The last Eurasian ice sheets - a chronological database and time-slice reconstruction, DATED-1
The last Eurasian ice sheets - a chronological database and time-slice reconstruction, DATED-1
复制标题
DOI：
10.1111/bor.12142
复制
发表时间：
2016-01-01
期刊：
影响因子：
2.2
通讯作者：
Svendsen, John Inge
中科院分区：
文献类型：
--
作者：
Hughes, Anna L. C.;Gyllencreutz, Richard;Svendsen, John Inge
我们提出了欧亚冰盖（英国-爱尔兰冰盖、斯瓦尔巴-巴伦支海-喀拉海和斯堪的纳维亚冰盖）的新时间切片重建，记录了这些相互关联的冰盖每 1000 年从 25 到 10 ka 以及在 40 ka 之前的四个选定时间段的空间演化。冰盖范围的时间切片图基于新的地理信息系统（GIS）数据库，我们在该数据库中收集了限制冰盖前进和后退时间的已发布数字数据，以及现有文献中包含的地貌和地质证据。我们将所有不确定性估计整合到每个时间片的三个冰缘线中；一条最可信的线，源自我们对所有可用证据的评估，并具有现有数据允许的最大和最小限度。这种方法的动机是冰川学、均衡和气候模型的需求，并清楚地显示知识的局限性。在整个冰原区域，前进和后退的时间在空间上都有显着的变化。根据我们的汇编，英国-爱尔兰和挪威大陆架的最西端界限（大约2726ka）比俄罗斯平原的东端界限（大约20-19ka）早了7000年。欧亚冰盖复合体作为一个整体在 c 达到其最大范围（5.5 Mkm(2)）和体积（类似于 24 m 海平面当量）。 21 ka。我们的大陆尺度方法强调了冰盖年代学中相互矛盾的证据和差距的实例，其中不确定性仍然很大，应该成为未来研究的重点。最大的不确定性与目前低于海平面且存在矛盾证据的地点一致。第一个版本的数据库和时间片 (DATED-1) 的普查日期为 2013 年 1 月 1 日，两者均可通过 Bjerknes 气候数据中心和 PANGEA 下载（www.bcdc.no；http://doi.pangaea.de/10.1594/PANGAEA.848117）。
We present a new time-slice reconstruction of the Eurasian ice sheets (British-Irish, Svalbard-Barents-Kara Seas and Scandinavian) documenting the spatial evolution of these interconnected ice sheets every 1000 years from 25 to 10 ka, and at four selected time periods back to 40 ka. The time-slice maps of ice-sheet extent are based on a new Geographical Information System (GIS) database, where we have collected published numerical dates constraining the timing of ice-sheet advance and retreat, and additionally geomorphological and geological evidence contained within the existing literature. We integrate all uncertainty estimates into three ice-margin lines for each time-slice; a most-credible line, derived from our assessment of all available evidence, with bounding maximum and minimum limits allowed by existing data. This approach was motivated by the demands of glaciological, isostatic and climate modelling and to clearly display limitations in knowledge. The timing of advance and retreat were both remarkably spatially variable across the ice-sheet area. According to our compilation the westernmost limit along the British-Irish and Norwegian continental shelf was reached up to 7000 years earlier (at c. 2726 ka) than the eastern limit on the Russian Plain (at c. 20-19 ka). The Eurasian ice sheet complex as a whole attained its maximum extent (5.5 Mkm(2)) and volume (similar to 24 m Sea Level Equivalent) at c. 21 ka. Our continental-scale approach highlights instances of conflicting evidence and gaps in the ice-sheet chronology where uncertainties remain large and should be a focus for future research. Largest uncertainties coincide with locations presently below sea level and where contradicting evidence exists. This first version of the database and time-slices (DATED-1) has a census date of 1 January 2013 and both are available to download via the Bjerknes Climate Data Centre and PANGAEA (www.bcdc.no; http://doi.pangaea.de/10.1594/PANGAEA.848117).