The Development and Initial Tests of an Atmospheric Model Based on a Vertical Coordinate with a Smooth Transition from Terrain Following to Isentropic Coordinates

D. R. Johnson; Zhuojian Yuan

doi:10.1007/s00376-998-0001-0

Impact Factor: 5.8

Volume 15 Issue 3

Jul. 1998

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1998 > 15(3): 283-299

The Development and Initial Tests of an Atmospheric Model Based on a Vertical Coordinate with a Smooth Transition from Terrain Following to Isentropic Coordinates

1.
Space Science and Engineering Center University of Wisconsin-Madison 1225 W. Dayton Street Madison, WI 53706, U.S.A,Space Science and Engineering Center University of Wisconsin-Madison 1225 W. Dayton Street Madison, WI 53706, U.S.A

doi: 10.1007/s00376-998-0001-0

Abstract
References
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Abstract:
An atmospheric model (η model) is developed by modifying the UW θ－σ hybrid model. In the η model, the vertical coordinate transforms smoothly from terrain following to isentropic coordinates. The model is developed to capitalize on the inherent advantage of numerical modeling in isentropic coordinates and to eliminate the interface between the sigma planetary boundary layer and isentropic free atmosphere present in the UW θ－σ model. This formulation provides the potential for the data assimilation and the application of higher order schemes. This paper describes the structure of the η model and presents results from initial numerical experiments. The first experiment tests the capability of the η model for simulating the baroclinic development process. In the 48-hr numerical weather forecast experiment, the η model produces reasonable precipitation and synoptic fields at all levels which are similar to those from the UW θ-σ model. The second and third experiments test the capability of the η model for conserving 1) the joint distribution of isentropic potential vorticity (IPV) and proxy ozone and 2) equivalent potential temperature under frictionless and isentropic conditions. These experiments show that distributions of IPV and proxy ozone in the pure isentropic domain and the distributions of prognostic and diagnostic equivalent potential temperature in the model domain remain highly correlated to day 10.
- Hybrid model,
- Isentropic study
References

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Manuscript History

Manuscript received: 10 July 1998

Manuscript revised: 10 July 1998

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

The Development and Initial Tests of an Atmospheric Model Based on a Vertical Coordinate with a Smooth Transition from Terrain Following to Isentropic Coordinates

1. Space Science and Engineering Center University of Wisconsin-Madison 1225 W. Dayton Street Madison, WI 53706, U.S.A,Space Science and Engineering Center University of Wisconsin-Madison 1225 W. Dayton Street Madison, WI 53706, U.S.A

Manuscript received: 1998-07-10
Manuscript revised: 1998-07-10

Abstract: An atmospheric model (η model) is developed by modifying the UW θ－σ hybrid model. In the η model, the vertical coordinate transforms smoothly from terrain following to isentropic coordinates. The model is developed to capitalize on the inherent advantage of numerical modeling in isentropic coordinates and to eliminate the interface between the sigma planetary boundary layer and isentropic free atmosphere present in the UW θ－σ model. This formulation provides the potential for the data assimilation and the application of higher order schemes. This paper describes the structure of the η model and presents results from initial numerical experiments. The first experiment tests the capability of the η model for simulating the baroclinic development process. In the 48-hr numerical weather forecast experiment, the η model produces reasonable precipitation and synoptic fields at all levels which are similar to those from the UW θ-σ model. The second and third experiments test the capability of the η model for conserving 1) the joint distribution of isentropic potential vorticity (IPV) and proxy ozone and 2) equivalent potential temperature under frictionless and isentropic conditions. These experiments show that distributions of IPV and proxy ozone in the pure isentropic domain and the distributions of prognostic and diagnostic equivalent potential temperature in the model domain remain highly correlated to day 10.

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