International Arctic Systems for Observing the Atmosphere (IASOA) provides and collects multi-year continuous data on atmospheric conditions in the Arctic. International Polar Year (IPY) maintains partnerships with Arctic observatories from Sweden, Canada, United States, Russia, Norway, Finland, and Greenland. Each IASOA observatory features extensive suites of co-located, research grade active, passive and in-situ observing systems. Atmospheric characteristics of interest are standard meteorology, greenhouse gases, atmospheric radiation, clouds, pollutants, chemistry, aerosols, and surface energy balances. IASOA operates within boundaries defined by (1) the Arctic (2) the atmosphere (3) the ground-based vantage point (4) data generated by instrument systems and (5) multi-year continuous records to support climate studies.