GISP2 (B and D Core) Methane Concentrations

The data include methane data from the Greenland Ice Sheet Project 2 (GISP2) B & D Cores. Gas ages were calculated according to the methods described in Brook et al. 1996, and are subject to change. Ice ages were calculated by by linear interpolation from the Meese et al. timescale.本数据集包含格陵兰冰盖计划2号（Greenland Ice Sheet Project 2, GISP2）B孔与D孔冰芯的甲烷数据。气体年代依据Brook等（1996）所述方法计算所得，且存在修订可能。冰期年代则以Meese等人提出的年代标尺为基础，通过线性插值法计算获得。