南京大学学报(自然科学版) ›› 2022, Vol. 58 ›› Issue (5): 750765.doi: 10.13232/j.cnki.jnju.2022.05.002
Jingshi Wang1, Xi Jiang2(), Xidi Zhang3
摘要:
利用1967-2016年中国603个测站降水资料和ERA5的逐小时再分析资料从夜雨量和频次两个角度分析中国夜雨时空变化特征.结果表明:我国存在夜雨现象的站点主要分布在西南部、西北部、黄淮流域、华中地区、京津冀、华南西北部和东北南部,其中,四川、西藏、贵州、新疆和青海夜雨现象最为显著.根据夜雨率的月变化特征,将夜雨现象显著站点分为N型、V型、M型、W型和Λ型,N型主要分布在云贵高原,V型主要分布在青藏高原东麓,M型主要分布在四川盆地.影响N型、V型、M型站点所在区域降水的动力和水汽条件的夜昼差异月变化与对应站点的夜雨率月变化基本一致,N型区域的夜昼差异于春季达到最大,夏季最小,V型区域在夏季最小,冬季最大,M型区域在春季最大.在1967-2016年,夜雨现象显著的地区中,青海诺木洪夜雨现象愈加明显,西藏林芝等地夜雨现象逐渐减弱,这些地区夜雨量比率每十年约变化1%~3%,夜雨频次比率约变化0.4%~1.5%.
中图分类号:
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