History of chemically and radiatively important atmospheric gases from the Advanced Global Atmospheric Gases Experiment (AGAGE)

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, H; 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. More information may be found at the AGAGE home page: https://agage.mit.edu/instruments. To access the older version of AGAGE data package see: http://cdiac.ess-dive.lbl.gov/ndps/alegage.html

在ALE/GAGE/AGAGE全球网络计划中，研究人员已在全球5个分布监测站点持续开展多年高频气相色谱监测，检测对象涵盖4种生物源与人为源气体（甲烷CH₄、一氧化二氮N₂O、氢气H、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。
该计划于1978年启动，根据检测仪器的三次迭代升级分为三个子项目：分别为使用惠普（Hewlett Packard, HP）HP5840气相色谱仪的大气寿命实验（Atmospheric Lifetime Experiment, ALE）、使用HP5880气相色谱仪的全球大气气体实验（Global Atmospheric Gases Experiment, GAGE），以及当前的进阶全球大气气体实验（Advanced GAGE, AGAGE）。AGAGE采用两类仪器：搭载多检测器的气相色谱仪（gas chromatograph with multiple detectors, GC-MD），以及搭载质谱分析模块的气相色谱仪（gas chromatograph with mass spectrometric analysis, GC-MS）。2004年1月起，位于梅斯黑德（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，该系统可提升对更多种类高全球增温潜势挥发性全氟烃类的检测能力。
更多详细信息可访问AGAGE官方主页：https://agage.mit.edu/instruments。如需获取旧版AGAGE数据包，请访问：http://cdiac.ess-dive.lbl.gov/ndps/alegage.html