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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau
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Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau

机译：冰川对末次冰川周期平衡线高度的敏感性和重建：青藏高原西部Nyaicientanggulha Shan Payuwang山谷的冰川模型

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Glaciers respond sensitively to climate change and paleoclimate conditions can be inferred from the geomorphic evidence by reconstructing equilibrium line altitude (ELA) and by modeling glacier mass balance and ice flow. However, such work has not been extensively carried out on the vast Tibetan Plateau, and thus the knowledge of glacier sensitivity to paleoclimate change and paleoglacier volume is still lacking on the plateau. Recent improvements in understanding glacial extent and chronology in the Payuwang Valley, southern Tibetan Plateau, present an opportunity to estimate the paleoclimate conditions during the Last Glacial cycle. Using a coupled mass-balance and ice-flow model, this study tests the glacier sensitivity to ELA change in the Payuwang Valley. By fitting modeled glaciers to the corresponding moraine positions, we reconstruct glacier extents probably occurred at oxygen isotope stage 3 (MIS 3) and Last Glacial Maximum (LGM) in the valley and infer the related climate conditions that could have supported these glacier advances. The glacier sensitivity tests indicate that in the Payuwang Valley, the glaciers responded to centennial-scale shifts in climate. With ELAs below 5600 m asl, the tributary glaciers coalesce into the main valley and expand rapidly there. The model results also show that the Payuwang Valley contained ice volumes of similar to 1.58 x 10(9) m(3) and similar to 1.23 x 10(9) m(3) with EM lowering values of 370 m and 340 m in the MIS 3 and LGM glacial advances, respectively. By examining other independent paleodimatic reconstructions, we conclude that during the MIS 3 glacier advance, the temperature was only 15 degrees C lower or even 0.2 degrees C higher than the period of 2005-2008 with precipitation 40-100% higher than the 2005-2008 amount; and during the LGM glacier advance, the temperature was 3.3-4.4 degrees C lower than the period of 2005-2008 with the precipitation 30-70% lower than the 2005-2008 amount. These estimates add to the knowledge of better understanding the relationship between glacier dynamic and climatic change on the Tibetan Plateau. (C) 2015 Elsevier B.V. All rights reserved.
机译：冰川对气候变化反应灵敏，可以通过重建平衡线高度（ELA）并通过对冰川质量平衡和冰流建模来从地貌证据推断出古气候条件。然而，这种工作尚未在广阔的青藏高原上广泛开展，因此高原上仍然缺乏冰川对古气候变化敏感性和古冰川体积的知识。在青藏高原南部的帕尤旺河谷，人们对冰川范围和年代学的理解有了新的进步，这为估算上一个冰川周期的古气候条件提供了机会。本研究使用质量平衡和冰流耦合模型，测试了帕尤旺河谷冰川对ELA变化的敏感性。通过将模型化的冰川拟合到相应的冰positions位置，我们重建了可能发生在山谷中氧同位素第3阶段（MIS 3）和最后冰川最大（LGM）的冰川范围，并推断了可能支持这些冰川发展的相关气候条件。冰川敏感性测试表明，在Payuwang流域，冰川对百年尺度的气候变化做出了响应。当海拔高度低于5600 m的ELA时，支流冰川汇聚到主谷中并在那里迅速扩张。模型结果还显示，Payuwang谷包含的冰量大约为1.58 x 10（9）m（3），大约为1.23 x 10（9）m（3），在EM值分别为370 m和340 m MIS 3和LGM的冰川发展。通过研究其他独立的古生物学重建，我们得出结论，在MIS 3冰川前进期间，温度仅比2005-2008年低15摄氏度，甚至高0.2摄氏度，降水量比2005-2008年高40-100％量;在LGM冰川发展期间，温度比2005-2008年低3.3-4.4摄氏度，降水量比2005-2008年低30-70％。这些估计增加了对更好地了解青藏高原冰川动态与气候变化之间关系的认识。 （C）2015 Elsevier B.V.保留所有权利。

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