The Development of a Nonhydrostatic Global Spectral Model |
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Authors: | ZHAO Bin and ZHONG Qing |
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Institution: | National Meteorological Center, Beijing 100081,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract: | With the development of numerical weather prediction technology, the
traditional global hydrostatic models used in many countries of the world
for operational weather forecasting and numerical simulations of general
circulation have become more and more unfit for high-impact weather
prediction. To address this, it is important to invest in the development of
global nonhydrostatic models. Few existing nonhydrostatic global models use
consistently the grid finite difference scheme for the primitive equations
of dynamical cores, which can subsequently degrade the accuracy of the
calculations. A new nonhydrostatic global spectral model, which utilizes the
Eulerian spectral method, is developed here from NCAR Community Atmosphere
Model 3.0 (CAM3.0). Using Janjic9s hydrostatic/nonhydrostatic method, a
global nonhydrostatic spectral method for the primitive equations has been
formulated and developed. In order to retain the integrity of the
nonhydrostatic equations, the atmospheric curvature correction and
eccentricity correction are considered. In this paper, the Held-Suarez
idealized test and an idealized baroclinic wave test are first carried out,
which shows that the nonhydrostatic global spectral model has similar
climate states to the results of many other global models for long-term
idealized integration, as well as better simulation ability for short-term
idealized integration. Then, a real case experiment is conducted using the
new dynamical core with the full physical parameterizations of subgrid-scale
physical processes. The 10-day numerical integration indicates a decrease in
systematic error and a better simulation of zonal wind, temperature, and
500-hPa height. |
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Keywords: | nonhydrostatic global spectral model Held-Suarez test baroclinic wave test |
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