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首页> 外文期刊>Paleoceanography >Ventilation of the abyssal Southern Ocean during the late Neogene:A new perspective from the subantarctic Pacific
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Ventilation of the abyssal Southern Ocean during the late Neogene:A new perspective from the subantarctic Pacific

机译：新近纪晚期深海南部海洋的通风：亚极太平洋的新视角

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[1] Benthic foraminiferal stable carbon isotope records from the South Atlantic show significant declinestoward more "Pacific-like" values at and —2.7 Ma, and it has been posited that these shifts may mark stepstoward increased CO_2sequestration in the deep Southern Ocean as climate cooled over the late Neogene. Wegenerated new stable isotope records from abyssal subantarctic Pacific cores MV0502-4JC and ELT 25-11. Therecord from MV0502-4JC suggests that the Southern Ocean remained well mixed and free of vertical orinterbasinal ε ~13C gradients following the late Miocene carbon shift (LMCS). According to the records fromMV0502-4JC and ELT 25-11, however, cold, low ε ~13C bottom waters developed in the Southern Ocean thelate Pliocene and persisted until —1.7 Ma. These new data suggest that while conditions in the abyssal SouthernOcean following the LMCS were comparable to the present day, sequestration of respired CO2 may haveincreased in the deepest parts of the Southern Ocean during the late Pliocene, a critical period for the growthand establishment of the Northern Hemisphere ice sheets.
机译：[1]来自南大西洋的底栖有孔虫稳定碳同位素记录显示，在-2.7 Ma和-2.7 Ma处显着下降，直至出现更多的“太平洋样”值，并且据推测，这些变化可能标志着随着气候变冷，南海深处的CO_2固存增加在新近的晚期。我们从深海亚太平洋太平洋核MV0502-4JC和ELT 25-11生成了新的稳定同位素记录。 MV0502-4JC的记录表明，在中新世晚期碳位移（LMCS）之后，南大洋仍保持良好的混合状态，没有垂直或基底间的ε〜13C梯度。但是，根据MV0502-4JC和ELT 25-11的记录，在上新世晚期南海发育了寒冷，低ε〜13C的底水，一直持续到–1.7 Ma。这些新数据表明，虽然LMCS之后深海南部海洋的状况与今天相当，但在上新世晚期，即北半球的生长和建立的关键时期，南大洋最深处的呼吸固碳量可能增加了。半球冰盖。

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