, region of westerly belt, region of plateau and region of East Asian monsoon.Water vapor is transported from Northwest and West and Southwest to Northwest China.

• 结果表明：受不同气候系统影响的西北地区可划分为西风带、高原区与东亚季风等3个气候影响区，水汽沿西北、西方与西南3条路径输送到西北地区；