南京大学学报(自然科学版) ›› 2014, Vol. 50 ›› Issue (6): 337347.
• • 下一篇
马红云1,2,薛佳庆3,4,江志红1,2,徐海明1,2
Ma Hongyun1,2, Xue Jiaqing3,4, Jiang Zhihong1,2, Xu Haiming1,2
摘要: 本文利用NCAR开发的CAM5.1模式进行了中国东部大规模城市下垫面变化对南海夏季风爆发影响的数值模拟研究。结果表明:CAM5.1模式能够很好地模拟出东亚夏季风系统季节演变过程中大尺度环流场和降水分布的变化。敏感性试验结果表明中国东部大规模城市群的发展会使得南海夏季风提前1侯爆发;控制试验中5月中旬南海地区东南风向西南风的转变,以及降水量激增现象的出现,均较无城市试验中提前。同时,城市化快速发展阶段与南海夏季风爆发的年代际变化存在时间段的吻合,初步推断城市下垫面发展可能是1993年之后南海季风提前爆发的原因之一。对南海季风爆发影响的原因分析可以看出,城市化引起的下垫面物理属性变化,使得从春至夏的季节转变中,东部(110°-120°E)中高纬度陆地对大气的感热加热增强,减小了海陆之间的热力对比,加快陆地低层大气降压,从而引导南海季风提前爆发。
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