NUMERICAL EXPERIMENTS ON NH SUBTROPICAL UPPER TROPOSPHERIC QUASI-STATIONARY VORTICES IN SUMMER

Zhu Zhengxin; Cheng Shaopeng

doi:10.1007/BF02656782

Impact Factor: 3.9

Volume 5 Issue 2

Apr. 1988

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1988 > 5(2): 209-216

NUMERICAL EXPERIMENTS ON NH SUBTROPICAL UPPER TROPOSPHERIC QUASI-STATIONARY VORTICES IN SUMMER

1.
Nanjing Institute of Meteorology, Nanjing,Nanjing Institute of Meteorology, Nanjing

doi: 10.1007/BF02656782

Abstract
References
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Abstract:
To reveal the possible factors affecting the maintenance and interannual variations of the subtropical planetary-scale vortices such as the south Asian anticyclone and the mid-oceanic troughs, a series of nu-merical experiments are conducted with a quasi -geostrophic low-resolution spectral model. Firstly a simu-lation experiment is performed in which the realistic thermal and topographic forcing are incorporated. The results of simulation show a certain similarity to the actual subtropical flow field in July. On the basis of simulation experiment a series of contrast experiments are performed. It is found that the topog-raphic boundary forcing is less important than the thermal forcing in the dynamics of these systems, and that the anomaly of heating field may cause significant change in position and intensity of the south Asian high and the other systems. It is speculated that the response of the subtropical large-scale systems to heat-ing anomaly is an important cause for the interannual variations of circulation, especially the monsoon circulation.
References

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Manuscript History

Manuscript received: 10 April 1988

Manuscript revised: 10 April 1988

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

NUMERICAL EXPERIMENTS ON NH SUBTROPICAL UPPER TROPOSPHERIC QUASI-STATIONARY VORTICES IN SUMMER

1. Nanjing Institute of Meteorology, Nanjing,Nanjing Institute of Meteorology, Nanjing

Manuscript received: 1988-04-10
Manuscript revised: 1988-04-10

Abstract: To reveal the possible factors affecting the maintenance and interannual variations of the subtropical planetary-scale vortices such as the south Asian anticyclone and the mid-oceanic troughs, a series of nu-merical experiments are conducted with a quasi -geostrophic low-resolution spectral model. Firstly a simu-lation experiment is performed in which the realistic thermal and topographic forcing are incorporated. The results of simulation show a certain similarity to the actual subtropical flow field in July. On the basis of simulation experiment a series of contrast experiments are performed. It is found that the topog-raphic boundary forcing is less important than the thermal forcing in the dynamics of these systems, and that the anomaly of heating field may cause significant change in position and intensity of the south Asian high and the other systems. It is speculated that the response of the subtropical large-scale systems to heat-ing anomaly is an important cause for the interannual variations of circulation, especially the monsoon circulation.