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A mechanism for formation of the western North Pacific monsoon trough: nonlinear upscale cascade
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A mechanism for formation of the western North Pacific monsoon trough: nonlinear upscale cascade
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A mechanism for formation of the western North Pacific monsoon trough: nonlinear upscale cascade
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Journal Article
A mechanism for formation of the western North Pacific monsoon trough: nonlinear upscale cascade
2021
Overview
Linear and nonlinear barotropic vorticity model frameworks are constructed to understand the formation of the monsoon trough in boreal summer over the western North Pacific. The governing equation is written with respect to specified zonal background flows, and a wave perturbation is prescribed in the eastern boundary. Whereas a uniform background mean flow leads no scale contraction, a confluent background zonal flow causes the contraction of zonal wavelength. Under linear dynamics, the wave contraction leads to the development of smaller scale vorticity perturbations. As a result, there is no upscale cascade. Under nonlinear dynamics, cyclonic (anticyclonic) wave disturbances shift northward (southward) away from the central latitude due to the vorticity segregation process. The merging of small-scale cyclonic and anticyclonic perturbations finally leads to the generation of a pair of large-scale cyclonic and anti-cyclonic vorticity gyres, straddling across the central latitude. The large-scale cyclonic circulation due to nonlinear upscale cascade can be further strengthened through a positive convection-circulation feedback.
