Jordan N. Herbert , Gordon R.M. Bromley , Meredith A. Kelly , Alice M. Doughty , Daniel Ruiz-Carrascal , Sergio A. Restrepo-Moreno , Santiago Noriega Londoño , Peter Galloway , Alan J. Hidy
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Nonetheless, there remains a persistent gap in our understanding of how the tropics influenced – or were influenced by – the high-magnitude climate shifts of the Late Pleistocene, and whether this high-energy region simply responded to extratropical forcing or was itself a driver of global climatic change. To help address this knowledge gap, we analyzed geologic evidence for past glacial fluctuations in three adjacent valleys in the Sierra Nevada del Cocuy, the highest subrange of the Eastern Cordillera in the Colombian Andes, to provide a terrestrial record of atmospheric temperature during the latter part of Termination 1. Coupled with geomorphic mapping and paleo-snowline reconstructions, our beryllium-10 glacial chronology indicates that glaciers in the humid inner tropics underwent pronounced growth and gradual decay during the Antarctic Cold Reversal (14.5–12.8 ka) and Younger Dryas (12.8–11.7 ka) periods, respectively, following a trend that, according to directly dated moraine records from throughout both polar hemispheres, appears to have been global. While the specific mechanism(s) behind this large-scale behavior remains to be corroborated, we revisit the hypothesis that ocean-atmosphere heat transfer and water vapor flux are key drivers of abrupt Lateglacial temperature fluctuations. Subsequent to the Lateglacial, deglaciation of the Sierra Nevada del Cocuy accelerated during the Early Holocene, a pattern also observed in other tropical glacier records. More recently, the magnitude of snowline rise and glacier retreat over the last two centuries supports the view that modern tropospheric warming is anomalously strong at least relative to the last ∼16,000 years.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"363 ","pages":"Article 109458"},"PeriodicalIF":3.3000,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Paleoclimatic implications of glacial fluctuations in the Sierra Nevada del Cocuy, northern Andes, Colombia, during the Lateglacial and Holocene\",\"authors\":\"Jordan N. Herbert , Gordon R.M. Bromley , Meredith A. Kelly , Alice M. Doughty , Daniel Ruiz-Carrascal , Sergio A. Restrepo-Moreno , Santiago Noriega Londoño , Peter Galloway , Alan J. 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While the specific mechanism(s) behind this large-scale behavior remains to be corroborated, we revisit the hypothesis that ocean-atmosphere heat transfer and water vapor flux are key drivers of abrupt Lateglacial temperature fluctuations. Subsequent to the Lateglacial, deglaciation of the Sierra Nevada del Cocuy accelerated during the Early Holocene, a pattern also observed in other tropical glacier records. 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引用次数: 0
摘要
通过地貌测绘和宇宙成因核素地表暴露年代重建前山地冰川,为推断过去陆地气候变化的模式提供了独特的机会。热带山地冰川特别有价值,因为相对于高纬度地区,赤道纬度地区的陆地气候代用物相对较少。作为地球上最大的单一气候带,热带通过潜热和水汽的海洋-大气转移在调节全球气候方面发挥着巨大的作用。尽管如此,对于热带地区是如何影响或受到晚更新世高强度气候变化的影响,以及这个高能量地区是仅仅对温带强迫作出反应,还是本身就是全球气候变化的驱动因素,我们的理解仍然存在持续的差距。为了帮助解决这一知识缺口,我们分析了内华达山脉(Sierra Nevada del Cocuy)三个相邻山谷过去冰川波动的地质证据,这是哥伦比亚安第斯山脉东科迪勒拉山脉的最高分支,提供了终止1后期大气温度的陆地记录。结合地貌制图和古雪线重建,我们的beryl10冰川年代学表明,在南极寒流逆转(14.5-12.8 ka)和新仙女木期(12.8-11.7 ka)期间,湿润热带内陆地区的冰川分别经历了明显的生长和逐渐衰减,根据来自两极半球的直接定年冰碛记录,这一趋势似乎是全球性的。虽然这种大规模行为背后的具体机制仍有待证实,但我们重新审视了海洋-大气传热和水蒸气通量是冰川温度突变的关键驱动因素的假设。在冰川期之后,内华达山脉的冰川消融在全新世早期加速,在其他热带冰川记录中也观察到这种模式。最近,过去两个世纪雪线上升和冰川退缩的幅度支持了这样一种观点,即现代对流层变暖至少相对于过去~ 16000年异常强烈。
Paleoclimatic implications of glacial fluctuations in the Sierra Nevada del Cocuy, northern Andes, Colombia, during the Lateglacial and Holocene
The reconstruction of former mountain glaciers from geomorphic mapping and cosmogenic-nuclide surface-exposure dating provides a unique opportunity to infer patterns of past terrestrial climate variability. Tropical mountain glaciers are particularly valuable as there are comparatively few terrestrial climate proxies at equatorial latitudes relative to higher latitudes. As the single largest climate zone on Earth, the tropics play an outsized role in mediating global climate via the ocean-atmosphere transfer of latent heat and water vapor. Nonetheless, there remains a persistent gap in our understanding of how the tropics influenced – or were influenced by – the high-magnitude climate shifts of the Late Pleistocene, and whether this high-energy region simply responded to extratropical forcing or was itself a driver of global climatic change. To help address this knowledge gap, we analyzed geologic evidence for past glacial fluctuations in three adjacent valleys in the Sierra Nevada del Cocuy, the highest subrange of the Eastern Cordillera in the Colombian Andes, to provide a terrestrial record of atmospheric temperature during the latter part of Termination 1. Coupled with geomorphic mapping and paleo-snowline reconstructions, our beryllium-10 glacial chronology indicates that glaciers in the humid inner tropics underwent pronounced growth and gradual decay during the Antarctic Cold Reversal (14.5–12.8 ka) and Younger Dryas (12.8–11.7 ka) periods, respectively, following a trend that, according to directly dated moraine records from throughout both polar hemispheres, appears to have been global. While the specific mechanism(s) behind this large-scale behavior remains to be corroborated, we revisit the hypothesis that ocean-atmosphere heat transfer and water vapor flux are key drivers of abrupt Lateglacial temperature fluctuations. Subsequent to the Lateglacial, deglaciation of the Sierra Nevada del Cocuy accelerated during the Early Holocene, a pattern also observed in other tropical glacier records. More recently, the magnitude of snowline rise and glacier retreat over the last two centuries supports the view that modern tropospheric warming is anomalously strong at least relative to the last ∼16,000 years.
期刊介绍:
Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.