Energy mass balance and flow modeling of early Holocene glaciers in the Queshque valley, Cordillera Blanca, Peru
Energy mass balance and flow modeling of early Holocene glaciers in the Queshque valley, Cordillera Blanca, Peru
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秘鲁布兰卡山脉奎什克山谷早期全新世冰川的能量质量平衡和流动模型
DOI：
10.1016/j.quascirev.2022.107414
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发表时间：
2022
影响因子：
4
通讯作者：
Sorensen, Mary
中科院分区：
文献类型：
--
作者：
Stansell, Nathan D.;Mark, Bryan G.;Licciardi, Joseph M.;Rodbell, Donald T.;Fairman, Jonathan G.;Schoessow, Forrest S.;Shutkin, Tal Y.;Sorensen, Mary
我们对热带安第斯山脉全新世早期气候变化的时间和模式的了解有限，这阻碍了我们评估低纬度和高纬度海洋大气动力学之间任何潜在联系的能力。越来越多的证据表明，秘鲁安第斯山脉的冰川在全新世早期有时会稳定下来，这表明存在一段较冷和/或较湿润的条件，中断了较温暖和干燥气候的总体模式。评估这些冰川波动的全球意义需要更好地量化这些明显变冷事件的性质和水文循环的任何变化。在这里，我们应用基于物理的冰川模型来重建和解释秘鲁布兰卡山脉奎什克山谷（南纬 9.8°）处于各种热带气候条件下的稳态古冰川。该模型使用基于激光雷达的数字高程模型（DEM）和每小时气象数据作为输入，计算全分布的表面能量和质量平衡（SEMB）。这种方法使我们能够以空间分辨率更好地捕捉环境变化的昼夜范围，这是该地区之前的古冰川建模工作无法实现的。然后根据响应 SEMB 输入的流量模型开发了古冰川的 3D 再现，并考虑了山谷地形。该模型通过模拟冰川进行了验证，该冰川与现代冰川面积限制的现场和卫星观测相匹配，以及与最近测量的主冰川舌探地雷达（GPR）剖面一致的冰厚度。在调整了全新世早期全球辐射值的变化，并使用区域古气候记录作为模型的约束条件后，使用 3.0 °C 的冷却和相对于今天增加 25% 的降水量，重建了山谷中全新世早期最大冰限，可追溯到约 10.8 (±0.1) ka。使用 2.8 °C 冷却重建了约 9.4 (±0.3) ka 的上游冰层范围，且相对于今天的降水量没有变化。这些结果表明，在全新世早期，条件足够寒冷和潮湿，有时足以维持冰川，尽管向干燥条件的转变加上适度温暖的温度导致了冰的退缩阶段，从至少~10.8ka到~9.4ka。这些结果表明，在全新世早期，随着冰盖的减少和高纬度地区环境条件的变化，南部热带气温和水文循环迅速重组。
Our limited knowledge of the timing and pattern of early Holocene climate variability in the tropical Andes hinders our ability to evaluate any potential linkages between low and high latitude oceanic-atmospheric dynamics. There is mounting evidence that glaciers in the Peruvian Andes stabilized at times during the early Holocene, suggesting there were periods of colder and/or wetter conditions that interrupted an overall pattern of a warmer and drier climate. Evaluating the global significance of these glacial fluctuations requires that the nature of these apparent cooling events and any shifts in the hydrologic cycle be better quantified. Here we apply a physically-based glacier model to reconstruct and interpret early Holocene-aged paleoglaciers in steady-state with a range of tropical climatic conditions in the Queshque valley of the Cordillera Blanca, Peru (9.8°S). This model uses a LiDAR-based digital elevation model (DEM) and hourly meteorological data as inputs to calculate the fully-distributed surface energy and mass balance (SEMB). This approach allows us to better capture the diurnal range of environmental variability at a spatial resolution that has not been achieved with previous paleo-glacier modeling efforts in this region. A 3-D rendition of paleoglaciers was then developed based on a flow model that responds to the SEMB input, accounting for the valley topography. The model was validated by simulating glaciers that match both field and satellite observations of modern glacier area limits, as well as ice thicknesses that are consistent with recently measured ground-penetrating radar (GPR) profiles of the main glacier tongue. After adjusting for changes in early Holocene global radiation values, and using regional paleoclimate records as constraints for the model, the maximum early Holocene ice limit in the valley dating to ∼10.8 (±0.1) ka was reconstructed using a 3.0 °C cooling and a 25% increase in precipitation relative to today. An up-valley ice extent dating to ∼9.4 (±0.3) ka was reconstructed using a 2.8 °C cooling and no change in precipitation amounts relative to today. These results suggest that conditions were cold and wet enough to maintain glaciers at times during the early Holocene, even though a shift to drier conditions combined with modestly warmer temperatures drove a phase of ice retreat from at least ∼10.8 to ∼9.4 ka. These results suggest that southern tropical temperatures and the hydrologic cycle rapidly reorganized during the early Holocene in conjunction with diminishing ice sheets and shifting environmental conditions in the high latitudes.
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影响因子：
2.3
作者：
D. Rodbell;H. Frey;M. Manon;J. Smith;Nicholas A. McTurk
通讯作者：
Nicholas A. McTurk
影响因子：
5.2
作者：
Maussion, F.;Gurgiser, W.;Marzeion, B.
通讯作者：
Marzeion, B.
碎屑沉积物流入安第斯热带湖泊：冰川作用和土壤侵蚀的记录
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
D. Rodbell;Geoffrey O. Seltzer;B. Mark;J. Smith;M. Abbott
通讯作者：
M. Abbott
在空间和时间上追踪热带安第斯冰川：一些教训和跨学科影响
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
B. Mark
通讯作者：
B. Mark
秘鲁安第斯山脉全新世冰川波动表明北部气候联系
影响因子：
56.9
作者：
J. Licciardi;J. Schaefer;J. Taggart;D. Lund
通讯作者：
D. Lund