A phase-independent expression for the energy flux associated with inertia-gravity waves

Hidenori AIKI

Presentation information

Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS24_28PM1] Geophysical fluid dynamics-Transfield approach to geoscience

Mon. Apr 28, 2014 2:15 PM - 4:00 PM 313 (3F)

Convener:*Keita Iga(Atmosphere and Ocean Research Institute, The University of Tokyo), Kensuke Nakajima(Department of Earth and Planetary Sciences,Flculty of Sciences,Kyushu University), Shigeo Yoshida(Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University), Takatoshi Yanagisawa(Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology), Hidenori Aiki(Japan Agency for Marine-Earth Science and Technology), Chair:Kensuke Nakajima(Department of Earth and Planetary Sciences,Flculty of Sciences,Kyushu University)

3:00 PM - 3:15 PM

[MIS24-07] A phase-independent expression for the energy flux associated with inertia-gravity waves

*Hidenori AIKI¹ (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:inertia-gravity waves, energy flux, phase dependency

For diagnosing the effect of stationary Rossby waves on atmospheric circulation, a phase-independent expression for the wave activity flux has been developed by Takaya and Nakamura (2001) using quasigeostrophic equations. On the other hand, concerning inertia-gravity waves, a phase-expression has not been derived in previous studies. Recently we have developed a phase-independent expression for both the energy flux and the pseudo momentum flux associated with inertial-gravity waves. We have investigated the performance of the new expression using high-resolution simulations for internal waves in the ocean, such as internal gravity waves generated by a moving storm (figure) as well as tidal internal waves in JCOPE-T. The new expression for the energy flux may be used to reduce a noise associated with sampling errors in a model output, while the new expression for the pseudomomentum flux may be used for the diagnosis of mountain waves.