The last two glacial cycles in central Patagonia: A precise record from the Ñirehuao glacier lobe
The last two glacial cycles in central Patagonia: A precise record from the Ñirehuao glacier lobe
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巴塔哥尼亚中部最后两次冰川周期：来自阿热瓦奥冰川叶的精确记录
DOI：
10.1016/j.quascirev.2022.107873
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发表时间：
2023
影响因子：
4
通讯作者：
Schaefer, Joerg M.
中科院分区：
文献类型：
--
作者：
Peltier, Carly;Kaplan, Michael R.;Sagredo, Esteban A.;Moreno, Patricio I.;Araos, José;Birkel, Sean D.;Villa-Martínez, Rodrigo;Schwartz, Roseanne;Reynhout, Scott A.;Schaefer, Joerg M.
米兰科维奇轨道参数控制着太阳辐射的周期，太阳辐射是气候长期变化的主要标志，但太阳辐射信号在气候系统中如何在地球仪周围传播还不清楚。为了解决冰河时代气候何时以及如何开始和结束的基本问题，冰川在最后一次冰消期退缩的速度有多快，以及冰川在人为影响之前的行为，我们需要强大的冰川年表。然而，由于冰碛随时间的推移而退化，在末次冰期循环之后，当地冰川最大值的时间仍然基本上不受约束，限制了我们充分探索这些问题的能力。通过绘制详细的地貌表面地图并针对相对较高的山脊顶部巨石，我们构建了过去两个冰川循环中尼勒瓦奥冰川耳垂（45°S）冰川最大值的新的、精确的10 Be年代学。我们报告了巴塔哥尼亚MIS 6冰川前进的第一个直接定年记录之一，该冰川前进至少在153 ± 5.1 ka形成了一组主要的冰碛，在137 ± 4.2 ka形成了一个静止或较小的再前进，对应于MIS 6在南极洲的两个最冷和最多尘的时期。下一个最大的推进发生在23.6 ± 0.9 ka，在南半球MIS 2冷却高峰结束时。冰川的退缩开始于距今约18.5 cal ka BP，当时西南部支流山谷中的湖泊变得无冰。总的来说，我们发现，发生在南极洲周围的冬季海冰是膨胀的，并在其最小的离心率和离心率的阿西热华奥冰川叶的进步。
Milankovitch orbital parameters control cycles of insolation, a primary pacer of long term changes in climate, but exactly how insolation signals are transmitted around the globe in the climate system is unclear. In order to address the fundamental questions of when and how ice age climates begin and end, how fast glaciers retreated during the last deglaciation, and how glaciers behaved before anthropogenic influence, we need robust glacial chronologies. The timing of local glacial maxima beyond the last glacial cycle, however, has remained largely unconstrained due to moraine degradation over time, limiting our ability to fully explore these questions. By developing a detailed geomorphic surficial map and targeting relatively tall, ridge-top boulders, we have constructed a new, precise10Be chronology of glacial maxima of the Ñirehuao glacier lobe (45°S) for the last two glacial cycles. We report one of the first directly dated records of a MIS 6 glacier advance in Patagonia, which formed a major set of moraines by at least 153 ± 5.1 ka, with a stillstand or smaller readvance by 137 ± 4.2 ka, corresponding to the two coldest and dustiest periods of MIS 6 in Antarctica. The next largest advance occurred at 23.6 ± 0.9 ka, at the end of peak Southern Hemisphere MIS 2 cooling. Retreat of the glacier commenced by ∼18.5 cal ka BP when lakes in a tributary valley just to the southwest became ice-free. Overall we find that advances of the Ñirehuao glacier lobe occur when winter sea ice around Antarctica is expansive and both obliquity and eccentricity are at their minima.
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影响因子：
4
作者：
J. Schaefer;A. Putnam;G. Denton;M. Kaplan;S. Birkel;A. Doughty;Sam Kelley;D. Barrell;Robert C. Finkel;G. Winckler;Robert F. Anderson;U. Ninneman;S. Barker;R. Schwartz;B. G. Andersen;C. Schluechter
通讯作者：
J. Schaefer;A. Putnam;G. Denton;M. Kaplan;S. Birkel;A. Doughty;Sam Kelley;D. Barrell;Robert C. Finkel;G. Winckler;Robert F. Anderson;U. Ninneman;S. Barker;R. Schwartz;B. G. Andersen;C. Schluechter
影响因子：
5.8
作者：
Doughty, Alice M.;Schaefer, Joerg M.;Schwartz, Roseanne
通讯作者：
Schwartz, Roseanne
影响因子：
5.3
作者：
Kaplan, Michael R.;Strelin, Jorge A.;Travis, Scott G.
通讯作者：
Travis, Scott G.
巴塔哥尼亚山脉中部艾森盆地阿普第凝灰岩锥的 40Ar/39Ar 和 U-Pb SHRIMP 定年
影响因子：
1.8
作者：
M. Suárez;A. Demant;R. D. L. Cruz;C. Fanning
通讯作者：
C. Fanning
末次盛冰期和终止期间智利巴塔哥尼亚 Última Esperanza 冰瓣（南纬 52°）的波动 1
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
E. Sagredo;P. Moreno;R. Villa;M. Kaplan;P. Kubik;C. Stern
通讯作者：
C. Stern