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赤道西太平洋晚第四纪古生产力变化:来自元素比值的证据

, PP. 276-283

Keywords: 晚第四纪,古生产力,Ba/Ti,Ca/Ti,XRF,赤道西太平洋

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Abstract:

通过对热带碳循环"973"项目于2008年暖池区专题航次采集的KX08-97321-2柱状样(01°25.01'S,157°58.91'E;水深1897m)进行Ⅹ射线荧光光谱(XRF)扫描以及浮游有孔虫氧同位素测定,结果发现,ln(Ba/Ti)和ln(Ca/Ti)指示的赤道西太平洋古生产力在过去的370ka以来具有明显的冰期-间冰期变化和岁差周期。间冰期ln(Ba/Ti)的平均值比冰期的高13%,说明古生产力冰期低、间冰期高。然而,温跃层替代指标显示该海域温跃层深度的变化不具有简单的冰期-间冰期变化模式,说明温跃层深度不是控制该地区古生产力的主要因素。相反,该地区温跃层的营养物供给受南大洋的影响,可能是影响古生产力的重要原因之一,且可能是高低纬度过程的相互作用导致古生产力变化出现29ka和19ka的周期。

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