Late glacial and Holocene climate variability, southernmost Patagonia
Late glacial and Holocene climate variability, southernmost Patagonia
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晚冰期和全新世气候变化，最南端的巴塔哥尼亚
DOI：
10.1016/j.quascirev.2019.106131
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发表时间：
2020
影响因子：
4
通讯作者：
J. Torres
中科院分区：
文献类型：
--
作者：
R. McCulloch;J. Blaikie;Bárbara G. Jacob;C. Mansilla;Flavia Morello;R. Pol;M. S. Román;E. Tisdall;J. Torres
在巴塔哥尼亚最南端纳瓦里诺岛（Isla Navarino）上的蓬塔伯斯勒姆（54°54′S，67°57′W）附近的泥炭沼泽中，一份晚冰期-全新世的古生态记录，受到可靠年代学的限制，记录了这些高纬度地区南西风（SWW）强度和焦点的变化。这种长期的记录需要重建和更好地了解可能的区域影响的极移和加强的SWW预测下全球变暖的情景。蓬塔伯斯勒姆的冰川消退发生在c. 17，000 calaBP，冰后期景观以耐寒先锋种为主，假山毛榉林是由c. 12，250 cal a BP，这种水分敏感的植被类型在全新世早期至中期从c. 9700至7050卡BP反映了与西南偏西长期向极地收缩相关的强烈且持续的干燥阶段。在c之后。6000 cal a BP，气候有变冷变湿的区域趋势。然而，我们确定了至少五个时期的快速气候变化（RCC）导致巴塔哥尼亚南端的干燥条件：c。5350-4750 cal a BP，c. 4300 -3300 cal a BP，c. 2600-1850 cal a BP，c. 1350-1100 cal a BP和c.血压550-350卡。综合我们的纳瓦里诺岛记录和纬度分布（34°-64 ° S）的多代理记录，我们提出，这些时期的RCC和相对干燥的条件表明，纬度变化的位置和强度的SWW响应气候变暖，导致降水减少在巴塔哥尼亚南部边缘。
A Late glacial – Holocene palaeoecological record, constrained by a robust chronology, from a peat bog near Punta Burslem (54°54′S, 67°57′W) on Isla Navarino, southernmost Patagonia documents the shifts in intensity and focus of the Southern Westerly Winds (SWWs) at these high latitudes. Such long-term records are required to reconstruct and better understand the likely regional impacts of a poleward shift and intensification of the SWWs predicted under global warming scenarios. Deglaciation at Punta Burslem occurs sometime before c. 17,000 cal a BP, and the post glacial landscape is dominated by cold tolerant pioneer species.Nothofaguswoodland is established by c. 12,250 cal a BP, this moisture sensitive vegetation type retreats in the early to mid-Holocene from c. 9700 to 7050 cal a BP reflecting an intense and sustained drier phase associated with a prolonged poleward contraction of the SWWs. After c. 6000 cal a BP there is a regional trend to cooler and wetter climate. However, we identify at least five periods of rapid climate change (RCC) leading to drier conditions at this southern extreme of Patagonia: c. 5350-4750 cal a BP, c.4300-3300 cal a BP, c. 2600-1850 cal a BP, c. 1350-1100 cal a BP and c. 550-350 cal a BP. From a synthesis of our Isla Navarino records and a latitudinal spread (34°-64°S) of multiproxy records it is proposed that these periods of RCC and relatively drier conditions indicate latitudinal shifts in the location and intensity of the SWWs in response to climatic warming leading to reduced precipitation at the southern margins of Patagonia.
影响因子：
4
作者：
B. Zolitschka;F. Anselmetti;D. Arizteguí;H. Corbella;P. Francus;A. Lücke;N. Maidana;C. Ohlendorf;F. Schäbitz;S. Wastegård
通讯作者：
B. Zolitschka;F. Anselmetti;D. Arizteguí;H. Corbella;P. Francus;A. Lücke;N. Maidana;C. Ohlendorf;F. Schäbitz;S. Wastegård
影响因子：
18.3
作者：
Lamy, Frank;Kilian, Rolf;Steinke, Tatjana
通讯作者：
Steinke, Tatjana