| 中更新世气候转型期西太平洋暖池的表层海水温度和氧同位素变化 |
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| 引用本文： | 金海燕,翦知湣,乔培军,成鑫荣.中更新世气候转型期西太平洋暖池的表层海水温度和氧同位素变化[J].海洋地质与第四纪地质,2012(4):107-113. |
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| 作者姓名： | 金海燕 翦知湣 乔培军 成鑫荣 |
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| 作者单位： | 同济大学海洋地质国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目(40806020,91028004,41023004) |
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| 摘 要： | 通过对大洋钻探(ODP)第130航次807站A孔井深12.54～16.38m沉积物中浮游和底栖有孔虫的稳定同位素δ18 O以及浮游有孔虫壳体的Mg/Ca测试,揭示了中更新世气候转型期(800～1 000kaBP)西太平洋暖池表层海水温度和氧同位素的变化。研究发现,中更新世时期ODP 807站的表层海水温度在25.1～30.9℃之间浮动,平均为28.4℃,接近现代暖池区实测温度值,冰期/间冰期之间的温度差值在1.5～5℃左右,与晚第四纪时的温差相近;同时,表层海水温度和底栖有孔虫氧同位素呈现同步变化的趋势,没有明显的超前或滞后的相位关系,区别于前人在暖池区的研究结果。间冰期时,表层海水温度上升伴随着温跃层变深、盐度降低,与现代西太平洋暖池La Ni珘na状态类似;冰期时则类似于El Ni珘no状态。中更新世气候转型期,西太平洋暖池的表层海水温度、温跃层深度变化受低纬热带驱动影响,都显示出强烈的岁差周期(16.8ka),而底层水氧同位素更多受到高纬的影响。
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| 关 键 词： | 中更新世气候转型期 表层海水温度 氧同位素 西太平洋暖池 |
THE SEA SURFACE TEMPERATURE AND OXYGEN ISOTOPE CHANGES IN THE WESTERN PACIFIC WARM POOL DURING THE MID-PLEISTOCENE TRANSITION PERIOD |
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| JIN Haiyan,JIAN Zhimin,QIAO Peijun,CHENG Xinrong.THE SEA SURFACE TEMPERATURE AND OXYGEN ISOTOPE CHANGES IN THE WESTERN PACIFIC WARM POOL DURING THE MID-PLEISTOCENE TRANSITION PERIOD[J].Marine Geology & Quaternary Geology,2012(4):107-113. |
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| Authors: | JIN Haiyan JIAN Zhimin QIAO Peijun CHENG Xinrong |
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| Institution: | (State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092) |
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| Abstract: | The oxygen isotopic data of planktonic and benthic foraminifera,combined with the Mg/Ca ratio of planktonic foraminifera for the interval of 12.54 ~16.38 m of the core taken at Ocean Drilling Program(ODP) Site 807A were used to reveal the sea surface temperature(SST) and oxygen isotope change history in the western Pacific Warm Pool(WPWP) during the mid-Pleistocene transition period 800~1000 kaBP.During this period,the SST at ODP 807 changed from 25.1 ℃ to 30.9 ℃ with an average of 28.4 ℃ and the glacial/interglacial differences reached 1.5 ~ 5 ℃,similar to the difference in late Quaternary.Meanwhile,the SST and benthic oxygen isotope changed synchronously.There is no obvious leading or lagging phase relationship between them,different from the previous results in this area.In the interglacials,the pattern of high SST,deeper thermocline and lower salinity at ODP 807 were analogous to the modern La Nia in the WPWP;while in the glacials,the proxy variations in accord with the modern El Nio condition.During the mid-Pleistocene transition period,the changes in SST and depth of thermocline(DOT) at ODP 807 were forced mainly by the low latitude tropical driving,and both showed a strong precession signal(16.8 ka).However,the benthic oxygen variations are affected by high latitude. |
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| Keywords: | mid-Pleistocene transition sea surface temperature oxygen isotope the western Pacific warm pool |
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