Hadley环流数模所用的假设之一——简化的经向运动方程精度的估计

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THE ACCURACY OF THE GRADIENT BALANCE

摘要: 利用具有二阶精度的中央差分格式和美国环境预报中心提供的2.5°×2.5°(经纬距)网格资料,对Hadley环流数值模拟中采用的局地和全球纬向平均的简化经向运动方程的精度进行检验。结果表明在热带地区(30°N～30°S),局地气压梯度力、柯氏力和离心力三者代数和的绝对值(余差)在风速中心和气压梯度力中心重合区比较小,在气压场向风场调整过程中比较大。在所选的冬夏两个时刻余差没多大差别,高低层余差也没有显著差异。全球纬向平均的简化经向运动方程精度检验结果证明中高纬地区以地转风平衡为主,低纬以该简化关系为主。
- Hadley环流 /
- 数值模拟 /
- 诊断分析
Abstract: The assumption of the gradient balance is tested with the 2.5°×2.5°NCEP Reanalysis data and central difference scheme. The results show that for the local case,the residual is relatively small within the area where the center of pressure gradient overlaps the center of wind.The relatively large residual can be found in the area undergoing pressure adjustment to the wind. For the case of global-zonal average,the results confirm that geotropic approximation is applicable in higher latitudes and the gradient balance approximation in lower latitudes.
- Hadley circulution /
- numerical simulation /
- diagnostic analysis

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