A Formulation of a Phase-Independent Wave-Activity Flux for Stationary and Migratory Quasigeostrophic Eddies on a Zonally Varying Basic Flow

Atmospheric response to the autumn sea-ice free Arctic and its detectability

“…4 except for the responses in the SENS and the SENS which might be a possible reason to cause the similar JF atmospheric responses. The wave activity flux is computed using the method defined in Takaya and Nakamura (2001). It's clearly shown that the anomalous wave energy comes from the Arctic Ocean and the northern Pacific, and propagates to the sub-Arctic region (Fig.…”

Asymmetry of the winter extra-tropical teleconnections in the Northern Hemisphere associated with two types of ENSO

“…Thus, not only the two types of El Niño but also La Niña are well separated using our current methods. The wave activity flux (Takaya and Nakamura 2001) is used to explore the stationary Rossby wave sources and propagation induced by ENSO events. It is a phase-independent flux and is parallel to the local group velocity of a stationary Rossby wave train in the Wentzel-KramersBrillouin (WKB) approximation.…”

A comprehensive analysis of coherent rainfall patterns in China and potential drivers. Part II: intraseasonal variability

“…We then compute the wave activity flux W from the regressed and the climatological mean flow Ū = (ū (x, y),v(x, y)). Takaya and Nakamura (2001) derived the horizontal components for stationary Rossby waves in a zonally varying basic flow:…”