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The evolution of the Patagonian Ice Sheet from 35 ka to the present day (PATICE)
Earth-Science Reviews ( IF 12.1 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.earscirev.2020.103152
Bethan J. Davies , Christopher M. Darvill , Harold Lovell , Jacob M. Bendle , Julian A. Dowdeswell , Derek Fabel , Juan-Luis García , Alessa Geiger , Neil F. Glasser , Delia M. Gheorghiu , Stephan Harrison , Andrew S. Hein , Michael R. Kaplan , Julian R.V. Martin , Monika Mendelova , Adrian Palmer , Mauri Pelto , Ángel Rodés , Esteban A. Sagredo , Rachel K. Smedley , John L. Smellie , Varyl R. Thorndycraft

Abstract We present PATICE, a GIS database of Patagonian glacial geomorphology and recalibrated chronological data. PATICE includes 58,823 landforms and 1,669 geochronological ages, and extends from 38°S to 55°S in southern South America. We use these data to generate new empirical reconstructions of the Patagonian Ice Sheet (PIS) and subsequent ice masses and ice-dammed palaeolakes at 35 ka, 30 ka, 25 ka, 20 ka, 15 ka, 13 ka (synchronous with the Antarctic Cold Reversal), 10 ka, 5 ka, 0.2 ka and 2011 AD. At 35 ka, the PIS covered of 492.6 x103 km2, had a sea level equivalent of ~1,496 mm, was 350 km wide and 2090 km long, and was grounded on the Pacific continental shelf edge. Outlet glacier lobes remained topographically confined and the largest generated the suites of subglacial streamlined bedforms characteristic of ice streams. The PIS reached its maximum extent by 33 – 28 ka from 38°S to 48°S, and earlier, around 47 ka from 48°S southwards. Net retreat from maximum positions began by 25 ka, with ice-marginal stabilisation then at 21 – 18 ka, which was then followed by rapid, irreversible deglaciation. By 15 ka, the PIS had separated into disparate ice masses, draining into large ice-dammed lakes along the eastern margin, which strongly influenced rates of recession. Glacial readvances or stabilisations occurred at least at 14 – 13 ka, 11 ka, 6 – 5 ka, 2 – 1 ka, and 0.5 – 0.2 ka. We suggest that 20th century glacial recession (% a-1) is occurring faster than at any time documented during the Holocene.

中文翻译:

巴塔哥尼亚冰盖从 35 ka 到现在的演变 (PATICE)

摘要 我们提出了 PATICE,一个巴塔哥尼亚冰川地貌和重新校准年代数据的 GIS 数据库。PATICE 包括 58,823 个地貌和 1,669 个地质年代,在南美洲南部从 38°S 延伸到 55°S。我们使用这些数据对巴塔哥尼亚冰盖 (PIS) 和随后的冰块和冰坝古湖在 35 ka、30 ka、25 ka、20 ka、15 ka、13 ka(与南极寒冷同步)进行新的经验重建逆转)、10 ka、5 ka、0.2 ka 和 2011 AD。在 35 ka 时,PIS 覆盖 492.6 x103 平方公里,海平面相当于 ~1,496 毫米,宽 350 公里,长 2090 公里,位于太平洋大陆架边缘。出口冰川裂片在地形上仍然受到限制,最大的形成了具有冰流特征的冰下流线型床形套件。从 38°S 到 48°S,PIS 达到最大范围 33 – 28 ka,更早,从 48°S 向南约 47 ka。从最大位置的净撤退开始于 25 ka,然后冰缘稳定在 21 – 18 ka,然后是快速、不可逆转的冰川消退。到 15 ka,PIS 已经分离成不同的冰块,沿着东部边缘流入大型冰坝湖泊,这对衰退速度产生了强烈影响。至少在 14 – 13 ka、11 ka、6 – 5 ka、2 – 1 ka 和 0.5 – 0.2 ka 发生冰川再迁移或稳定。我们认为 20 世纪冰川衰退 (% a-1) 的发生速度比全新世期间记录的任何时间都要快。冰边缘稳定,然后在 21 – 18 ka,然后是快速的,不可逆的冰消期。到 15 ka,PIS 已经分离成不同的冰块,沿着东部边缘流入大型冰坝湖泊,这对衰退速度产生了强烈影响。至少在 14 – 13 ka、11 ka、6 – 5 ka、2 – 1 ka 和 0.5 – 0.2 ka 发生冰川再迁移或稳定。我们认为 20 世纪冰川衰退 (% a-1) 的发生速度比全新世期间记录的任何时间都要快。冰边缘稳定,然后在 21 – 18 ka,然后是快速的,不可逆的冰消期。到 15 ka,PIS 已经分离成不同的冰块,沿着东部边缘流入大型冰坝湖泊,这对衰退速度产生了强烈影响。至少在 14 – 13 ka、11 ka、6 – 5 ka、2 – 1 ka 和 0.5 – 0.2 ka 发生冰川再迁移或稳定。我们认为 20 世纪冰川衰退 (% a-1) 的发生速度比全新世期间记录的任何时间都要快。6 – 5 ka、2 – 1 ka 和 0.5 – 0.2 ka。我们认为 20 世纪冰川衰退 (% a-1) 的发生速度比全新世期间记录的任何时间都要快。6 – 5 ka、2 – 1 ka 和 0.5 – 0.2 ka。我们认为 20 世纪冰川衰退 (% a-1) 的发生速度比全新世期间记录的任何时间都要快。
更新日期:2020-05-01
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