Terrain gravity wave lift force parameterization method

A gravitational wave, parametric technique, applied in the field of atmospheric science research

Active Publication Date: 2018-01-19
NANJING UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a new topographic gravity wave lifting force parameterization method for the deficiencies in the existing topographic gravity wave parameterization scheme for the directional vertical shear processing of the environmental wind field, so as to better To characterize the influence of topographic gravity fluctuation transmission on atmospheric circulation, improve the simulation ability and forecast level of the model

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  • Terrain gravity wave lift force parameterization method
  • Terrain gravity wave lift force parameterization method
  • Terrain gravity wave lift force parameterization method

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Embodiment Construction

[0037] Taking the topographic gravity wave excited on Taiwan Island of China on August 18, 2007 as an example, the method for parameterizing the lifting force of the topographic gravity wave proposed by the present invention is described in detail.

[0038] The first step is terrain and environmental wind field preprocessing. According to the high-resolution terrain data provided by the National Atmospheric and Oceanic Administration of the United States, we can get image 3 The topographical distribution of Taiwan Island of China shown. According to the 2.5° reanalysis data provided by the European Center for Mesoscale Weather Forecasting, the vertical profile of the environmental wind field in Taiwan Island of China on August 18, 2007 can be obtained, see Figure 4 . This step is manually processed offline, and can be skipped directly in the mode system.

[0039] The second step is to calculate the blocking height of the airflow passing through the terrain. The maximum hei...

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Abstract

The present invention discloses a terrain gravity wave lift force parameterization method. The method comprises the following steps: calculating a blocking height of the pattern airflow passing the terrain; calculating spectral distribution of the terrain above the blocking height; calculating a perturbation speed corresponding to each component of the terrain gravity wave; and beginning with thefirst pattern layer above the blocking height, carrying out the following steps: calculating the changes in the horizontal wind direction of the pattern, calculating the momentum flux of the fluctuating component perpendicular to the horizontal wind field, and calculating the terrain gravity wave lift force. According to the method disclosed by the present invention, the directional vertical shearof the environmental wind field is processed, the influence of the terrain gravity wave transmission on the atmospheric circulation can better characterized, and the simulation ability and the prediction level of the pattern can be improved.

Description

technical field [0001] The invention relates to a parameterization method of terrain gravity waves in a numerical model, in particular to a parameterization method of terrain gravity wave lifting force excited in a directional shear airflow, and belongs to the field of atmospheric science research. Background technique [0002] The orographic gravity wave generated by the stratified stable airflow is disturbed by the terrain, which is an important physical process of mutual coupling between the tropospheric atmosphere and the middle and upper atmosphere. Vertically propagating orographic gravity waves can transport momentum from the surface to the upper middle and upper layers of the Earth's atmosphere, and affect the momentum and energy budget of the middle and upper atmospheric circulation through wave-current interactions. In large-scale numerical models, terrain gravity waves are usually subgrid physical processes that cannot be directly resolved by numerical models, so ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 徐昕王元唐滢
Owner NANJING UNIV
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