The Modified Envelope Orography and the Air Flow over and around Mountains

Li Long; Zhu Baozhen

doi:10.1007/BF03179759

Impact Factor: 5.8

Volume 7 Issue 3

Jul. 1990

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1990 > 7(3): 249-260

The Modified Envelope Orography and the Air Flow over and around Mountains

1.
Beijing Meteorological Centre, State Meteorological Administration, Beijing 100081,Institute of Atmospheric Physics, Academia Sinica, Beijing, 100080

doi: 10.1007/BF03179759

Abstract
References
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Abstract:
By use of the two-layer adiabatic globe spectral model and the zonally averaged climatic data of winter season as initial values, 10-day integrations are carried out based on three kinds of model topography (i.e., (1) the averaged to-pography; (2) the envelope topography; (3) the modified envelope topography). The results show that the orography of the Northern Hemisphere plays an important role in the simulation of large-scale weather patterns in winter sea-son. The simulation based on the envelope topography developed by Wallace et al. has some improvements in the Rocky Mountains area. But this scheme causes very serious horizontal expansion around the Tibetan Plateau (hereafter referred to as the TP). A modified envelope topography scheme has been worked out that increases the slope of the TP by decreasing; the horizontal expansion while keeping the maximum altitude. The results show some improve-ments of the scheme around the TP. By analysis of the mechanical effects of the large-scale orography on the currents, the different forcings of the air flow over and around the TP sad the Rocky Mountain (the RM) are investi-gated.
References

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Manuscript History

Manuscript received: 10 July 1990

Manuscript revised: 10 July 1990

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 Modified Envelope Orography and the Air Flow over and around Mountains

1. Beijing Meteorological Centre, State Meteorological Administration, Beijing 100081,Institute of Atmospheric Physics, Academia Sinica, Beijing, 100080

Manuscript received: 1990-07-10
Manuscript revised: 1990-07-10

Abstract: By use of the two-layer adiabatic globe spectral model and the zonally averaged climatic data of winter season as initial values, 10-day integrations are carried out based on three kinds of model topography (i.e., (1) the averaged to-pography; (2) the envelope topography; (3) the modified envelope topography). The results show that the orography of the Northern Hemisphere plays an important role in the simulation of large-scale weather patterns in winter sea-son. The simulation based on the envelope topography developed by Wallace et al. has some improvements in the Rocky Mountains area. But this scheme causes very serious horizontal expansion around the Tibetan Plateau (hereafter referred to as the TP). A modified envelope topography scheme has been worked out that increases the slope of the TP by decreasing; the horizontal expansion while keeping the maximum altitude. The results show some improve-ments of the scheme around the TP. By analysis of the mechanical effects of the large-scale orography on the currents, the different forcings of the air flow over and around the TP sad the Rocky Mountain (the RM) are investi-gated.