Special Issue: Dynamics and Structure of the Mesopause Region (DYSMER)
Lagrangian transport experiments in the MLT region
Earth, Planets and Space volume 51, pages 745–750 (1999)
In order to evaluate material transports in the upper mesosphere and lower thermosphere (MLT) region, Lagrangian transport experiments are performed using wind fields simulated by the Kyushu University middle atmosphere general circulation model (Miyahara and Miyoshi, 1997; Miyahara et al., 1993). The Lagrangian mean meridional circulation is different from the residual mean circulation defined by the Transformed Eulerian Mean equation system, which is thought to be approximately equal to the Lagrangian mean meridional circulation in the middle atmosphere in case of weak dissipation and transience (Andrews and McIntyre, 1978; Andrews et al., 1987). It is considered that the diffusivity caused by the transience and dissipation of various wave motions in the MLT region has significant effects on the material transport in this region, and makes them different from each other.
Andrews, D. G. and M. E. McIntyre, An exact theory of nonlinear waves on a Lagrangian-mean flow, J. Fluid. Mech., 89, 609–646, 1978.
Andrews, D. G., J. R. Holton, and C. B. Leovy, Middle Atmosphere Dynamics, 489 pp., Academic Press., San Diego, 1987.
Fauliot, V., G. Thuillier, and F. Vial, Mean vertical wind in the mesosphere-lower thermosphere region (80–120 km) deduced from the WINDII observations on board UARS, Ann. Geophys., 15, 1221–1231, 1997.
Forbes, J. M., R. G. Roble, and C. G. Fesen, Acceleration, heating, and compositional mixing of the thermosphere due to upward propagating tides, J. Geophys. Res., 98, 311–321, 1993.
Kida, H., General circulation of air parcels and transport characteristics derived from a hemispheric GCM. Part 1. A determination of advective mass flow in the lower stratosphere, J. Meteor. Soc. Japan, 61, 171–187, 1983.
Miyahara, S. and Y. Miyoshi, Migrating and non-migrating atmospheric tides simulated by a middle atmosphere general circulation model, Adv. Space Res., 20, 1201–1207, 1997.
Miyahara, S., Y. Yoshida, and Y. Miyoshi, Dynamic coupling between the lower and upper atmosphere by tides and gravity waves, J. Atmos. Terr. Phys., 55, 1039–1053, 1993.
Miyahara, S., Y. Miyoshi, and K. Yamashita, Variations of migrating and non-migrating tides simulated by the Middle Atmosphere Circulation Model at Kyushu University, Adv. Space Res., 1999 (in press).
Roble, R. G. and G. G. Shepherd, An analysis of wind imaging interferometer observations of O(1S) equatorial emission rates using the thermosphere ionosphere-mesosphere-electrodynamics general circulation model, J. Geophys. Res., 102, 2467–2474, 1997.
Shepherd, G. G., R. G. Roble, C. McLandress, and W. E. Ward, WINDII observations of the 558 nm emission in the lower thermosphere: the influence of dynamics on composition, J. Atmos. Terr. Phys., 59, 655–667, 1997.
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Watanabe, S., Miyahara, S. & Miyoshi, Y. Lagrangian transport experiments in the MLT region. Earth Planet Sp 51, 745–750 (1999). https://doi.org/10.1186/BF03353233