Global spectrum mode initial field vertical layering arbitrary interval smooth encryption method

Abstract

The invention discloses a global spectrum mode initial field vertical layering arbitrary interval smooth encryption technology, which relates to the field of numerical weather forecast, and adopts an exponential stretching algorithm to determine the number of mixed coordinate systems of newly added vertical layers according to a given air pressure interval needing to be encrypted and the number of the newly added vertical layers; the smoothness between the newly added vertical interlayer spacing and the port is ensured at the boundary end through second-order function smoothing; and after the vertical coordinates of the newly added layer are determined, cubic spline interpolation is carried out on the global spectrum-lattice point data from the original layer to a new layer, and in the cubic spline interpolation process, the interpolation speed is accelerated by using a catch-up method fast algorithm. According to the method, a new initial field for vertically and uniformly encrypting a specified area is finally provided, and the field can be suitable for a global spectrum mode and can stabilize integration; a vertical layer is additionally arranged above the top of the mode troposphere, analysis of upward propagation of gravity waves can be promoted, and the problem that the stratosphere is cold is solved.

Description

technical field [0001] The invention belongs to the technical field of numerical weather forecasting, and in particular relates to a method for smoothing and encrypting arbitrary intervals in the vertical layer of the initial field of a global spectrum model. Background technique [0002] At present, the vertical layer of the global spectrum model generally adopts 137 layers, which is close to the surface area at the bottom of the model. Since human activities are basically concentrated in this area, the layer is dense, while the layer is sparse at the top of the model in the stratosphere and above. Scientific research has shown that too sparse a layering of the stratosphere will lead to insufficient resolution of the upward propagation of gravity waves, resulting in warmer temperatures in the lower stratosphere and cooler top stratosphere. The above-mentioned colder problem at the top of the stratosphere can be effectively alleviated by local densification of the vertical s...

AI Technical Summary

Problems solved by technology

[0004] After the new vertical layer is determined, if linear interpolation is used for data interpolation, it has a high calculation speed but its accuracy is not high. If cubic spline interpolation is used, the calculation accuracy is improved but the calculation overhead is increased, especially for the global spectrum mode. Massive data, in order to ensure real-time calculation, it is necessary to develop a fast algorithm

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