Dynamical response of Arctic stratospheric polar vortex to ENSO and PDO sea surface temperature anomalies in idealized modeling ...
<!--!introduction!--> The intensity of the stratospheric polar vortex (iSPV) is predicted less than 2 weeks ahead. However, low-frequency components of the climate system, such as large-scale sea surface temperature anomalies (SSTAs) e.g. El Niño–Southern Oscillation (ENSO) and Pacific Decadal...
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| Format: | Conference Object |
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GFZ German Research Centre for Geosciences
2023
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| Online Access: | https://dx.doi.org/10.57757/iugg23-2390 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018367 |
| Summary: | <!--!introduction!--> The intensity of the stratospheric polar vortex (iSPV) is predicted less than 2 weeks ahead. However, low-frequency components of the climate system, such as large-scale sea surface temperature anomalies (SSTAs) e.g. El Niño–Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO), extend the period of stratospheric dynamics’ prediction. In this work, the response of iSPV anomalies to large-scale SSTAs is evaluated using idealized modeling on ISCA platform. It is shown that SSTAs in the mid-latitudes of the Pacific Ocean on their own do not significantly influence the formation of iSPV. With positive SSTAs in the Niño-3 region (CEN), a weakening of the polar vortex by 40% is observed. The weakening of the vortex with positive SSTAs in the central part of the tropical Pacific Ocean (ENM) is comparable to the effect of the CEN. During La Niña (LN) years the vortex weakened by no more than 20%. The positive PDO phase significantly increases the effect of EN, while the ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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