Teleconnections from Tropics to Northern Extratropics through a Southerly Conveyor
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Authors
Wang, Zhuo
Chang, C.-P.
Wang, Bin
Jin, Fei-fei
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Date of Issue
2005-11
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Abstract
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.
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Article
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Meteorology
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Citation
Journal of Atmospheric Sciences, Vol. 62, pp. 4057-4070, November 2005.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.