SMLTM simulations of the diurnal tide: comparison with UARS observations

被引:26
作者
Akmaev, RA
Yudin, VA
Ortland, DA
机构
[1] SUNY STONY BROOK,INST TERR & PLANETARY ATMOSPHERES,STONY BROOK,NY 11794
[2] UNIV MICHIGAN,SPACE PHYS RES LAB,ANN ARBOR,MI 48109
来源
ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES | 1997年 / 15卷 / 09期
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
D O I
10.1007/s00585-997-1187-7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Wind and temperature observations in the mesosphere and lower thermosphere (MLT) from the Upper Atmosphere Research Satellite (UARS) reveal strong seasonal variations of tides, a dominant component of the MLT dynamics. Simulations with the Spectral mesosphere/lower thermosphere model (SMLTM) for equinox and solstice conditions are presented and compared with the observations. The diurnal tide is generated by forcing specified at the model lower boundary and by in situ absorption of solar radiation. The model incorporates realistic parameterizations of physical processes including various dissipation processes important for propagation of tidal waves in the MLT. A discrete multi-component gravity-wave parameterization has been modified to account for seasonal variations of the background temperature. Eddy diffusion is calculated depending on the gravity-wave energy deposition rate and stability of the background flow. It is shown that seasonal variations of the diurnal-tide amplitudes are consistent with observed variations of gravity-wave sources in the lower atmosphere.
引用
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页码:1187 / 1197
页数:11
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