The Impact of Annual Cycles on Anomalous Wind Meridional Structures of the ENSO

The anomalous zonal wind moves southward during the ENSO mature phase in boreal winter. Previous studies suggest that it may be caused by the nonlinear interaction of annual cycles or the influence of background mean state changes. In this research, the ECHAM4.6 atmospheric model is used to confirm...

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Bibliographic Details
Published in:Atmosphere 2024-08, Vol.15 (8), p.950
Main Authors: Gong, Yuhan, Lu, Jiahao, Li, Tian
Format: Article
Language:English
Subjects:
Advection
Annual cycles
Annual variations
anomalous zonal wind
asymmetry
Atmospheric circulation
Atmospheric models
Climate change
Climate cycles
ECHAM4.6
El Nino
El Nino phenomena
El Nino-Southern Oscillation event
ENSO
Environmental aspects
Experiments
Influence
Precipitation
Seasonal variations
Solar radiation
Southern Oscillation
Temperature
Weather forecasting
Wind
Winds
Winter
Zonal winds
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Summary:The anomalous zonal wind moves southward during the ENSO mature phase in boreal winter. Previous studies suggest that it may be caused by the nonlinear interaction of annual cycles or the influence of background mean state changes. In this research, the ECHAM4.6 atmospheric model is used to confirm the mechanism of the anomalous zonal wind southward shifting. The annual cycle of solar radiation and SST are removed in the sensitivity experiments to avoid the interaction between the ENSO and annual cycle. The results show that the north–south asymmetry mode of the ENSO anomalous wind field is not the result of a nonlinear interaction between ENSO and the annual cycle. The mean v-winds in winter motivate the southward shifting of the ENSO anomalous wind field through advection.
ISSN:2073-4433
2073-4433
DOI:10.3390/atmos15080950