Coupled nutricline and productivity variations during the Pliocene in the western Pacific warm pool and their paleoceanographic implications
Coupled nutricline and productivity variations during the Pliocene in the western Pacific warm pool and their paleoceanographic implications
复制标题
上新世西太平洋暖池营养素和生产力的耦合变化及其古海洋学意义
DOI：
10.1016/j.gloplacha.2022.103810
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发表时间：
2022-04
影响因子：
3.9
通讯作者：
Bingbin Qin
中科院分区：
文献类型：
--
作者：
Jiangnan Shi;Qi Jia;Dirk Nürnberg;Tiegang Li;Zhifang Xiong;Bingbin Qin
热带太平洋在上新世期间对全球气候变化起到了重要的调节作用。对上新世以来热带太平洋海面温度的研究表明，热带太平洋热平均状态的变化可以显著影响全球气候反馈，并将高纬度和低纬气候联系起来。热带生产力波动是全球碳循环运行的一个重要机制。然而，初级生产力的时间变化在西太平洋暖池(WPWP)并没有受到很好的限制，那里的海洋气候系统并不是由上升流系统主导的。此外，北极线动力学在推动构造时间尺度上的生产力方面的作用仍然不确定。在这里，我们利用相对高分辨率的有孔虫碳同位素记录，结合从WPWP的国际海洋发现计划(IODP)U1490站点获得的Ba/Ti比值，重建了5.1-2.6 Ma期间的中线深度和古生产力。我们的记录表明，在构造时间尺度上，Ntricline和生产力的变化是紧密耦合的，这意味着Ntricline的动态在调节WPWP的生产力方面发挥了重要作用。4.8-3.5 Ma期间较深的中线和较低的生产力可能是由于WPWP混合层的增厚而导致中美洲海道关闭所致。我们将3.5-3.0 Ma期间总体较浅的中线和生产力的增加与高纬度南部源水的增强影响和上升流对印度尼西亚海道的限制联系在一起。
The tropical Pacific played an important role in modulating global climate change during the Pliocene. Studies of tropical Pacific sea surface temperatures covering the period from the Pliocene onwards indicate that changes in the thermal mean state over the tropical Pacific can significantly influence global climate feedbacks and connect the high- and low-latitude climates. Tropical productivity fluctuations are a significant mechanism with respect to the operation of the global carbon cycle. Yet, temporal changes in primary productivity are not well constrained in the western Pacific warm pool (WPWP), where the ocean–climate system is not dominated by upwelling systems. Furthermore, the role of nutricline dynamics in forcing productivity over tectonic timescales remains uncertain. Here we use relatively high-resolution foraminiferal carbon isotope records combined with Ba/Ti ratios obtained from International Ocean Discovery Program (IODP) Site U1490 in the WPWP to reconstruct nutricline depth and paleoproductivity over the period 5.1–2.6 Ma. Our records imply that nutricline and productivity variations were closely coupled over tectonic timescales, implying that the dynamics of the nutricline play a significant role in regulating productivity in the WPWP. The deeper nutricline and lower productivity during 4.8–3.5 Ma might have been fostered by the closure of the Central American Seaway through the thickening of the mixed layer in the WPWP. We relate the overall shallower nutricline and increased productivity during 3.5–3.0 Ma to the restriction of the Indonesian Seaway via the enhanced influence and upwelling of high-latitude southern-source waters.
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影响因子：
1.5
作者：
Ryo Imai;Tokiyuki Sato;S. Chiyonobu;Y. Iryu
通讯作者：
Ryo Imai;Tokiyuki Sato;S. Chiyonobu;Y. Iryu
影响因子：
5.3
作者：
S. Mulitza;C. Rühlemann;T. Bickert;W. Hale;J. Pätzold;G. Wefer
通讯作者：
S. Mulitza;C. Rühlemann;T. Bickert;W. Hale;J. Pätzold;G. Wefer
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
64.8
作者：
Fedorov, A. V.;Brierley, C. M.;Ravelo, A. C.
通讯作者：
Ravelo, A. C.
DOI：
10.1016/s0031-0182(02)00508-4
发表时间：
2002-11
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
K. Grant;G. Dickens
通讯作者：
K. Grant;G. Dickens