Non-static terrain gravity wave parameterization method
A gravity wave and non-hydrostatic technology, applied in the field of atmospheric science research, can solve the problem that the terrain gravity wave parameterization scheme cannot characterize the non-hydrostatic effect, etc.
Pending Publication Date: 2021-06-22
NANJING UNIV
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to propose a new non-static terrain gravity wave parameterization scheme to meet the development needs of high-resolution numerical models, aiming at the fact that the existing topographic gravity wave parameterization scheme cannot characterize the non-hydrostatic effect. Improving the simulation and forecasting ability of the model in complex terrain
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[0040] Taking the topographic gravity wave in the western region of the Qinghai-Tibet Plateau in December 2013 as an example, the non-static topographic gravity wave parameterization scheme proposed by the present invention is specifically described.
[0041] The first step is the preprocessing of terrain and ambient atmosphere. According to the 2.5° reanalysis data provided by the European Center for Mesoscale Weather Forecasting, the global terrain and sub-grid terrain distribution including the Qinghai-Tibet Plateau can be obtained, as shown in image 3 shown. At the same time, the vertical profile of wind speed and buoyancy frequency in the western plateau in December 2013 can also be obtained. This step is manually processed offline, and can be skipped directly in the mode system.
[0042] The second step is to calculate the surface momentum flux of the static terrain gravity wave. The maximum height of the terrain is 5864 meters, so the average wind speed, average buo...
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The invention discloses a non-static terrain gravity wave parameterization method. The method comprises the following steps: calculating a static terrain gravity wave surface momentum flux and a correction factor of a non-static effect on a terrain gravity fluctuation quantity flux; calculating a non-static terrain gravity wave surface momentum flux; from a first mode layer above the terrain height, the following steps are carried out: calculating the terrain gravity wave amplitude; calculating the fluctuation Richardson number and the saturation amplitude and momentum flux of terrain gravity waves; if the fluctuation Richardson number is greater than the critical value Ric, continuing vertical propagation until the mode top layer. According to the method, the non-static effect of terrain gravity waves is processed, sub-grid terrain gravity fluctuation quantity transmission in a high-resolution numerical mode and the influence of the sub-grid terrain gravity fluctuation quantity transmission on atmospheric circulation can be better represented, and the simulation forecasting capacity of the mode under the complex terrain is improved.
Description
technical field [0001] The invention relates to a method for parameterizing terrain gravity waves in numerical models, in particular to a method for parameterizing non-static terrain gravity waves in high-resolution numerical models, and belongs to the field of atmospheric science research. Background technique [0002] Terrain gravity waves are an important sub-grid physical process in numerical models, and play an important role in accurate numerical weather prediction and climate prediction. The horizontal resolution of the traditional numerical model is relatively coarse, so the horizontal scale of the subgrid terrain is also large, and the excited gravity waves are fluctuations of static equilibrium (McFarlane 1987). In recent years, with the development of numerical models, the horizontal resolution of the models has also been continuously improved, and has reached the order of ten kilometers from hundreds of kilometers. For example, the IFS forecast system of ECMWF ad...
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Login to View More IPC IPC(8): G06F30/20G06F111/10
CPCG06F30/20G06F2111/10Y02A90/10
Inventor 徐昕李闰秋张蓉蓉
Owner NANJING UNIV