Closed ribeiron closed 1 year ago
What I do know: THE SUPPRESSION OCCURS WHEN THERE IS A WEAKENING OF THE SOUTHEASTERLY WINDS.
Possible causes for that:
Other options:
I have looked into Stratospheric Warming and found the information that it’s only happened twice since 1980. 2002 and 2019 The true definition is a wind reversal at 10hpa. Here is an article from ABC from the last time it happened: https://www.abc.net.au/news/2019-09-06/rare-weather-event-over-antarctica-drives-hot-outlook/11481498 Note that "SSW is rare in the southern hemisphere with only one major event ever identified, in 2002 — one of Australia's driest years on record. Dr Hendon said similar, less intense stratospheric warmings had been linked to other dry years in Australia."
What I am reading is that, although we know that sudden stratospheric warming events cause weak vortex in spring, we can get a weaker vortex without a full SSW. So I went on to pursue a polar vortex index. I got 3 different ones:
The notebook can be found here: https://github.com/oceanhackweek/ohw23_proj_SAupwelling/blob/main/Notebooks/AntarcticPV_timeseries.ipynb
The next step is to compare these indexes to the actual mooring data from SA to see if we find anything interesting there.
This issue is done, so I will be closing it now.