The Advanced Global Atmospheric Gases Experiment (AGAGE) Data

In the ALE/GAGE/AGAGE global network program, continuous high frequency gas chromatographic measurements of four biogenic/anthropogenic gases (methane, CH4; nitrous oxide, N2O; hydrogen, H2; and carbon monoxide, CO) and several anthropogenic gases that contribute to stratospheric ozone destruction and/or to the greenhouse effect have been carried out at five globally distributed sites for several years. The program, which began in 1978, is divided into three parts associated with three changes in instrumentation: the Atmospheric Lifetime Experiment (ALE), which used Hewlett Packard HP5840 gas chromatographs; the Global Atmospheric Gases Experiment (GAGE), which used HP5880 gas chromatographs; and the present Advanced GAGE (AGAGE). AGAGE uses two types of instruments: a gas chromatograph with multiple detectors (GC-MD), and a gas chromatograph with mass spectrometric analysis (GC-MS). Beginning in January 2004, an improved cryogenic preconcentration system (Medusa) replaced the absorption-desorption module in the GC-MS systems at Mace Head and Cape Grim; this provided improved capability to measure a broader range of volatile perfluorocarbons with high global warming potentials. The Medusa GC-MS systems were subsequently used at other AGAGE stations (Trinidad Head, Barbados, American Samoa, Zeppelin, Jungfraujoch, and Goan) after the initial setup at Mace Head and Cape Grim. More information may be found at the AGAGE home page: https://agage.mit.edu/instruments. Compared to the previous version (https://data.ess-dive.lbl.gov/datasets/doi: doi:10.15485/1781803), the latest update (Agage_gcmd_gcms.data.2022_01_03.tar.gz) includes 6 months of new data through the end of September 2020. For a complete list of released compounds and used standard scales, please see “AGAGE_scale_2021_v1.pdf” file. Additional information can also be found on the AGAGE website (https://agage.mit.edu).

在ALE/GAGE/AGAGE全球网络计划中，研究团队已在全球5个布控监测站点开展长达数年的连续高频气相色谱检测，针对4种生物源与人为源气体（甲烷CH₄、一氧化二氮N₂O、氢气H₂、一氧化碳CO），以及多种会造成平流层臭氧损耗和/或温室效应的人为源气体进行监测。该计划始于1978年，依据仪器配置的三次迭代调整分为三个子项目：一是大气寿命实验（Atmospheric Lifetime Experiment, ALE），采用惠普（Hewlett Packard）HP5840型气相色谱仪；二是全球大气气体实验（Global Atmospheric Gases Experiment, GAGE），采用惠普HP5880型气相色谱仪；三即当前的先进全球大气气体实验（Advanced GAGE, AGAGE）。AGAGE体系搭载两类仪器：多检测器气相色谱仪（Gas Chromatograph with Multiple Detectors, GC-MD）与质谱分析气相色谱仪（Gas Chromatograph with Mass Spectrometric Analysis, GC-MS）。2004年1月起，位于麦斯海德（Mace Head）与格雷姆角（Cape Grim）的GC-MS系统中，原有的吸收-解吸模块被升级后的低温预浓缩系统（Medusa）替代，该升级显著提升了对更广范围、高全球变暖潜势挥发性全氟化碳的检测能力。在麦斯海德与格雷姆角完成初步部署后，Medusa GC-MS系统后续被应用于其余AGAGE监测站点，包括千里达角（Trinidad Head）、巴巴多斯（Barbados）、美属萨摩亚（American Samoa）、齐柏林站（Zeppelin）、少女峰站（Jungfraujoch）以及果阿站（Goan）。更多相关信息可访问AGAGE官方仪器页面：https://agage.mit.edu/instruments。相较于此前公开版本（https://data.ess-dive.lbl.gov/datasets/doi:10.15485/1781803），本次最新更新数据包（Agage_gcmd_gcms.data.2022_01_03.tar.gz）新增了截至2020年9月的6个月监测数据。如需获取完整的已发布化合物列表及所用标准量表，请参阅"AGAGE_scale_2021_v1.pdf"文件。更多补充信息亦可访问AGAGE官方网站：https://agage.mit.edu。