New data sets from the global AGAGE network of abundances and emissions of chemically and radiatively important trace gases

New data products from the Advanced Global Atmospheric Gases Experiment (AGAGE) provide expanded observational records and improved tools for tracking long-lived greenhouse gases and ozone-depleting substances. First, updated high-frequency in situ measurements from AGAGE stations offer site-level monthly mean mole fractions for over 50 trace gases, including chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs), hydrochlorofluorocarbons (HCFCs), perfluorocarbons (PFCs), sulfur hexafluoride (SF₆), nitrogen trifluoride (NF₃), and other climate-relevant species. These records incorporate the latest calibrations and quality assurance protocols and represent the most comprehensive real-time network available for these compounds. Second, the historical record has been extended using measurements of archived air samples collected in the Northern and Southern Hemispheres, with air collected between 1973 and 2016. These measurements enable reconstruction of atmospheric mole fractions prior to the operation of continuous in situ monitoring. Finally, a companion dataset provides annually updated global emissions and surface mean mole fraction trends for 42 compounds, derived using a 12-box global atmospheric model and inverse estimation techniques. These data integrate the in situ and archived records to produce consistent global trends in atmospheric composition and emissions from 1978 to present. Together, these datasets form a foundational resource for understanding the past and present evolution of key atmospheric trace gases, supporting research, policymaking, and compliance with international agreements such as the Montreal Protocol and the Kigali Amendment.