Fig. 5: Summary figure illustrating schematically each of the four regimes identified in this study, along with their locations.
From: Seasonal regimes of warm Circumpolar Deep Water intrusion toward Antarctic ice shelves
The regimes are enumerated and related to the numbering of the regimes in the Abstract. Regimes 1 and 3 are depth-latitude cross sections, whilst 2 and 4 are depth-longitude cross sections. The ice shelf margin is shown in red. In Regime 1, isopcynals (black lines) flatten to let CDW access the shelf. This is driven by a weakening in the strength of along-slope easterly winds. In Regime 2, the undercurrent (horizontal eastward arrow) accelerates due to a period of (Amundsen low-induced) sustained westerly winds, causing uplifted isopycnals and increased transport of CDW on to the shelf via troughs. In Regime 3, CDW can access the continental shelf only when DSW has been exported. In Regime 4, the outflow of DSW along the western edge of the canyon induces a SSH gradient which promotes shelf-ward CDW inflow along the opposing side.
