Cyclones frequently affect the Ross Sea sector of the Southern Ocean, but their short-term impacts on sea ice–ocean interactions and water-mass variability remain insufficiently quantified. This study investigates the hydrographic response of the Ross Sea to synoptic-scale and mesoscale cyclones using Argo float observations and cyclone tracking data from 2020 to 2025. Typical cyclone events passing near the Ross Sea were selected based on their trajectories, duration, and proximity to available Argo profiles. Sea level pressure fields were further used to characterize the evolution and movement of these cyclone systems. Temperature and salinity profiles before, during, and after cyclone passages were compared over approximately ±12 days around each event. Preliminary results show that selected cyclone events are associated with measurable changes in upper-ocean hydrographic structure. In particular, isohalines show evident shoaling after cyclone passages, although the timing of this response differs among events, occurring nearly synchronously with some cyclones but lagging by several days in others. Temperature responses also exhibit different tendencies among cases, suggesting that cyclone impacts on the upper ocean are modulated by local stratification, background water-mass structure, and the relative importance of vertical mixing and water-mass redistribution. Differences among events and float locations indicate that cyclone scale, pathway, and background ocean conditions may jointly regulate the magnitude and persistence of the oceanic response. These findings highlight the potential role of episodic cyclone forcing in modulating short-term hydrographic variability and high-salinity shelf water formation in the Ross Sea.

暂无