挪威北部andøya Finncongdalen低北极谷老Dryas和年轻Dryas当地冰川活动的古气候和区域影响

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2023-01-27 DOI:10.1111/bor.12609
Henrik Løseth Jansen, Svein Olaf Dahl, Henriette Linge, Jostein Bakke, Pål Ringkjøb Nielsen, Bjørn Christian Kvisvik
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引用次数: 0

摘要

挪威北部andøya中部一座前冰川的连续冰川边缘和平衡线海拔波动是在晚冰期基于冰碛和AMS 14C年代的沉积物重建的,这些沉积物来自冰川补给的Ner‐Finncongdalsvatnet湖。结果表明,在上一次冰川盛期(21年前),山谷冰川占据了整个山谷 970±620 cal.a BP)。在整个晚冰期早期,冰川一直很大,直到大约14年发生了一次重大的冰川退缩 300±330 cal.a BP。主要进展发生在较老干旱期(OD)和较年轻干旱期(YD),而次要进展则发生在阿勒内冷期和阿勒后期冷却期。此外,据推测,YD内发生了三次较小的冰川退缩/再前进,后者是最大的。晚冰期冰川的重新形成/推进与温度的升高一致,因此被认为是冬季降水增加的结果。将结果与相关冰川和海面温度记录进行比较,风暴路径可能在12 100–11 810±220 cal.a BP。Finnkongdalen当地冰川活动的高时间分辨率提高了我们对Skarpnes(OD)和Tromsø‐Lyngen(YD)再推进期间斯堪的纳维亚冰盖西北部区域冰川波动的气候强迫的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Palaeoclimatic and regional implications of Older Dryas and Younger Dryas local glacier activity in the low-Arctic valley Finnkongdalen, Andøya, northern Norway

Palaeoclimatic and regional implications of Older Dryas and Younger Dryas local glacier activity in the low-Arctic valley Finnkongdalen, Andøya, northern Norway

Continuous glacier margin and equilibrium-line altitude fluctuations of a former glacier on central Andøya, northern Norway, are reconstructed during the Lateglacial based on moraines and AMS 14C-dated sediments from the distal glacier-fed lake Ner-Finnkongdalsvatnet. The results indicate that a valley glacier occupied the entire valley during the Last Glacial Maximum (before 21 970±620 cal. a BP). The glacier remained large throughout the early Lateglacial until a significant glacier retreat took place about 14 300±330 cal. a BP. Major advances occurred during the Older Dryas (OD) and during the Younger Dryas (YD), while minor advances are suggested to have taken place during the Intra Allerød Cold Period and the Late Allerød Cooling. Additionally, three smaller glacier retreats/re-advances within the YD are suggested to have taken place, the latter being the largest. The glacier re-formations/advances during the Lateglacial are consistent with increases in temperature, and they are thus suggested to be the result of increased winter precipitation. Comparing the results with relevant glacier and sea-surface temperature records, a south–north migration of storm tracks may have occurred between 12 100–11 810±220 cal. a BP. The high temporal resolution of local glacier activity in Finnkongdalen improves our understanding of the climate forcing of the regional glacier fluctuations of the northwestern sector of the Scandinavian Ice Sheet during the Skarpnes- (OD) and Tromsø-Lyngen (YD) re-advances.

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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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