Climate change modes between East Asia and southwestern North America are interlinked; however, little research has been done in comparing the underlying mechanisms between time scales. Here we present a comprehensive study using modern observations, paleoclimate records, and PMIP3/CMIP5 simulations to investigate the multi-timescale wet/dry changes in East Asia and southwestern North America and its relationship in climate change modes since the Last Glacial Maximum. Results show that wet/dry conditions in the monsoon and non-monsoon regions of East Asia and southwestern North America all have reverse changes at different timescales. On the millennial-scale the two continents are linked through the factors of insolation, greenhouse gas concentrations, El Niño-Southern Oscillation, and the northern hemisphere ice sheet. On the modern interannual and interdecadal scales the two climate systems are interlinked through the atmosphere-ocean interaction and precipitation and temperature patterns of both continents. This study provides a new perspective for the linkage study between different continents on a long-term scale, as well as a new recognition to global monsoon system.

东亚和北美西南部之间的气候变化模式是相互联系的；但是，在比较时间尺度之间的潜在机制方面，几乎没有进行任何研究。在这里，我们使用现代观测，古气候记录和PMIP3 / CMIP5模拟进行了全面的研究，以调查自上次冰川期以来东亚和北美西南部的多时尺度湿/干变化及其与气候变化模式的关系。结果表明，东亚和北美西南部的季风和非季风区的湿/干条件在不同的时间尺度上都有相反的变化。在千禧年尺度上，这两个大陆是通过日晒，温室气体浓度，厄尔尼诺-南方涛动和北半球冰盖等因素联系在一起的。在现代的年际和年代际尺度上，两个气候系统通过大气-海洋相互作用以及两大洲的降水和温度模式相互联系。这项研究为长期研究不同大陆之间的联系提供了新的视角，也为全球季风系统提供了新的认识。