Schematic describing the key features that drive Korean meteorology in late spring. Shading indicates the mean position of the westerly polar jet stream (upper-level, 250 hPa) derived from wind speeds averaged over the entire KORUS-AQ measurement period (01 May–10 June 2016; NCEP–NCAR meteorological reanalysis). Brown symbols indicate important low-level features. Primary dust source regions (Gobi and Taklamakan deserts) are denoted by a dashed orange circle. Black box indicates the approximate KORUS-AQ study region (Figure 1). The location of each atmospheric component in this diagram varies. DOI: https://doi.org/10.1525/elementa.395.f2