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Atmosphere 2018, 9(11), 440; https://doi.org/10.3390/atmos9110440

On the Roles of Advection and Solar Heating in Seasonal Variation of the Migrating Diurnal Tide in the Stratosphere, Mesosphere, and Lower Thermosphere

Department of Physics and Astronomy, University of Louisville, Louisville, KY 40219, USA
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Received: 14 September 2018 / Revised: 5 November 2018 / Accepted: 6 November 2018 / Published: 12 November 2018
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Abstract

The migrating diurnal tide (DW1) presents a unique latitudinal structure in the stratosphere, mesosphere, and lower thermosphere. In this paper, the physical mechanisms that govern its seasonal variation are examined in these three regions using the 31.5-year (1979–2010) output from the extended Canadian Middle Atmosphere Model (eCMAM30). DW1 annual variation in the stratosphere is mainly controlled by the short-wave heating in the high latitudes, but by both the short-wave and adiabatic heating in the low latitudes. In the mesosphere, linear and nonlinear advection play important roles in the semiannual variation of the tide whereas short-wave heating does not. In the lower thermosphere, the annual variation of DW1 is mainly governed by the short-wave heating and linear advection. This study illustrates the complexity of the main physical mechanisms modulating the seasonal variations of DW1 in different regions of the atmosphere. View Full-Text
Keywords: migrating diurnal tide; seasonal variation; solar heating; wave-wave and wave-mean flow interactions migrating diurnal tide; seasonal variation; solar heating; wave-wave and wave-mean flow interactions
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Gu, H.; Du, J. On the Roles of Advection and Solar Heating in Seasonal Variation of the Migrating Diurnal Tide in the Stratosphere, Mesosphere, and Lower Thermosphere. Atmosphere 2018, 9, 440.

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