Japan Geoscience Union Meeting 2014

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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)

3:15 PM - 3:30 PM

[MIS24-08] A mechanistic model of double-diffusive intrusions

*Takashi NOGUCHI1 (1.Graduate School of Engineering, Kyoto University)

Keywords:double-diffusive convection, lateral mixing

Dynamical structure of double-diffusive interleaving at a density-compensating thermohaline front is investigated. Numerical simulations successfully reproduced a series of sloped intrusive motions (fig. a). It is revealed that the finger convection and its collective vertical buoyancy transport drastically changes the inner structure of the layers as well as the slope of the intrusion layers. To understand the dynamical balance of the motions in layers, a mechanistic model of intrusive layers was devised for an idealised configuration in which a unit layer repeats in vertical direction (fig. b). Transports of heat and salt by small-scale convective motions are parameterised in terms of large-scale quantities. Balances between parameterised transports yielded results qualitatively consistent with that of the numerical simulations.Acknowledgements: This work was supported by JSPS Grant-in-Aid for Young Scientists B 23740354.