Ambient atmospheric methane observations from the ICOS/InGOS network 2000-2013

This dataset for historic ambient CH4 mole fractions is an important outcome of the FP7 InGOS project (http://www.ingos-infrastructure.eu, Grant Agreement Number 284274). Data from 20 stations have been reprocessed for the period 2000-2013; in some cases involving re-integration of chromatograms and in all cases recalibrating the time series using updated assigned values for standard gases and target gases, All data have been brought to the same concentration scale (NOAA 2004). Data have been flagged for identified periods with instrumental or sampling problems. Next to added estimations for measurement uncertainty based on repeatibility of the working standards also error estimates are added that represent uncertainty due to lab internal scale consistency, monthly reproducibility, scale transfer and where available comparison with concurrent flask sampling. More documentation can be found on https://ingos-atm.lsce.ipsl.fr/doc

本数据集收录历史大气环境甲烷（CH4）摩尔分数数据，是欧盟第七框架计划（FP7）InGOS项目（http://www.ingos-infrastructure.eu，资助协议编号284274）的重要成果之一。针对2000-2013年时段的20个观测站数据完成了重新处理：部分站点数据需完成色谱图的重新积分，所有站点数据均基于标准气体与目标气体的更新赋值对时间序列进行了重新校准。所有数据均统一至NOAA 2004浓度标度。已针对已识别出存在仪器故障或采样问题的时段对数据进行了标记。除基于工作标准重复性得到的测量不确定度估算值外，本数据集还补充了多类误差估算值，涵盖实验室内部标尺一致性、月度复现性、标尺传递带来的不确定度，以及在有可用数据时通过同步气瓶采样对比得到的不确定度。更多相关文档可访问https://ingos-atm.lsce.ipsl.fr/doc获取。