Variability and climate change signals in the Southern Ocean in the CSIRO and Antarctic CRC coupled ocean-atmosphere model. ...

• Main Author: Catchpole, A-M
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Antarctic; Southern Ocean; Antarc*
• Online Access: https://dx.doi.org/10.25959/23234813; https://figshare.utas.edu.au/articles/thesis/Variability_and_climate_change_signals_in_the_Southern_Ocean_in_the_CSIRO_and_Antarctic_CRC_coupled_ocean-atmosphere_model_/23234813

To investigate the variability and potential climate change impacts in the Southern Ocean I use output from the c10, c15 and c16 model runs of the CSIRO and Antarctic CRC coupled ocean-atmosphere model. 300 years of the output is reported here, after a spin up of approximately 1000 years. Modifications over the earlier versions of this model (c10 and c15), including improved topography in waters south of Australia make the c16 model run more suitable for examining natural variability in the southern ocean. We use potential temperature, salinity and velocity (21 depths, 66 longitudes and 29 latitudes in the Southern Hemisphere Ocean) and surface heat flux (66 longitudes and 29 latitudes in the Southern Hemisphere). Hovmoeller diagrams of potential temperature anomalies along a streamline show circumnavigating propagation. At 400m, the strongest anomaly timescales are 4-5 years (interannual anomalies) and take approximately 20 years to travel around the globe. The anomaly strength is not uniform along this ...