This study uses MERRA-2 reanalysis (Gelaro et al., 2017) to identify discriminators of Antarctic atmospheric river (AR) environments and a subset of high-precipitation Antarctic AR environments. To do this, we identify a collection of analog environments (timesteps that feature the closest synoptic-scale environment to each AR, but no AR), a collection of landfalling Antarctic ARs, and a subset of high-impact ARs defined by highest attributable precipitaiton. This dataset includes the timestep, central longitude, and precipitation information for each of the timesteps in these three categories.

Gelaro, R., McCarty, W., Suarez, M.J., Todling, R., Molod, A., Takacs, L., Zhao, B. (2017). The modern-era retrospective analysis for research and application, version 2 (MERRA-2). Journal of Climate, 30(14). doi: 10.1175/JCLI-D-16-0758.1