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引用次数: 0
摘要
海洋同位素阶段(MIS)5c 介于距今约 106 000 年至约 93 000 年之间,是一个重要的暖期,在这一时期,可以对当前的人为变暖进行分析。尽管这一时期被视为一个明显的间歇期,但其气候表现却因地区而异,地球上的不同地区都显示出比现代更冷或更暖的条件。因此,必须将温度重建扩展到地球上的不同地区,以更好地了解 MIS 5c 期间的气候动态。在阿拉斯加,MIS 5c 没有定量的温度重建,限制了我们对这一气候敏感的高纬度地区温度变化的了解。在这里,我们利用精确测定年代的岩浆中流体包裹体的氢同位素,首次对阿拉斯加 MIS 5c 期间的温度进行了定量估算,从而填补了这一空白。我们发现,MIS 5c 期间的地区温度与现代参照期(公元 1929-1989 年)的温度误差不大,这可能代表了地区温度与现代一样高的最近时期。
A temperature snapshot from MIS 5c in southeastern Alaska
Marine Isotope Stage (MIS) 5c, between ~106 000 and ~93 000 years ago, represents an important warm period in which the current anthropogenic warming can be contextualized. Although viewed as a pronounced interstadial, its climate expression is regionally disparate, with different regions on Earth showing evidence of either cooler or warmer conditions than modern-day. It is therefore important to expand temperature reconstructions to different regions on Earth to gain a better picture of climate dynamics during MIS 5c. In Alaska, there are no quantitative temperature reconstructions for MIS 5c, limiting our knowledge of temperature changes in this climatically sensitive high-latitude region. Here, we fill this gap by providing the first quantitative temperature estimates from MIS 5c in Alaska using hydrogen isotopes of fluid inclusions in precisely dated speleothems. We find that regional temperatures during MIS 5c were within error of the modern-day reference period (1929–1989 ce) temperatures, possibly representing the most recent time period that regional temperatures were as high as modern-day.
期刊介绍:
The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.