Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)

Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)
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南美洲最南端(南纬55°)达尔文山脉东北部的全新世冰川历史

DOI:
10.1017/qua.2021.45
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发表时间:
2021
影响因子:
2.3
通讯作者:
Schaefer, Joerg M.
Schaefer, Joerg M.
中科院分区:
地球科学3区
文献类型:
--
作者:
Reynhout, Scott A.;Kaplan, Michael R.;Sagredo, Esteban A.;Aravena, Juan Carlos;Soteres, Rodrigo L.;Schwartz, Roseanne;Schaefer, Joerg M.

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在南美洲最南端的达尔文科迪勒拉,我们利用10Be和14C测年、树木年代学和历史观测重建了达拉维多瓦山谷从去冰期到现在的冰川历史。在达尔文东北部和达拉维多瓦(Dalla Vedova)的约16 ka的冰期消退之后,有证据表明,在约13 ka的冰期推进与南极寒流逆转同时发生。下一个确定年代的冰川扩张发生在870±60历年前(大约公元1150年),随后是在公元1836年前不久至20世纪中期,在树木年代学上受到限制的不太广泛的冰川扩张。我们的记录与达尔文科迪勒拉的大多数研究一致,这些研究表明全新世冰川高峰发生在上个千年。这种模式与巴塔哥尼亚北部早、中全新世冰川的广泛扩张形成鲜明对比;此外,870±60年前的一次推进可能表明,相对于巴塔哥尼亚,达尔文科迪勒拉地区发生了非相冰川推进。我们推测,大约900-800年前,西风带和相关的气候体制向大陆最南端的南移提供了一种机制,通过这种机制,达尔文科迪勒拉的一些冰川在通常被认为是巴塔哥尼亚北部温暖干燥的时期向前移动。
In the Cordillera Darwin, southernmost South America, we used 10Be and 14C dating, dendrochronology, and historical observations to reconstruct the glacial history of the Dalla Vedova valley from deglacial time to the present. After deglacial recession into northeastern Darwin and Dalla Vedova, by ~16 ka, evidence indicates a glacial advance at ~13 ka coeval with the Antarctic Cold Reversal. The next robustly dated glacial expansion occurred at 870 ± 60 calendar yr ago (approximately AD 1150), followed by less-extensive dendrochronologically constrained advances from shortly before AD 1836 to the mid-twentieth century. Our record is consistent with most studies within the Cordillera Darwin that show that the Holocene glacial maximum occurred during the last millennium. This pattern contrasts with the extensive early- and mid-Holocene glacier expansions farther north in Patagonia; furthermore, an advance at 870 ± 60 yr ago may suggest out-of-phase glacial advances occurred within the Cordillera Darwin relative to Patagonia. We speculate that a southward shift of westerlies and associated climate regimes toward the southernmost tip of the continent, about 900–800 yr ago, provides a mechanism by which some glaciers advanced in the Cordillera Darwin during what is generally considered a warm and dry period to the north in Patagonia.
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