Western Siberia experienced rapid shifts in moisture source and summer water balance during the last deglaciation and early Holocene

Western Siberia experienced rapid shifts in moisture source and summer water balance during the last deglaciation and early Holocene
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在末次冰消期和全新世早期,西西伯利亚经历了水分来源和夏季水平衡的快速变化

DOI:
10.1002/jqs.3386
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发表时间:
2021
影响因子:
2.3
通讯作者:
Brendryen, Jo
Brendryen, Jo
中科院分区:
地球科学3区
文献类型:
--
作者:
Cowling, Owen C.;Thomas, Elizabeth K.;Svendsen, John Inge;Mangerud, Jan;Haflidason, Haflidi;Regnéll, Carl;Brendryen, Jo

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俄罗斯北极是一个广阔的地区,与其他陆地北极地区相比,长期的古气候重建相对较少。我们使用Bolshoye Shchuchye湖的正烷酸氢同位素对极地乌拉尔山脉24000年的气候进行了重建。北大西洋末次冰消期的主要气候变化都出现在这一记录中,包括与Bølling-Allerød、新仙女木和全新世有关的过渡。然而,大舒切耶最后一次冰消期同位素变化的幅度相对于北大西洋来说很小,并且与从10.5k cal开始的2 H富集值的变化相比相形见绌,这在大多数其他记录中不存在。最后一次冰消期的变化可能是由于当地温度的变化,巴伦支海和喀拉海的海冰覆盖,以及影响蒸腾作用的植物群落变化。从10.5千卡开始的富集可能记录了向现代气候条件的转变,这是由斯堪的纳维亚冰盖的消失,来自巴伦支海和喀拉海的当地来源的水分增加以及向北的树木迁移导致蒸腾作用增强造成的。未来的变暖可能会增加该地区的夏季降水,改变当地的生态系统和碳循环。
The Russian Arctic is an extensive region, with relatively few long‐duration paleoclimate reconstructions compared to other terrestrial Arctic regions. We present a 24 000‐year reconstruction of climate in the Polar Ural Mountains usingn‐alkanoic acid hydrogen isotopes from Lake Bolshoye Shchuchye. Major last deglaciation climate changes in the North Atlantic are present in this record, including transitions associated with the Bølling–Allerød, Younger Dryas and Holocene. However, the magnitude of the last deglaciation isotopic shifts at Bolshoye Shchuchye are small relative to the North Atlantic, and are dwarfed by a shift to2H‐enriched values starting at 10.5k cal abpat this site that is not present in most other records. The last deglaciation changes may be due to variations in local temperature, sea ice cover in the Barents and Kara seas, and plant community shifts impacting transpiration. The enrichment starting at 10.5‐k cal abpprobably records a shift towards modern climate conditions, caused by the loss of the Scandinavian Ice Sheet, increased locally sourced moisture from the Barents and Kara seas, and northward treeline migration causing enhanced transpiration. Future warming may increase summer precipitation in this region, with changes to local ecosystems and carbon cycling.
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