| Time-Frequency Variations of Plio-Pleistocene Foraminiferal Isotopes： A Case Study from Southern South China Sea |
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| 作者姓名： | TianJun WangPinxian ChengXinrong |
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| 作者单位： | LaboratoryofMarineGeology,TongjiUniversity,Shanghai200092,China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | The continuous wavelet transform (CWT) analysis reveals the instantaneous variability of the foraminiferal δ18O and δ13C of Site 1143 for the past 5 Ma at the eccentricity, obliquity and precession bands. The cross CWT analysis further demonstrates nonstationary phases of the benthic -δ18O relative to ETP at the three primary Milankovitch bands in the last 5 Ma. The instantaneous phases between benthic -δ18O and δ13C at the precession band display a prominent 128 ka period, probably the cyclicity of the nonstationary climate close to the eccentricity. To explain these nonstationary phases, it is desirable to introduce a nonlinear response model to the global climate system, in which the output has a prominent cycle around 100 ka to match the 128 ka cycle of the instantaneous phase of the δ13C and -δ18O on the precession band.
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| 关 键 词： | 小波变换 有孔虫目 同位素 中国南海 气候循环 |
Time-Frequency Variations of Plio-Pleistocene Foraminiferal Isotopes:A Case Study from Southern South China Sea |
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| TianJun WangPinxian ChengXinrong.Time-Frequency Variations of Plio-Pleistocene Foraminiferal Isotopes:A Case Study from Southern South China Sea[J].Journal of China University of Geosciences,2004,15(3):283-289. |
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| Authors: | Tian Jun Wang Pinxian Cheng Xinrong |
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| Abstract: | The continuous wavelet transform (CWT) analysis reveals the instantaneous variability of the foraminiferal δ18O and δ13C of Site 1143 for the past 5 Ma at the eccentricity, obliquity and precession bands. The cross CWT analysis further demonstrates nonstationary phases of the benthic -δ18O relative to ETP at the three primary Milankovitch bands in the last 5 Ma. The instantaneous phases between benthic -δ18O and δ13C at the precession band display a prominent 128 ka period, probably the cyclicity of the nonstationary climate close to the eccentricity. To explain these nonstationary phases, it is desirable to introduce a nonlinear response model to the global climate system, in which the output has a prominent cycle around 100 ka to match the 128 ka cycle of the instantaneous phase of the δ13C and -δ18O on the precession band. |
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| Keywords: | wavelet analysis foraminiferal isotopes South China Sea |
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