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WRF模式短期高温天气模拟对陆面方案的敏感性

, PP. 1375-1384

Keywords: WRF模式,高温天气,陆面方案,敏感性试验

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Abstract:

?利用中尺度模式WRFV2.2及NCEP再分析资料,以24h短期天气模拟的方式,模拟了我国2003年7月下旬江南及华南地区的高温天气,检验了模拟高温对不同陆面方案的敏感性.结果表明,模式总体上能模拟出≥35℃的气温分布形势,但模拟高温对不同陆面方案比较敏感,在模拟强度、TS评分及误差上存在较大差异,如从评分来看,SLAB方案模拟最好,RUC次之,NOAH再次之;不同陆面方案能模拟出方案之间的系统性差异,如三个方案中SLAB方案模拟平均绝对误差最小,模拟低层西太平洋副热带高压脊线最为偏东;不同的陆面方案主要通过模拟地表感热通量的变化影响地面气温变化,由不同方案引起的环流变化与地面气温变化之间的正反馈机制不重要,甚至在主要高温区存在“负”反馈.改进陆面方案对提高地面气温的数值预报能力具有重要意义.

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