西伯利亚高原千年尺度的波动对全新世风化活动的影响:中亚干旱地区艾利克湖的启示

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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引用次数: 0

摘要

中亚干旱地区(ACA)是北半球主要的沙尘源地区,其普遍存在的风化活动严重影响了该地区的生态环境和人类福祉。然而,全新世期间中亚地区风化活动的驱动机制尚不清楚,因此很难预测未来可能出现的风化活动。我们利用 AMS 14C 测定法,结合粒度分析、高分辨率 X 射线荧光扫描和扫描电子显微镜,对准噶尔盆地艾利克湖的沉积物岩芯进行了研究,重建了全新世期间阿拉斯加地区的风化活动历史。我们发现,在千年尺度上,风化活动增加的时期与西伯利亚高原的增强相关,而且风化活动与欧洲中纬度地区的气候波动之间存在一致性。这些发现证明了北半球中纬度和高纬度地区气候波动之间的密切关系。高纬度地区较低/较高的气温会导致极地气团的扩张/收缩,从而导致西伯利亚高原的增强/减弱。此外,在全新世期间,ACA地区更频繁/更不频繁的风化活动与欧洲中纬度地区的降温/升温趋势相对应。虽然全球持续变暖可能会导致阿拉斯加-西伯利亚高原的风化活动长期减少,但极地涡旋的减弱导致近年来欧亚大陆中纬度地区冬季寒潮影响更加频繁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of millennial-scale fluctuations of the Siberian High on Holocene aeolian activity: Insights from Lake Ailike in arid Central Asia
Arid Central Asia (ACA) is a major dust source region in the Northern Hemisphere, owing to the prevalence of aeolian activity that substantially impacts the ecological environment and human wellbeing in this region. However, the driving mechanisms of aeolian activity in ACA during the Holocene are unclear, making it difficult to predict possible future aeolian activity. We used AMS 14C dating, combined with grain-size analysis, high-resolution X-ray fluorescence scanning, and scanning electron microscopy of a sediment core from Lake Ailike, in the Junggar Basin, to reconstruct the history of aeolian activity in ACA during the Holocene. We found that periods of increased aeolian activity on the millennial-scale are correlated with the strengthening of the Siberian High, and that there is a consistency between aeolian activity and climatic fluctuations in the mid-latitudes of Europe. These findings support a close relationship between climate fluctuations in mid- and high-latitude regions of the Northern Hemisphere. Lower/higher temperatures in high latitudes result in the expansion/contraction of polar air masses, leading to the strengthening/weakening of the Siberian High. Additionally, more/less frequent aeolian activity in ACA corresponded to cooling/warming trends in the mid-latitudes of Europe during the Holocene. While ongoing global warming may lead to a long-term decrease in aeolian activity in ACA, the weakening of the polar vortex has resulted in more frequent cold waves affecting the mid-latitudes of Eurasia during winter in recent years.
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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