区域尺度选择对区域气候模拟的影响

Effects of Domain Size Choice on the Regional Climate Simulation

通过数值模拟的方法,研究了不同区域尺度设置对气候模拟的影响,结果表明:小区域明显受到外强迫场的束缚,随着区域尺度的增大,模式外部强迫与内部作用达到一定平衡,模拟结果也将逐渐稳定,但是随着模式区域尺度的增大,其内外相互作用难以达成平衡。因此,进行区域气候模拟时,须根据目标区域的情况对模式区域尺度进行仔细选择。对于陕西地区的模拟,选择1700km×2000km的区域尺度设置,模拟的效果最佳。

By using the method of numerical simulation, the effects of different domain size arrangement on the climatic simulation were studied. The results showed that smaller domain size had stronger restrictions from external forcing exerted by large-scale reanalysis field. With the increase of domain size, it kept balance between external forcing and internal forcing. However, the internal forcing was more complex by larger domain size. So the domain size must be carefully selected based on research purpose when some regional climate simulations were done. An intermediate size about 1 700 km × 2 000 km was the best domain size for climate simulation in Shaanxi.