CPP-03. An Overview of the Vertical Structure of the Atmospheric Boundary Layer in the Central Arctic during MOSAiC

Abstract
The structure of the central Arctic atmospheric boundary layer (ABL) dictates the transfer of energy, moisture, and momentum between the Earth’s surface and overlying atmosphere. The ABL is characterized by its height and stability, and interacts with low-level jets (LLJs), temperature inversions (TIs), and atmospheric moisture. Using radiosonde, meteorological tower, and ceilometer data from MOSAiC, we reveal the annual cycle of these atmospheric thermodynamic and kinematic features. A self-organizing map (SOM), which determines the different features present in the training data and groups the data into a user-specified number of patterns, is used to reveal the range of ABL structures (height and stability) in the central Arctic, and their relative frequencies. We then analyze the atmospheric features of interest in the context of the stability regimes identified by the SOM patterns. In this presentation we share the observed profile structures revealed by the SOM, as well as a summary of ABL features (height, stability, various turbulence metrics), LLJ features (frequency, height, and speed), TI features (frequency, height, and intensity), and moisture features (cloud frequency, cloud base height, and liquid water path) observed in the presence of the various stability regimes.