globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.07.029
Scopus记录号: 2-s2.0-84994000492
论文题名:
Evaluating the timing of former glacier expansions in the Tian Shan: A key step towards robust spatial correlations
作者: Blomdin R.; Stroeven A.P.; Harbor J.M.; Lifton N.A.; Heyman J.; Gribenski N.; Petrakov D.A.; Caffee M.W.; Ivanov M.N.; Hättestrand C.; Rogozhina I.; Usubaliev R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 153
起始页码: 78
结束页码: 96
语种: 英语
英文关键词: 10Be surface exposure dating ; Glacial geomorphology ; Paleoglaciation ; Tian Shan
Scopus关键词: Climate change ; Timing circuits ; Cosmogenic exposure ; Glacial geomorphology ; Marine oxygen isotopes ; Paleoglaciation ; Spatial correlations ; Surface exposure age ; Surface exposure dating ; Tian Shan ; Glacial geology ; beryllium isotope ; dating method ; expansion ; geochronology ; geomorphology ; glacial hydrology ; glaciation ; glacier ; marine isotope stage ; paleoclimate ; paleogeography ; proxy climate record ; spatial analysis ; Central Asia ; Tien Shan
英文摘要: The timing of past glaciation across the Tian Shan provides a proxy for past climate change in this critical area. Correlating glacial stages across the region is difficult but cosmogenic exposure ages have considerable potential. A drawback is the large observed scatter in 10Be surface exposure data. To quantify the robustness of the dating, we compile, recalculate, and perform statistical analyses on sets of 10Be surface exposure ages from 25 moraines, consisting of 114 new and previously published ages. We assess boulder age scatter by dividing boulder groups into quality classes and rejecting boulder groups of poor quality. This allows us to distinguish and correlate robustly dated glacier limits, resulting in a more conservative chronology than advanced in previous publications. Our analysis shows that only one regional glacial stage can be reliably correlated across the Tian Shan, with glacier expansions occurring between 15 and 28 ka during marine oxygen isotope stage (MIS) 2. However, there are examples of older more extensive indicators of glacial stages between MIS 3 and MIS 6. Paleoglacier extent during MIS 2 was mainly restricted to valley glaciation. Local deviations occur: in the central Kyrgyz Tian Shan paleoglaciers were more extensive and we propose that the topographic context explains this pattern. Correlation between glacial stages prior to late MIS 2 is less reliable, because of the low number of samples and/or the poor resolution of the dating. With the current resolution and spatial coverage of robustly-dated glacier limits we advise that paleoclimatic implications for the Tian Shan glacial chronology beyond MIS 2 are speculative and that continued work toward robust glacial chronologies is needed to resolve questions regarding drivers of past glaciation in the Tian Shan and Central Asia. © 2016 Elsevier Ltd
资助项目: We would like to acknowledge financial support from the Swedish Research Council (No. 2011-4892) to Stroeven and the National Geographic Society to Harbor and Lifton (Grant 9073-12), as well as additional support for field studies from the Swedish Society for Anthropology and Geography (SSAG) and the Margit Alhtin and Carl Mannerfelt stipends to Blomdin and Gribenski. PRIME Lab, Caffee, and Lifton acknowledge support from NSF (EAR-1153689). We received considerable support and help from Tom Clifton and Greg Chmiel at PrimeLab during
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59394
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作者单位: Geomorphology and Glaciology, Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, United States; Department of Physics and Astronomy, Purdue Rare Isotope Measurement Laboratory (PRIME Lab), Purdue University, West Lafayette, United States; Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Faculty of Geography, Lomonosov Moscow State University, Moscow, Russian Federation; MARUM, University of Bremen, Bremen, Germany; German Research Centre for Geosciences, Potsdam, Germany; Central Asian Institute of Applied Geosciences, Bishkek, Kyrgyzstan

Recommended Citation:
Blomdin R.,Stroeven A.P.,Harbor J.M.,et al. Evaluating the timing of former glacier expansions in the Tian Shan: A key step towards robust spatial correlations[J]. Quaternary Science Reviews,2016-01-01,153
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