Scripps O2 Program Data

This archive presents time-series measurements of atmospheric O2/N2 ratio and CO2 mole fraction from flask samples collected by the Scripps O2 program at twelve fixed land stations. Ten of these stations form an active network from nearly Pole to Pole along a Pacific transect. The earliest results in this network (from La Jolla) date from 1989. The remaining two stations are “legacy stations”, where flasks are no longer collected. Flasks are collected under atmospheric conditions designed to minimize the impact of any local process such as fuel burning that might impact atmospheric O2 or CO2. The sampling frequency is typically ~ 2 weeks. The O2/N2 ratio is reported as relative deviation from reference in δ units: δ = ((O2/N2)_samp /(O2/N2)_ref ) – 1, where (O2/N2)_samp is the O2/N2 mole ratio of the sample, (O2/N2)_ref is the ratio of a long-term reference. The quantity δ is multiplied by 10^6 and expressed in “per meg” units. Changes in CO2 are reported in “ppm” units, i.e. µmol CO2 per mole of H2O -free air. The Scripps O2 program has been directed throughout its history by Prof. Ralph Keeling. The program began while R. Keeling was a postdoc at the National Center for Atmospheric Research in Boulder, Colorado, and was moved to the Scripps Institution of Oceanography in 1993. The O2/N2 measurements are made on a custom interferometric analyzer, while the CO2 data use a Siemens non-dispersive infrared analyzer. Sampling, analysis, and calibration methods are described in Keeling et al (2007) and Keeling et al (1998). The Scripps O2 program is operationally independent from the Scripps CO2 program in using different flasks and analysis systems. The CO2 records of these two programs are therefore substantially independent, even though the flasks for both programs are collected at many of the same stations.

本数据集归档了斯克里普斯氧气项目（Scripps O2 Program）在12个固定陆地站点采集的烧瓶样品所得到的大气O₂/N₂比值与CO₂摩尔分数的时间序列测量数据。其中10个站点组成了一条沿太平洋断面、近乎覆盖两极的活跃监测网络，该网络的最早观测数据（来自拉霍亚站点）可追溯至1989年。剩余2个站点为“遗留站点”，目前已不再采集烧瓶样品。

样品采集会选取受本地过程（如燃料燃烧）干扰最小的大气环境，以规避此类过程对大气O₂或CO₂测定结果的影响。采样频率通常约为每两周一次。

O₂/N₂比值以δ单位表示其相对于参考值的相对偏差，计算公式为δ = ((O₂/N₂)_样本 / (O₂/N₂)_参考) – 1，其中(O₂/N₂)_样本为样品的O₂/N₂摩尔比，(O₂/N₂)_参考为长期参考标准的比值。将δ值乘以10^6后，以“per meg（百万分偏差单位）”为单位表示。CO₂变化量以“ppm（体积百万分比）”为单位报告，即每摩尔无水汽空气中所含CO₂的微摩尔数。

斯克里普斯氧气项目自创立以来始终由拉尔夫·基林（Ralph Keeling）教授主导。该项目创立之初，R·基林仍为科罗拉多州博尔德市美国国家大气研究中心（National Center for Atmospheric Research）的博士后研究员，并于1993年迁至斯克里普斯海洋研究所。O₂/N₂比值的测定采用定制化干涉分析仪，而CO₂数据则使用西门子（Siemens）非色散红外分析仪。

采样、分析与校准方法详见基林等人2007年与1998年的研究文献。斯克里普斯氧气项目与斯克里普斯CO₂项目在业务上相互独立，二者采用不同的烧瓶样品与分析系统。尽管两个项目的样品烧瓶在多数相同站点采集，但二者的CO₂记录仍具有高度独立性。