Stationary wave interference and its relation to tropical convection and Arctic warming

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The interference between transient eddies and climatological stationary eddies in the Northern Hemisphere is investigated. The amplitude and sign of the interference is represented by the stationary wave index (SWI), which is calculated by projecting the daily 300-hPa streamfunction anomaly field onto the 300-hPa climatological stationary wave. ERA-Interim data for the years 1979 to 2013 are used. The amplitude of the interference peaks during boreal winter. The evolution of outgoing longwave radiation, Arctic temperature, 300-hPa streamfunction, 10-hPa zonal wind, Arctic sea ice concentration, and the Arctic Oscillation (AO) index are examined for days of large SWI values during the winter. Constructive interference during winter tends to occur about one week after enhanced warm pool convection and is followed by an increase in Arctic surface air temperature along with a reduction of sea ice in the Barents and Kara Seas. The warming of the Arctic does occur without prior warm pool convection, but it is enhanced and prolonged when constructive interference occurs in concert with enhanced warm pool convection. This is followed two weeks later by a weakening of the stratospheric polar vortex and a decline of the AO. All of these associations are reversed in the case of destructive interference. Potential climate change implications are briefly discussed.

Original languageEnglish (US)
Pages (from-to)1369-1389
Number of pages21
JournalJournal of Climate
Volume29
Issue number4
DOIs
StatePublished - Jan 1 2016

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warm pool
standing wave
Arctic Oscillation
warming
convection
sea ice
winter
eddy
polar vortex
longwave radiation
zonal wind
Northern Hemisphere
surface temperature
air temperature
anomaly
climate change
index
temperature

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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Stationary wave interference and its relation to tropical convection and Arctic warming. / Goss, Michael; Feldstein, Steven B.; Lee, Sukyoung.

In: Journal of Climate, Vol. 29, No. 4, 01.01.2016, p. 1369-1389.

Research output: Contribution to journalArticle

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