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Mechanism for northward propagation of boreal summer intraseasonal oscillation: Convective momentum transport

Cited 47 time in Web of Science Cited 49 time in Scopus
Authors

Kang, In Sik; Kim, Daehyun; Kug, Jong Seong

Issue Date
2010-12
Publisher
American Geophysical Union
Citation
Geophysical Research Letters, Vol.37 No.24, p. L24804
Abstract
This study demonstrates that the momentum transport by cumulus convection plays a significant role in the organization and northward propagation of intraseasonal (ISO) convection anomalies over the Indian and western Pacific regions during boreal summer. A version of Seoul National University's atmosphere-ocean coupled general circulation model simulates northward propagation when convective momentum transport (CMT) is implemented; the northward propagation disappears when CMT is disabled. An axially symmetric shallow water model with a parameterized CMT is used to understand the role of CMT in the northward propagation of ISO. The basic mechanism of northward propagation is the lower-level convergence to the north of convection, which is induced by the secondary meridional circulation associated with large momentum mixing by convection in the region of large mean vertical shear. A large mean vertical shear exists in South Asian region during boreal summer. Citation: Kang, I.-S., D. Kim, and J.-S. Kug (2010), Mechanism for northward propagation of boreal summer intraseasonal oscillation: Convective momentum transport, Geophys. Res. Lett., 37, L24804, doi:10.1029/2010GL045072.
ISSN
0094-8276
URI
https://hdl.handle.net/10371/201025
DOI
https://doi.org/10.1029/2010GL045072
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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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