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科学通报  2011 

早更新世赤道太平洋上部水体结构的东西向不对称格局的形成

, PP. 1635-1641

Keywords: 赤道太平洋,,碳同位素,,西向不对称格局,次表层水,早更新世

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Abstract:

选取大洋钻探ODP130航次在西太平洋暖池钻取的807站A孔上段43m岩芯样品为研究材料,进行浮游有孔虫表层水种、次表层水种的氧、碳稳定同位素分析,并与赤道东太平洋ODP851站的记录比较,揭示了赤道太平洋海区距今2.5Ma以来上部水体的古海洋变迁.研究发现,早更新世1.6~1.4Ma时,赤道东、西太平洋表层水和次表层水的氧同位素都发生明显的分异,进一步证实赤道太平洋类似于现代的东-西向温度梯度(表层水温西高东低)和上部水体温跃层西深东浅的不对称格局在当时最终形成.由于次表层水的氧同位素东-西向梯度变化大于表层水的,说明赤道东、西太平洋这种不对称格局的形成应该与东太平洋温跃层变浅、次表层水显著降温关系更为密切.此外,~1.6Ma之后,赤道太平洋表层水和次表层水的碳同位素差异明显变小,且其偏心率长周期也从400ka变为~500ka,反映了大洋碳储库的改组,可能与这一时期南大洋深部水的改组及其对热带太平洋(特别是次表层海水)的影响加剧有关,说明热带系统可以在全球气候变化中起重要作用

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