Teleconnections from tropics to northern extratropics through a southerly conveyor

Zhuo Wang, C. P. Chang, Bin Wang, Fei Fei Jin

Research output: Contribution to journalArticlepeer-review


Rossby wave propagation theory predicts that Rossby waves in a tropical easterly flow cannot escape from the Tropics to the extratropics. Here the authors show that a southerly flow component in the basic state (a southerly conveyor) may transfer a Rossby wave source northward; thus, a forcing embedded in the deep tropical easterlies may excite a Rossby wave response in the extratropical westerlies. It is shown that the southerly conveyor determines the location of the effective Rossby wave source and that the extratropical response is relatively insensitive to the location of the tropical forcing, provided that the tropical response can reach the southerly conveyor. A stronger southerly flow favors a stronger extratropical response, and the spatial structure of the extratropical response is determined by the extratropical westerly basic flows.

Original languageEnglish (US)
Pages (from-to)4057-4070
Number of pages14
JournalJournal of the Atmospheric Sciences
Issue number11
StatePublished - Nov 2005
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science


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