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Preprints
https://doi.org/10.5194/acp-2019-1046
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1046
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Jan 2020

Submitted as: research article | 13 Jan 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Propagation of gravity waves and its effects on pseudomomentum flux in a sudden stratospheric warming event

In-Sun Song1, Changsup Lee1, Hye-Yeong Chun2, Jeong-Han Kim1, Geonhwa Jee1, Byeong-Gwon Song1, and Julio T. Bacmeister3 In-Sun Song et al.
  • 1Korea Polar Research Institute, Incheon, Korea
  • 2Department of Atmospheric Sciences, Yonsei University, Seoul, Korea
  • 3National Center for Atmospheric Research, Boulder, CO, USA

Abstract. Effects of realistic propagation of gravity waves (GWs) on distribution of GW pseudomomentum fluxes (Fps) are explored using a global ray-tracing model for the 2009 sudden stratospheric warming (SSW). Four-dimensional (4D) (x–z, t) and two-dimensional (2D) (z, t) results are compared for various parameterized Fps. In ray-tracing equations, refraction due to horizontal wind shear and curvature effects are found important and comparable to one another in magnitude. In the 4D, westward Fps are enhanced in the upper troposphere and northern stratosphere, due to refraction and curvature effects around fluctuating jet flows associated with large-scale waves. In the northern polar upper mesosphere and lower thermosphere, eastward Fps are increased in the 4D. GWs are found to propagate more to the upper atmosphere in the 4D, since horizontal propagation and change in wavenumbers due to refraction and curvature effects can make it more possible that GWs elude critical-level filtering and saturation in the lower atmosphere. GW focusing and ray-tube effects have some impacts on changes in Fps. Focusing effects occur around jet cores, and ray-tube effects appear where the polar stratospheric jets vary substantially in space and time. Increase in the Fps in the northern upper stratosphere and the lower thermosphere begins from the early stage of the SSW evolution, and it is present even after the onset in the 4D. Significantly enhanced Fps in the northern stratosphere are likely related to GWs with small intrinsic group velocity (wave capture), and they would change nonlocally nearby large-scale vortex structure without changing substantially local mean flows.

In-Sun Song et al.

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In-Sun Song et al.

In-Sun Song et al.

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Latest update: 02 Jun 2020
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Short summary
A modeling study on effects of propagation of atmospheric gravity waves is carried out for the 2009 sudden stratospheric warming event. It is found that gravity-wave induced momentum fluxes are significantly affected by the horizontal refraction and Earth's curvature effects. Gravity-wave convergence and effects of ray geometry also have some impacts. In the evolution of the SSW, significantly enhanced momentum fluxes are likely to change nonlocally nearby large-scale vortex structure.
A modeling study on effects of propagation of atmospheric gravity waves is carried out for the...
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