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Late Holocene glacier variations indicated by theδ18O of ice core enclosed gaseous oxygen in the central Tibetan Plateau

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Journal of Mountain Science 2023年第2期20卷 325-337页

作者： LI Jiu-le XU Bai-qing WANG Ning-lian YAO Ping XU Xiang-ke Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China College of Urban and Environmental Sciences Northwest UniversityXi’an710069China

Theδ18O of ice core enclosed gaseous oxygen(δ18Obub)has been widely used for climate reconstruction in polar ***,less is known about its climatic implication in the mountainous glaciers as the lack of continuous ***,we present a long-term,continuousδ18Obub record from the Tanggula glacier in the central Tibetan Plateau(TP).Based on comparisons of its variation with regional climate and glacier changes,we found that there was a good correlation between the variation of theδ18Obub in this alpine ice core and the accumulation and melting of this *** more developed the firn layer on glacier surface,the more positive theδ***,the more intense the glacier melting,the more negative theδ*** with the chronology of ice core enclosed gases,the glacier variations since the late Holocene in the central TP were *** result showed that there were four accumulation and three deficit periods of glaciers in this *** strongest glacier accumulation period was 1610-300 B.C.,which corresponds to the *** most significant melting period was the last 100 years,which corresponds to the recent global *** Medieval Warm Period was relatively significant in the central ***,during the Little Ice Age,there was no significant glacier accumulation in the central TP,and even short deficit events *** of the late Holocene glacier variation in the central TP with glacier and climate variations in the TP and the Northern Hemisphere showed that it was closely related to the North Atlantic Oscillation.

关键词： Ice core air bubble Stable isotope ratio Gaseous oxygen glacier variation Late Holocene Tibetan Plateau

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glacier Changes at Svartisen,Northern Norway,during the Last 125 Years:Influence of Climate and Other Factors

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Journal of Earth Science 2010年第2期21卷 123-136页

作者： Wilfred H Theakstone School of Environment and Development University of Manchester

The two ice caps of Svartisen, at the latitude of the Arctic Circle in Norway, supply 60 glaciers, ranging in size from 〉50 to 〈1 km^2. Until the last two decades of the 19th century, the glaciers remained close to their maximum recent （Little Ice Age） size. In response to the prevailing 20th century climate, they have become smaller, but the changes have varied between glaciers. Climatic factors have not been the sole control of the variations. The response times of small, steep glaciers are shorter than those of the longer, more gently sloping outlet glaciers. Topographic factors may moderate the response of individual glaciers to climate. The 20th century mass balance of several of the larger glaciers was dominated by calving into marginal lakes. The mass balance of Engabreen, the largest outlet of the western ice cap, has been measured every year since 1970 and the cumulative balance to 2008 was a gain of 22.7 m water equivalent. Although the pattern of annual variations probably applies to the other glaciers of Svartisen, it does not indicate their actual changes （gain or loss）. Thus, the Engabreen record is of little utility in water resource planning for the whole area.

关键词： Svartisen climatic change glacier variation calving mass balance.

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