Abstract:
:The stratospheric Arctic vortex (SAV) plays a critical role in forecasting cold winters in northern mid-latitudes. Its influence on the tropospheric mid- and high-latitudes has attracted growing attention in recent years. However, the trend in the SAV during the recent two decades is still unknown. Here, using three reanalysis datasets, we found that the SAV intensity during 1998-2016 has a strengthening trend, in contrast to the weakening trend before that period. Approximately 25% of this strengthening is contributed by the warming of sea-surface temperature (SST) over the central North Pacific (CNP). Observational analysis and model experiments show that the warmed CNP SST tends to weaken the Aleutian low, subsequently weakening the upward propagation of wavenumber-1 planetary wave flux, further strengthening the SAV. This strengthened SAV suggests important implications in understanding the Arctic warming amplification and in predicting the surface temperature changes over the northern continents.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Hu D,Guan Z,Tian W,Ren Rdoi
10.1038/s41467-018-04138-3subject
Has Abstractpub_date
2018-04-27 00:00:00pages
1697issue
1issn
2041-1723pii
10.1038/s41467-018-04138-3journal_volume
9pub_type
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