Gravity waves in the equatorial thermosphere and their relation to lower atmospheric variability

Yasunobu Miyoshi,Hitoshi Fujiwara

doi:10.1186/bf03353164

Yasunobu Miyoshi, Hitoshi Fujiwara

Open Access

https://doi.org/10.1186/bf03353164

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Abstract

Abstract Using a general circulation model that contains the region from the ground surface to the upper thermosphere, we have examined characteristics of gravity waves in the equatorial thermosphere. At an altitude of 150 km, the dominant periods of gravity waves for zonal wave number 20 (zonal wavelength λ x ≈ 2000 km), 40 (λ x ≈ 1000 km) and 80 (λ x ≈ 500 km) are 3, 1.5 and 1 h, respectively. For individual zonal wave numbers, the corresponding dominant period becomes shorter at higher altitudes due to dissipation processes in the thermosphere, such as molecular viscosity and ion drag force, indicating that gravity waves with a larger horizontal phase velocity (larger vertical wavelength) can penetrate into the thermosphere. The longitudinal variation of gravity wave activity in the equatorial thermosphere and upward propagation of gravity waves from the lower atmosphere were also studied. The longitudinal distribution of gravity wave activity in the thermosphere is quite similar to that of gravity wave activity in the lower atmosphere and the cumulus convective activity in the tropical troposphere. Our results indicate that the strong energy flux due to gravity waves from the enhanced cumulus convective activity propagates upward into the upper thermosphere. The relation between the wind fluctuation associated with gravity waves and the ionospheric variation is discussed. Fluctuations of the neutral zonal wind with periods of 1–2 h are significant in the 200- to 300-km height region, and its amplitude sometimes exceeds 50 m s−1. These results suggest that upward propagating gravity waves can affect the ionospheric variation in the F-region.

Highlights

Gravity waves play an important role in the general circulation of the atmosphere in the stratosphere and mesosphere. Matsuno (1982) and Lindzen (1981) showed that the closing of mesospheric jets and the reversal of the zonal wind direction in the mesopause region were maintained by the gravity wave drag
Using a general circulation models (GCMs) that contains the region from the ground surface to the upper thermosphere, Miyoshi and Fujiwara (2008; hereafter MF08) recently investigated the characteristics of gravity waves in the thermosphere and upward propagation of gravity waves from the lower atmosphere to the thermosphere
In our study, we used a GCM that contains the region from the ground surface to the upper thermosphere to investigate the behavior of gravity waves in the equatorial thermosphere and the upward propagation of gravity waves from the lower atmosphere to the upper thermosphere

Summary

Introduction

Gravity waves play an important role in the general circulation of the atmosphere in the stratosphere and mesosphere. Matsuno (1982) and Lindzen (1981) showed that the closing of mesospheric jets and the reversal of the zonal wind direction in the mesopause region were maintained by the gravity wave drag. Gravity waves play an important role in the general circulation of the atmosphere in the stratosphere and mesosphere. Matsuno (1982) and Lindzen (1981) showed that the closing of mesospheric jets and the reversal of the zonal wind direction in the mesopause region were maintained by the gravity wave drag. Using the GFDL SKYHI general circulation models (GCMs) with horizontal resolutions of N90 (a grid spacing of 1.0◦ latitude × 1.2◦ longitude) and N150 (0.6◦ × 0.72◦), Hayashi et al (1989, 1997) and Jones et al (1997) investigated the characteristics of gravity waves in the stratosphere and mesosphere and the global distribution of u w ( denotes the zonal mean) due to gravity waves.

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Conclusion