Report on present observing capacities and gaps: Atmosphere

This document includes the description and assessment of atmospheric in situ observing systems, data collections and satellite products. On the basis of the assessment, critical knowledge gaps are identified and recommendations to solve them are provided. This document is intended to:
− define the current gaps in knowledge in atmospheric fields that are critical for operational weather forecasts, and for the understanding of processes that need to be better represented in climate models.
− suggest where the focus in future Arctic atmospheric observations should be.