| 澳洲大陆热力强迫对南北半球环流异常的影响效应 |
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| 引用本文： | 徐祥德,赵天良,何金海,等.澳洲大陆热力强迫对南北半球环流异常的影响效应[J].大气科学,1993,17(6):641-650. |
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| 作者姓名： | 徐祥德 赵天良 何金海 等 |
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| 作者单位： | 中国气象科学研究院，南京气象学院，南京气象学院，南京气象学院 北京 100081，南京 210044，南京 210044，南京 210044 |
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| 摘 要： | 本文采用OSU-AGCM动力框架加入牛顿加热项构成的简化大气环流模式,研究澳洲大陆热力强迫与南北半球环流异常的相关关系。本文对不同平衡温度模拟结果的差异(偏差场)进行了分析,探讨某局地热力强迫对全球其它区域环流异常的影响效应.数值试验结果表明,南北半球海陆热力结构有利于两半球行星尺度经向环流的加强及其低纬跨赤道气流的形成:南半球澳洲大陆热力强迫可以通过东、西风带侧向藕合效应,显著地影响北半球中纬西风带急流状况;二维Rossby波能量频散径向传播可能足澳洲热力强迫与北半球常定环流系统的异常变化相关现象的重要成因,且澳洲大陆强迫产生的径向波列路经与PNA、EU型相似.
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| 关 键 词： | 波列 热力强迫 西风带 东风带 二维Rossby波 |
The Effect of Australian Continent Thermal Forcing on Anomalous Vanations of Circulation Systems in the Northern and Southern Hemispheres |
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| Xu Xiangde,Zhao Tianliang,He Jinhai and et al.The Effect of Australian Continent Thermal Forcing on Anomalous Vanations of Circulation Systems in the Northern and Southern Hemispheres[J].Chinese Journal of Atmospheric Sciences,1993,17(6):641-650. |
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| Authors: | Xu Xiangde Zhao Tianliang He Jinhai and |
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| Abstract: | The correlation between the thermal forcing of the Australian continent and anomalies of circulaiton systems in the Northern and Southern Hemispheres have been investigated by a simplified numerical model consisting of the dynamical framework of the OSU -GCM and a Newtonian heating term. The differences between results of simulations with different equilibrium temperatures reflect the effects of local thermal forcing on the anomalous response of the global circulations. The results of numerical experiments indicate that: the thermal distribution of sea-land in the Northern and Soutehrn Hemispheres is advantageous to the intensification of planetary - scale meridional circulations in the Northern and Southern Hemispheres and to the formation of cross - equatorial flows; the thermal forcing of the Australian continent in the Southern Hemisphere may distinctly affects the state of the jet in the northern mid -latitude westerlies through the lateral coupling of easterlies and westerlies; the meridional energy dispersion of 2D Rossby waves may be an important cause for the effects of thermal forcing of the Australian continent on anomalous variations of stationary circulation systems in the Northern Hemisphere, and the propagating paths of meridional wavetrains forced by the Australian thermal forcing are very similar to PNA and EU teleconnection patterns. |
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| Keywords: | Wavetrain Thermal forcing Westerlies Easterlies Two - dimensional Rossby wave |
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