有确凿证据的南极绕极流南极洲的冰川作用后发展吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 07 - t07:21:38z //www.hoelymoley.com/feeds/question/3201 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/3201 11 有确凿证据的南极绕极流南极洲的冰川作用后发展吗? user889 //www.hoelymoley.com/users/0 2015 - 01 - 06 - t10:09:05z 2015 - 01 - 15 - t14:15:22z < p >南极绕极流(ACC)是连续的海洋环绕南极大陆,通常是解释在文献中是在南极洲冰川作用的发病的原因。< / p > < p >然而,2013年的一项研究,在本文< a href = " http://geology.gsapubs.org/content/early/2013/07/10/G34352.1.abstract " >一个势垒深南极绕极流到中新世末?< / >,表明ACC才完全开发中新世末期,由于当前被火山弧德雷克海峡,ACC的重要性并没有在全球变冷Eocene-Oligocene边界,但在加强中新世末的南极洲的冰川作用。< / p > < p > < >强有确凿证据的南极绕极流南极洲的冰川作用后发展? < /强> < / p > //www.hoelymoley.com/questions/3201/-/4268 # 4268 5 plannapus回答的有确凿证据的南极绕极流南极洲的冰川作用后发展吗? plannapus //www.hoelymoley.com/users/87 2015 - 01 - 15 - t13:45:27z 2015 - 01 - 15 - t14:15:22z < p > <强>莱尔et al。(2007) < / >强,纸你提到前,还想出了这个主意,ACC启动< em >现代设置< / em >(即列)和混合强劲水流在渐新世末期(ca。25马),所以大约10后最高产量研究Eocene-Oligocene南极冰川作用被认为是何时发生的。他们的证据是基于沉积学,特别是侵蚀的存在结构与深电流有关。然而他们不丢弃在这篇文章中,表面< em > < / em > ACC在此之前就已存在。< / p > < p >最初的想法(<强> Kennett 1977 < /强>)根据Eocene-Oligocene附近的ACC开始转型是基于生物沉积相模式的观察(ACC的南方传统硅质和碳质北)加上开放的观察周围的德雷克海峡。后,观察南极建立特有的浮游动物在最新的始新世(e . g。<强>拉撒路,Caulet 1993 < /强>,<强>拉撒路et al . 2008 < /强>)和测量钕同位素(<强>谢尔,马丁,2006 < /强>)Agulhas岭(即非洲南部),恰逢太平洋海域加强假设值。< / p > < p >然而,这个想法,南极冰川作用的结果ACC的设置已经有些挑战(<强>德康多,波拉德,2003 < /强>,后来<强>巴克,托马斯,2004 < /强>)主要基于数值模拟,表明,尽管发达ACC会参与冷却引发冰川作用,它不是一个必要条件:冰川作用可能完全是由于观察到的大气美元p_ \ mathrm{二氧化碳}$,即使没有一个发达ACC。< br >此外,一些证据为早日ACC的设置(即相变化参数)很可能是冰川作用的结果而不是ACC的后果(<强>巴克, Thomas, 2004).

So, as far as I see, we are at a stand-off, where we have arguments in favor of a late settling of the ACC (mostly sedimentary and tectonic arguments) and at the same time arguments in favor of an early settling (in particular paleontological and geochemical arguments) and no real reason to discard any.

References:
Barker & Thomas, 2004. Origin, signature and palaeoclimatic influence of the Antarctic Circumpolar Current. Earth-Science Reviews, 66: 143-162.
De Conto, R.M., Pollard, D., 2003. Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric $\mathrm{CO_2}$. Nature 421, 245 – 249.
Kennett, J.P., 1977. Cenozoic evolution of Antarctic glaciation, the circum-Antarctic Ocean, and their impact on global paleoclimate. Journal of Geophysical Research, 82: 3843–3860.
Lazarus, D. B. & J.-P. Caulet, 1993. Cenozoic Southern Ocean reconstructions from sedimentologic, radiolarian and other microfossil data. In J. P. Kennett and D. A. Warnke (Eds), The Antarctic Paleoenvironment: a perspective on global change. Antarctic Research Series, 60: 145-174.
Lazarus, D. B. et al., 2008. Patterns of opal and radiolarian change in the Antarctic mid-Paleogene: clues to the origin of the Southern Ocean. Micropaleontology, 54(1): 41-48.
Lyle et al., 2007. Late Oligocene initiation of the Antarctic Circumpolar Current: Evidence from the South Pacific. Geology, 35: 691-694.
Scher, H. D. & Martin, E. E., 2006. Timing and Climatic Consequences of the Opening of Drake Passage. Science, 312: 428-430.

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