisms (coccolithophores) conversion. Community structure of this trend is mainly controlled by salinity, low glacial sea level, the East China Sea coast of the low-salt flow and land-based sources of freshwater relative increases, reducing the Sea of ??Japan salinity of surface waters of the Sea of ??Japan on the Tsushima Warm contribution coccolith contribution of low-value; the Tsushima Warm interglacial high temperature and high salt flow increased competitive advantage for coccolithophores increase. The community structure of this trend with the previous conclusions obtained with microfossils likely reason is that the biogenic silicon microfossils and biogenic calcium in the reconstruction of the community structure by different dissolution control.

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