1. Interdecadal circumglobal teleconnection pattern during boreal summer
- Author
-
Jianshe Lin, Tianjun Zhou, and Bo Wu
- Subjects
Atmospheric Science ,010504 meteorology & atmospheric sciences ,Baroclinity ,Northern Hemisphere ,010502 geochemistry & geophysics ,Atmospheric sciences ,01 natural sciences ,Pacific–North American teleconnection pattern ,Climatology ,Barotropic fluid ,Extratropical cyclone ,Precipitation ,Boreal summer ,Geology ,0105 earth and related environmental sciences ,Teleconnection - Abstract
A new atmospheric teleconnection pattern on the interdecadal time scale, interdecadal circumglobal teleconnection pattern (ID-CGT pattern), is identified. The ID-CGT pattern dominates the interdecadal variability of the Northern Hemisphere (NH) extratropical circulation during boreal summer. The ID-CGT pattern has a great climate effect and can cause an alternatively positive and negative pattern of the NH mid-latitude land surface temperature anomalies. Compared with its counterpart on the interannual time scale (IA-CGT pattern), the ID-CGT pattern shows following three distinctive features. Firstly, although both ID-CGT and IA-CGT patterns show zonal wavenumber-5 structures, the former nodes shift westward relative to the latter by about 1/4 wavelength. Secondly, all the five nodes of the ID-CGT pattern possess barotropic structures, unlike the IA-CGT, which has a baroclinic node. Thirdly, the ID-CGT pattern is associated with the Atlantic multi-decadal oscillation, whereas the IA-CGT pattern is with the Indian summer monsoon precipitation anomalies.
- Published
- 2016