Simulations of the Summer Circulation over the South American Region with an Eta Coordinate Model
Simulations of the Summer Circulation over the South American Region with an Eta Coordinate Model
复制标题
用Eta坐标模型模拟南美地区夏季环流
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
P. Dias
中科院分区：
文献类型：
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作者：
S. Figueroa;P. Satyamurty;P. Dias
用ETA坐标下的多层有限区域原始方程模式模拟了亚马逊潜热源和安第斯地形对南美地区夏季(12月、1月、2月)环流的影响。观测到的对流层上层玻利维亚高压和巴西东北部沿海低槽、从亚马孙南部向西北向东南延伸的南大西洋辐合带(SACCZ)进入大西洋，以及低层南太平洋和南大西洋的副热带高压等环流特征都得到了很好的模拟。尽管仅靠加热就会产生SACZ，但山脉和基本气流使其处于观察到的位置。研究发现，每天有规律的加热脉冲对于维持SACZ是必要的。Sacz的位置和强度从无山情况到有山情况发生了较大的变化，从而说明了影响的重要性。
Abstract A multilevel limited-area primitive equations model in eta coordinate is used to simulate the effects of the Amazonian latent heat source and the Andean topography on the summer (December, January, February) circulation over the South American region. The observed circulation features, such as the Bolivian high and the trough near the coast of Northeast Brazil in the upper troposphere, the elongated South Atlantic convergence zone (SACZ) oriented northwest to southeast from the southern Amazon region into the Atlantic Ocean, and the subtropical anticyclones in the South Pacific and South Atlantic Oceans in the lower levels are well simulated. Although heating alone produces the SACZ, the mountain and the basic flow put it in the observed position. It is found that regular daily pulses of heating are necessary for the maintenance of the SACZ. The position and intensity of the SACZ change rather substantially from the no-mountain case to the mountain case, thus showing the importance of the effect ...