WRF模式对黄土高原丘陵地形条件下夏季边界层结构的数值模拟

被引:25
作者
王腾蛟 [1 ]
张镭 [1 ]
胡向军 [1 ,2 ]
赵世强 [1 ,3 ]
王瑾 [1 ]
机构
[1] 半干旱气候变化教育部重点实验室/兰州大学大气科学学院
[2] 兰州中心气象台
[3] 中国人民解放军部队
关键词
WRF模式; 边界层参数化方案; 黄土高原; 潜热通量; 感热通量;
D O I
暂无
中图分类号
P461 [气候的形成和影响气候的因素];
学科分类号
摘要
利用中尺度数值模式WRF提供的两种边界层参数化方案(YSU和MYJ方案),选取2009年7月27-29日作为夏季个例,对黄土高原丘陵地形条件下大气边界层结构及地表能量场特征进行了较为细致的模拟研究。结果表明,WRF模式较好地模拟出黄土高原夏季边界层结构的日变化及近地面温度场、风场、净辐射通量、感热通量和潜热通量等要素的变化特征。WRF模式对温度的模拟最好,相关系数达到了0.95,对风速的模拟则较差,这与风场本身的随机多变性有很大的关系;WRF模式提供的土地利用类型、土壤类型以及NCEP提供的初始场土壤湿度与实际不符,是造成白天地表能量场模拟效果较差的主要原因;黄土高原半干旱区对流边界层最大高度可达到2 500m,夜间稳定边界层高度可达到700m左右。两种方案的对比分析表明,加入了非局地混合作用以及边界层顶夹卷作用的YSU方案能更好地模拟出对流边界层结构特征,而MYJ局地闭合方案则对稳定边界层的模拟表现更优。
引用
收藏
页码:1261 / 1271
页数:11
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