SSW | Simon H. Lee

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The stratospheric polar vortex is currently at record-strong levels, based on the metrics of 10 hPa 60°N zonal-mean zonal-wind and 60-90°N average temperature. This is likely to be due to a combination of the timing and duration of the major Sudden Stratospheric Warming (SSW) in January: the duration of easterlies (most of January) shielded the …

Continue reading "Final Stratospheric Warmings"

24 January 2009. This was the 'central date' (defined as the day on which the 10 hPa 60°N zonal-mean zonal wind reverses from westerly to easterly) of a remarkable, record-breaking major sudden stratospheric warming event. There are several reasons why this event is worth a revisit. The January 2009 SSW set a large number of …

Continue reading "The January 2009 SSW"

Non-downward propagating SSWs?  Major stratospheric sudden warming events (SSWs) attract widespread attention because they are now known to have significant impacts on the tropospheric circulation (e.g. Baldwin and Dunkerton 2001, hereafter BD01). Anomalies in the stratospheric circulation (often expressed as the Northern Annual Mode (NAM) index, or polar cap geopotential height anomalies) propagate downwards through …

Continue reading "Not all SSWs were created equal"

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