Abstract
This paper uses dissipation values derived from UARS/HRDI observations in a recently published diurnal-tide model. These model structures compare quite well with the UARS/HRDI observations with respect to the annual variation of the diurnal tidal amplitudes and the size of the amplitudes themselves. It is suggested that the annual variation of atmospheric dissipation in the mesosphere-lower thermosphere is a major controlling factor in determining the annual variation of the diurnal tide.
Highlights
The diurnal tide in the mesosphere-lower thermosphere (MLT) region has received a good deal of attention in recent years
Yudin et al (1997a) argue that gravity-wave parameterizations have been mostly constrained by ®tting the mean zonal winds and temperatures at middle and high latitudes and that the new UARS/HRDI observations of the diurnal tide represent a unique constraint on the atmospheric dissipation at low latitudes
The main conclusion of this paper is that it is probably the incorrect speci®cation of atmospheric dissipation which is responsible for the inability of ®rst-principle tidal models to determine correctly the annual variation and amplitude of the diurnal tide in the MLT region
Summary
The diurnal tide in the mesosphere-lower thermosphere (MLT) region has received a good deal of attention in recent years. Some of this is due to its observed prominence in the HRDI/WINDII observations (see, e.g., Morton et al, 1993; Hays et al, 1994; McLandress et al, 1996) while another factor is recent advancement in modeling the diurnal tide and its annual variation (Hagan et al, 1995a). The purposes of this paper are to try to resolve some of the apparent discrepancies between observations and model results for the diurnal tide and to gain some insight into the atmospheric processes that control its variation.
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