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

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

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3724804k&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 24, CiteID L24804

Physics

1

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Convective Processes, Atmospheric Processes: Global Climate Models (1626, 4928), Biogeosciences: Climate Dynamics (1620)

Scientific paper

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.

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