Climates during Late Quaternary glacier advances: glacier-climate modeling in the Yingpu Valley, eastern Tibetan Plateau
Climates during Late Quaternary glacier advances: glacier-climate modeling in the Yingpu Valley, eastern Tibetan Plateau
复制标题
晚第四纪冰川推进期间的气候：青藏高原东部营普河谷的冰川气候模型
DOI：
10.1016/j.quascirev.2014.07.007
复制
发表时间：
2014
影响因子：
4
通讯作者：
XiangKe Xu
中科院分区：
文献类型：
--
作者：
XiangKe Xu
末次盛冰期（LGM）的特征是地球气候的大幅冷却，之后气候演变为过去100 ka中最大的重新配置。尽管末次盛冰期对青藏高原东部地区的气候变化具有重要意义，但对末次盛冰期前后青藏高原东部地区气候变化的认识还很欠缺。青藏高原东部英普河谷冰川活动范围和年代学研究的进展为估算末次盛冰期及其以后的冰川气候条件提供了机会。利用一个相对较新的冰川气候模型，本研究重建冰川进步在英普谷和量化的相关气候条件在末次盛冰期，晚冰期，晚全新世冰期。模拟结果表明，在连续的三次冰期中，英浦流域的冰量分别为1.65、1.03和0.29 km 3，平衡线高度（ELA）分别降低了1.500、1.410和1.150 m。通过对其他独立的古气候重建结果的分析，得出了在末次盛冰期、晚冰期和晚全新世冰期，温度分别下降了4.0-5.9 °C、3.4-3.7 °C和0.3-0.6 °C，降水量分别为现代值的40- 80%、80- 100%和100-110%的结论。三个冰期的气候估计与青藏高原其他气候代用资料和大气环流模拟结果基本一致。
The Last Glacial Maximum (LGM) featured a major cooling of Earth's climate, after which the climate evolved in the largest reconfiguration of the past 100 ka. Despite its significance, full understanding of the climate history during and since the LGM is still lacking on the eastern Tibetan Plateau. Recent improvements in understanding glacial extents and chronologies in the Yingpu Valley, eastern Tibetan Plateau present an opportunity to estimate the glacial climatic conditions during and since the LGM. Using a relatively new glacier-climate model, this study reconstructs glacier advances in the Yingpu Valley and quantifies the related climate conditions during the LGM, Lateglacial, and Late Holocene glacial stages. The model results show that the Yingpu Valley contained ice volumes of ∼1.65 km3, 1.03 km3, and 0.29 km3with equilibrium line altitude (ELA) lowering values of ∼500 m, ∼410 m, and ∼150 m in the three successive glacial stages, respectively. By examining other independent paleoclimatic reconstructions, it is concluded that the temperature decreased by 4.0–5.9 °C, 3.4–3.7 °C, 0.3–0.6 °C with the precipitation amounts being 40–80%, 80–100%, and 100–110% of modern values during the LGM, Lateglacial, and Late Holocene glacial stages, respectively. The climate estimates for the three glacial stages are generally in agreement with other climatic proxy records on the Tibetan Plateau and atmospheric circulation modeling results.