Dome Fuji Ice Core 264KYr Dry Extraction CO2 Data

CO2 record from the Dome Fuji ice core (Antarctica) covering the last 260 kyr with relatively low resolution. Air was extracted by a dry method and measured with a gas chromatograph. Gravitational enrichment of CO2 in firn is corrected by d15N data measured on the same samples. Analytical precision (including air extraction and measurement) is 1.5 ppm (one standard deviation). Note that the data for ~30-55 kyr b2k are too low by up to 20 ppmv because of fractionation between air bubbles and clathrate hydrates. Age scale is DFO-2006 from Kawamura et al. (2007, Nature). Note that age is given in b2k (before AD 2000). See original reference for further details. See also Dome Fuji CO2 data (1-338 kyr b2k) measured with wet extraction method.本数据集为南极富士冰穹（Dome Fuji）冰芯的二氧化碳（CO₂）记录，覆盖过去260千年（kyr），分辨率相对偏低。气体样品采用干法提取，通过气相色谱仪完成检测。利用同一样品测得的δ¹⁵N（氮15同位素比值）数据，对粒雪层中二氧化碳的重力富集效应进行了校正。分析精度（涵盖气体提取与检测全流程）为1.5 ppm（1倍标准差）。需注意：约30~55千年（kyr）b2k时段的数据因气泡与笼形水合物间的分馏作用，存在最高达20ppmv的偏低偏差。年代标尺采用Kawamura等人2007年发表于《自然》（Nature）的DFO-2006标尺。需注意：年代以b2k（即公元2000年之前）为基准给出。详细信息请参阅原始参考文献。另可参阅采用湿法提取方法获取的富士冰穹二氧化碳数据（覆盖1~338千年（kyr）b2k时段）。