Nonhydrostatic generalization of a pressure-coordinate-based hydrostatic model with implementation in HIRLAM: validation of adiabatic core

Aarne Männik; Rein Rõõm; Andres Luhamaa

doi:10.3402/tellusa.v55i3.12096

Nonhydrostatic generalization of a pressure-coordinate-based hydrostatic model with implementation in HIRLAM: validation of adiabatic core

Tellus

Volume 55 (2003): Issue 3

By: Aarne Männik, Rein Rõõm and Andres Luhamaa

Open Access

|Jan 2003

Abstract

A nonhydrostatic pressure-coordinate model of atmospheric dynamics is developed. The model filters acoustic mode. Internal acoustic waves are filtered using the assumption of non-divergence of motion in pressure-space. External (Lamb mode) waves are filtered using the surface pressure adjustment. The model is implemented in the framework of the numerical weather prediction model HIRLAM (High Resolution Limited Area Model) as an extension to the hydrostatic kernel. The integration scheme is either the explicit or semi-implicit Eulerian leapfrog time stepping. Due to the acoustic filtration, the explicit scheme supports quite large time-steps. To check the validity of the model, several flow experiments with artificial orography are performed. The hydrostatic and nonhydrostatic flow regimes are investigated. The results of different models are compared mutually and with the analytic solutions. The real situation simulations are also presented to show the model’s forecasting capabilities.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusa.v55i3.12096 | Journal eISSN: 3035-9554

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Language: English

Page range: 219 - 231

Submitted on: Feb 26, 2002

Accepted on: Jan 14, 2003

Published on: Jan 1, 2003

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 2003 Aarne Männik, Rein Rõõm, Andres Luhamaa, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 55 (2003): Issue 3