High-resolution 10Be concentrations in the NGRIP, EDML and Vostok ice cores and high-resolution dD data in Vostok (5G) during the Laschamp excursion

Using new high resolution 10Be measurements in the NGRIP, EDML and Vostok ice cores, together with previously published data from EDC, we present an improved synchronization between Greenland and Antarctic ice cores during the Laschamp geomagnetic excursion ~ 41 ky ago. We estimate the precision of this synchronization to be ± 20 years, an order of magnitude better than our previous work. We discuss the implications of this new synchronization for making improved estimates of the difference between ice and enclosed gas of the same age (delta depth), difference between age of ice and enclosed gas at the same depth (delta age) in the EDC and EDML ice cores, spectral properties of the 10Be profiles and phasing between Dansgaard/Oeschger-10 (in NGRIP) and AIM-10 (in EDML and EDC).

我们依托在NGRIP、EDML与沃斯托克（Vostok）冰芯中获取的新型高分辨率铍-10（10Be）测量数据，并结合此前已发表的EDC数据，对约4.1万年前拉斯尚普地磁漂移（Laschamp geomagnetic excursion）期间格陵兰与南极冰芯的同步性进行了优化修正。经估算，此次同步修正的精度可达±20年，较此前的研究成果提升了一个数量级。我们还探讨了此次新型同步修正的研究意义，具体包括：优化估算EDC与EDML冰芯中同年龄冰体与包裹气体的深度差（delta depth）、同一深度冰体与包裹气体的年龄差（delta age），铍-10（10Be）剖面的光谱特征，以及格陵兰NGRIP冰芯中的丹斯果-奥什格尔10号事件（Dansgaard/Oeschger-10）与EDML、EDC冰芯中的AIM-10事件之间的相位关系。