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Effects of the low-frequency zonal wind variation on the high frequency atmospheric variability over the tropics

Cited 30 time in Web of Science Cited 32 time in Scopus
Authors

Sooraj, K. P.; Kim, Daehyun; Kug, Jong Seong; Yeh, Sang Wook; Jin, Fei Fei; Kang, In Sik

Issue Date
2009-09
Publisher
Springer Verlag
Citation
Climate Dynamics, Vol.33 No.4, pp.495-507
Abstract
Recently, there is increasing evidence on the interaction of atmospheric high-frequency (HF) variability with climatic low-frequency (LF) variability. In this study, we examine this relationship of HF variability with large scale circulation using idealized experiments with an aqua-planet Atmospheric GCM (with zonally uniform SST), run in different zonal momentum forcing scenarios. The effect of large scale circulation changes to the HF variability is demonstrated here. The HF atmospheric variability is enhanced over the westerly forced region, through easterly vertical shear. Our study also manifests that apart from the vertical wind shear, strong low-level convergence and horizontal zonal wind shear are also important for enhancing the HF variance. This is clearly seen in the eastern part of the forcing, where the HF activity shows relatively maximum increase, in spite of similar vertical shear over the forced regions. The possible implications for multi-scale interaction (e.g. MJO-ENSO interaction) are also discussed.
ISSN
0930-7575
URI
https://hdl.handle.net/10371/201027
DOI
https://doi.org/10.1007/s00382-008-0483-6
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  • College of Natural Sciences
  • Department of Earth and Environmental Sciences
Research Area Climate Change, Earth & Environmental Data, Severe Weather, 기후과학, 위험기상, 지구환경 데이터과학

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