Publication Date:
2020-11-02
Description:
Both the meridional displacements of the upper-tropospheric westerly jet streams over West Asia and East Asia (WJMD and EJMD, respectively) in summer manifest as the leading pattern of the zonal wind anomalies over their local domains on the interannual time scale. The present study identifies a significant interannual relationship between these two leading patterns, tending to displace in the same meridional direction, either northward or southward. It is shown that the Silk Road Pattern (SRP), which is a zonal teleconnection pattern along the Asian jet, is an important modulator for the WJMD-EJMD relationship. Another factor is the precipitation anomalies over a broad tropical region, including the Indian subcontinent, the north Indian Ocean, and the western North Pacific. Enhanced (suppressed) tropical precipitation induces a northward (southward) displacement of the primary body of jet stream from West Asia to East Asia, which contributes to the in-phase WJMD-EJMD relationship, suggested by both the observational and simple model results. The SST anomalies associated with the tropical precipitation and in-phase WJMD-EJMD relationship are also discussed. The WJMD-EJMD relationship may have an important implication for identifying and explaining the teleconnections of rainfall and temperature over the broad area from West Asia to East Asia, and from the tropics to extratropics.
Print ISSN:
0894-8755
Electronic ISSN:
1520-0442
Topics:
Geography
,
Geosciences
,
Physics
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