The Effects of Changes of Earth Orbital Parameters on East Asian Monsoon Simulation
地球轨道偏心率变化对东亚季风气候模拟的影响

The authors developed the calculating method of the earth orbital parameters in a regional climate model and operated 10 years' simulations to compare the influence of changes of earth orbital parameters on modern east Asian monsoon. From these studies, some preliminary conclusions could be drawn as follows: A slight improvement takes place in the precipitation simulation in East China after modified the earth orbital parameters from circle to ellipse in the model. The climate elements, e.g. temperature/precipitation/specific humidity etc., reveal a seasonal variation trends that fall (decrease) in summer and rise (increase) in winter, and the winter/summer monsoon of Asia are weakened. In general, the results of simulation would not be notably affected by change of computing methods of earth orbit parameters. So it is viable to adopt a circle approach in the earth orbit calculation while simulating modern climate in a shorter span.