Data for: Excess methane in Greenland ice cores associated with high dust concentrations

Results for the measurement of CH4 and the release/production of CH4 from ice core samples used in Lee et al (2018). Two data files are provided: "XS_CH4_20171202.txt" - New measurements of CH4 and excess CH4. Samples are from the GISP2 and NEEM ice cores from Greenland and the WAIS Divide and South Pole (SPICE) ice cores from Antarctica. Data include the primary CH4 concentration measurement (ppb), CH4 concentration after the second melt-refreeze extraction (ppb), the change in concentration (ppb), and the estimated release/production of CH4 during the second melt-refreeze (moles). "GISP2_data.xlsx" - Previously unpublished measurements of CH4 from the GISP2 ice core used in Fig 1 and 2. Age of CH4 samples corresponds to 35-50 ka on the GICC05_modelext gas chronology (Rasmussen et al, 2014). Measurements were made at Oregon State University and at Washington State University - Vancouver. Citation: Lee J. E., Edwards J. S., Schmitt J., Brook E. J., Bock M., Fischer H. (2018) Excess methane in Greenland ice cores associated with high dust concentrations, Geochemica et Cosmochemica Acta. References: James E. Lee, Jon S. Edwards, Jochen Schmitt, Edward J. Brook, Michael Bock, Hubertus Fischer (2018) Excess methane in Greenland ice cores associated with high dust concentrations. Geochemica et Cosmochemica Acta. Baumgartner et al. (2014) NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core. Clim Past 10, 903–920. Brook et al. (2000) On the origin and timing of rapid changes in atmospheric methane during the last glacial period. Global Biogeochem Cy, 14(2), 559-572. Brook et al. (2005) Timing of millennial-scale climate change at Siple Dome, West Antarctica, during the last glacial period. Quaternary Sci Rev, 24, 1333-1343本数据集为Lee等人（2018）研究中所使用冰芯样品的甲烷（CH₄）浓度及其释放/生成量的测量结果。本次共提供两份数据文件： 1. **XS_CH4_20171202.txt**：包含甲烷与过剩甲烷的全新实测数据。样品采自格陵兰的GISP2、NEEM冰芯，以及南极洲的WAIS Divide与南极点（SPICE）冰芯。数据内容涵盖：原始甲烷浓度测量值（单位：ppb）、二次熔-冻萃取后的甲烷浓度（单位：ppb）、浓度变化量（单位：ppb），以及二次熔-冻过程中估算的甲烷释放/生成量（单位：摩尔）。 2. **GISP2_data.xlsx**：包含此前未公开发表的、用于图1与图2的GISP2冰芯甲烷测量数据。甲烷样品的年龄对应GICC05_modelext气体年代标尺（Rasmussen等人，2014）中的35~50 ka区间。测量工作分别在俄勒冈州立大学与华盛顿州立大学温哥华分校完成。 ### 引用格式 Lee J. E.、Edwards J. S.、Schmitt J.、Brook E. J.、Bock M.、Fischer H.（2018）《与高粉尘浓度相关的格陵兰冰芯过剩甲烷》，*Geochemica et Cosmochemica Acta*（地球化学与宇宙化学学报） ### 参考文献 1. James E. Lee、Jon S. Edwards、Jochen Schmitt、Edward J. Brook、Michael Bock、Hubertus Fischer（2018）《与高粉尘浓度相关的格陵兰冰芯过剩甲烷》，*Geochemica et Cosmochemica Acta*（地球化学与宇宙化学学报） 2. Baumgartner et al.（2014）《距今120~10千年的NGRIP冰芯甲烷浓度及其与同芯δ¹⁵N温度重建结果的关联》，*Clim Past*（气候历史），10卷，903–920页 3. Brook et al.（2000）《末次冰期大气甲烷快速变化的起源与时间》，*Global Biogeochem Cy*（全球生物地球化学循环），14(2)，559–572页 4. Brook et al.（2005）《末次冰期西南极洲Siple Dome千年级尺度气候变化的时间》，*Quaternary Sci Rev*（第四纪科学评论），24卷，1333–1343页