Quasi-10-day wave and semi-diurnal tide nonlinear interactions during the southern hemispheric SSW 2019 observed in the northern hemispheric mesosphere
Sudden stratospheric warming events occur typically over the winter Arctic and are well-known for being accompanied by diverse waves. A rare SSW occurred in the southern hemisphere in September 2019. Here, we combine mesospheric observations from the northern hemisphere to study the wave activities...
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| Format: | Dataset |
| Language: | unknown |
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Harvard Dataverse
2020
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| Online Access: | https://dx.doi.org/10.7910/dvn/kl6qul https://dataverse.harvard.edu/citation?persistentId=doi:10.7910/DVN/KL6QUL |
| Summary: | Sudden stratospheric warming events occur typically over the winter Arctic and are well-known for being accompanied by diverse waves. A rare SSW occurred in the southern hemisphere in September 2019. Here, we combine mesospheric observations from the northern hemisphere to study the wave activities before and during the warming event. A dual-station approach is implemented on high-frequency-resolved spectral peaks to diagnose the horizontal scales of the dominant waves. Diagnosed are multiple tidal components, multiple Rossby normal modes, and two secondary waves arising from nonlinear interactions between a tide and a Rossby wave. Most of these waves do not occur in a climatological sense and occur around the warming onset. Furthermore, the evolution of these waves can be explained using theoretical energy arguments. |
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