| Planktonic Foraminiferal Assemblage Variations of Ontong-Java Plateau during Late Quaternary and Their Implications for Paleotemperature in the Western Pacific Warm Pool |
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| 作者姓名： | JinHaiyan JianZhimin TianJun |
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| 作者单位： | LaboratoryofMarineGeology,TongjiUniversity,Shanghai200092,China |
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| 基金项目： | ThispaperissupportedbytheNationalNaturalScienceFoundationofChina(No.40125015)，NKBRSFProject(No.G2000078502)，theHuoYingdongYoungTeacherFoundationoftheMinistryofEducationofChina(No.81015)andtheNational“TenthFiveYear”PlanoftheChinaOceanMineralResourcesRes |
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| 摘 要： | Ocean Drilling Program (ODP) Site 807A was recovered from the Ontong-Java plateau, western equatorial Pacific. Quantitative analysis of planktonic foraminifera, combined with oxygen and carbon isotope data, reveals the glacial-interglacial variations of sea-surface temperature and the upper water vertical structure in this region during the late Quaternary. Our results indicate that since 530 ka sea-surface temperature (SST) and the depth of thermocline (DOT) have changed significantly in the western Pacific warm pool (WPWP). The average glacial-interglacial annual SST difference was up to 4.2 ℃ , and the DOT fluctuations could exceed more than 100 m, further suggesting the instability of the WPWP. The spectral analyses of SST and DOT reveal two dominating cyclicities--the typical 100 ka cycle and the semi-precessional cycle, which is significant in the tropical spectrum, indicating that late Quaternary paleoceanographic changes in the study area were influenced not only by a high latitude forcing but also by tropic-driving factors.
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| 关 键 词： | 海洋生物学 有孔虫目 太平洋西部暖池 表面温度 浮游生物 海洋-大气观测 |
Planktonic Foraminiferal Assemblage Variations of Ontong-Java Plateau during Late Quaternary and Their Implications for Paleotemperature in the Western Pacific Warm Pool |
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| JinHaiyan JianZhimin TianJun.Planktonic Foraminiferal Assemblage Variations of Ontong-Java Plateau during Late Quaternary and Their Implications for Paleotemperature in the Western Pacific Warm Pool[J].Journal of China University of Geosciences,2004,15(4):365-371. |
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| Authors: | Jin Haiyan JIAN Zhimin Tian Jun |
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| Abstract: | Ocean Drilling Program (ODP) Site 807A was recovered from the Ontong-Java plateau, western equatorial Pacific. Quantitative analysis of planktonic foraminifera, combined with oxygen and carbon isotope data, reveals the glacial-interglacial variations of sea-surface temperature and the upper water vertical structure in this region during the late Quaternary. Our results indicate that since 530 ka sea-surface temperature (SST) and the depth of thermocline (DOT) have changed significantly in the western Pacific warm pool (WPWP). The average glacial-interglacial annual SST difference was up to 4.2 ℃, and the DOT fluctuations could exceed more than 100 m, further suggesting the instability of the WPWP. The spectral analyses of SST and DOT reveal two dominating cyclicities-the typical 100 ka cycle and the semi-precessional cycle, which is significant in the tropical spectrum, indicating that late Quaternary paleoceanographic changes in the study area were influenced not only by a high latitude forcing but also by tropic-driving factors. |
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| Keywords: | planktonic foraminifera western Pacific warm pool sea-surface temperature depth of thermocline late Quaternary |
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