Early last glacial intra-interstadial climate variability recorded in a Sardinian speleothem
Early last glacial intra-interstadial climate variability recorded in a Sardinian speleothem
复制标题
DOI：
10.1016/j.quascirev.2017.05.007
复制
发表时间：
2017-08
影响因子：
4
通讯作者：
A. Columbu;R. Drysdale;E. Capron;J. Woodhead;J. Waele;L. Sanna;J. Hellstrom;P. Bajo
中科院分区：
文献类型：
--
作者：
A. Columbu;R. Drysdale;E. Capron;J. Woodhead;J. Waele;L. Sanna;J. Hellstrom;P. Bajo
末次冰期早期撒丁岛石笋的化学和物理代用资料揭示了一个以112.0+0.52/-0.59ka为中心的亚千年尺度的冷干气候事件，随后在111.76+0.43/-0.45ka迅速恢复到暖湿气候。与区域洞穴沉积记录和NGRIP冰芯（格陵兰）的古温度代理记录的比较表明，该事件对应于格陵兰Interstadial（GI）25 b和25 a，根据最近的格陵兰地层框架，GI-25内的interstadial气候振荡。根据GICC 05 modelext冰川年代学，洞穴沉积物的年龄与格陵兰岛相应事件的年龄相当一致（在0.8 kyr以内），但比根据AICC 2012年代学的格陵兰岛年龄大约3.7 kyr。
Chemical and physical proxy data from a precisely dated early last glacial (∼113–110 ka, MIS5d) Sardinian stalagmite reveal a sub-millennial-scale, cool-dry climate event centered at 112.0+0.52/-0.59ka, followed by a rapid return to warm-wet conditions at 111.76+0.43/-0.45ka. Comparison with regional speleothem records and the palaeotemperature proxy record from the NGRIP ice core (Greenland) suggests that this event corresponds to Greenland Interstadial (GI) 25b and 25a, an intra-interstadial climate oscillation within GI-25, according to the recent Greenland stratigraphic framework. The speleothem age is in reasonable agreement (within 0.8 kyr) with that of the corresponding event in Greenland based on the GICC05modelext ice chronology but is older by about 3.7 kyr than the Greenland age based on the AICC2012 chronology.