On the role of resolution and topography in the simulation of East Asia precipitation
On the role of resolution and topography in the simulation of East Asia precipitation
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DOI：
10.1007/s00704-005-0214-4
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发表时间：
2006-09-01
影响因子：
3.4
通讯作者：
Giorgi, F.
中科院分区：
文献类型：
--
作者：
Gao, Xuejie;Xu, Ying;Giorgi, F.
本文研究了水平分辨率在东亚降水模拟中的作用。利用区域气候模式（RegCM2）与CSIRO全球海气耦合模式进行了两组数值试验。在第一组中，我们使用实际的RegCM2地形在选定的模型分辨率，这是45，60，90，120，180，240和360公里。在第二组实验中，在使用第一组的不同分辨率的所有模拟中使用相同的粗CSIRO模型地形。结果表明，随着水平分辨率的提高，模式对东亚降水的模拟效果得到改善。此外，它示出了使用较高的分辨率沿着与粗CSIRO地形的模拟比使用相应的模型地形的粗糙模型分辨率的模拟执行得更好。这表明，在东亚地区，足够的空间分辨率来解决物理和动力过程比地形更重要。最后，模拟结果表明，要准确地模拟中国和东亚地区的降水分布，模式的分辨率需要达到60 km或更高。
In this paper, we investigate the role that horizontal resolution plays in the simulation of East Asia precipitation. Two sets of numerical experiments are performed using the Regional Climate Model (RegCM2) nested in one-way mode within the CSIRO global coupled atmosphere-ocean model. In the first set we use the actual RegCM2 topography at the selected model resolutions, which are 45, 60, 90, 120, 180, 240 and 360km. In the second set of the experiments, the same coarse CSIRO model topography is used in all simulations using the different resolutions of the first set. The results demonstrate that the simulation of East Asian precipitation improves as the horizontal resolution is increased. Moreover, it is shown that the simulations using a higher resolution along with the coarse CSIRO topography perform better than the simulations using a coarser model resolution with corresponding model topography. This suggests that over East Asia adequate spatial resolution to resolve the physical and dynamical processes is more important than topography. Lastly, the results indicate that model resolutions of 60km or higher are needed to accurately simulate the distribution of precipitation over China and East Asia.