Acta Geographica Sinica ›› 1993, Vol. 48 ›› Issue (5): 394-402.doi: 10.11821/xb199305002

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NUMERICAL SIMULATION OF INFLUENCE OF ANTARCTIC LAND ICE-SNOW COVER DISAPPEARANCE ON ATMOSPHERIC GENERAL CIRCULATION AND CLIMATE

Yang Xiuqun1, Xie Qian2, Huang Shisong1   

  1. 1. Department of Atmospheric Sciences, Nanjing University 210008;
    2. Meteorological Institute of Air Force, Nnajing 211101
  • Online:1993-09-15 Published:1993-09-15

Abstract: By using a perpetual July,nine-level general circulation spectral model with rhomboidal truncation at wavenumber 15,incorporated with a comprehensive set of physical processes,two numerical experiments,i. e. one with normal Antarctic land ice-snow cover and the other without Antarctic land ice-snow cover,were conducted to study the influence of the removal of Antarctic land ice-snow cover on general circulation of atmosphere and global climate. The results exhibit that the removal of Antarctic land ice-snow cover may induce global atmospheric anomalies, which is characterized by}l)The increase of air temperature with a maximum abnormal center ex- ceeding 6. 0 degree in the Antarctic land areas and the weakening of Antarctic polar vortex and westerlies at the high latitudes of Southern Hemisphere,2)The anomalies of ultra-long waves es-pecially those at wavenumber 3 in the Southern Hemisphere,3)The intensification of summer monsoon circulation of east Asia and the weakening of equatorial Walker circulation,4 ) The in-crease of precipitation over east Asia and the coast areas and the decrease of that over equatorial western Pacific,5)The exciting of the two leading wavetrains of the east Asian and the Eurasian patterns in the Northern Hemisphere,6)Climatic anomalies in China with decrease of air tempera-ture in northeastern China and with increase of precipitation in southern China. Therefore,the Antarctic land ice-snow cover plays an important role in the formation of general circulation and climate. The removal of it may lead a serious consequence for global climate. The dynamical mechanism of climatic effect of Antarctic land ice-snow cover is also discussed in this paper.

Key words: Antarctic land ice-snow cover, climate anomalies, numerical simulation