The Diurnal Cycle of Precipitation in Regional Spectral Model Simulations over West Africa: Sensitivities to Resolution and Cumulus Schemes
The Diurnal Cycle of Precipitation in Regional Spectral Model Simulations over West Africa: Sensitivities to Resolution and Cumulus Schemes
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DOI：
10.1175/waf-d-14-00013.1
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发表时间：
2015-04
影响因子：
2.9
通讯作者：
Xiaogang He;Hyungjun Kim;P. Kirstetter;K. Yoshimura;E. Chang;C. Ferguson;J. Erlingis;Y. Hong
中科院分区：
文献类型：
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作者：
Xiaogang He;Hyungjun Kim;P. Kirstetter;K. Yoshimura;E. Chang;C. Ferguson;J. Erlingis;Y. Hong
作为气候模式的一种基本形式，降水日循环(DCP)可以为模式的可靠性和发展提供关键的试验台。本研究利用美国国家环境预报中心(NCEP)的区域谱模式(RSM)模拟了2005年4-9月季风季期间西非的DCP。对单层简化Arakawa-Schubert(SAS)、多层松弛Arakawa-Schubert(RAS)和新Kain-Fritsch(Kf2)三种对流参数化方案(CPSS)在两个水平分辨率(20和10 km)下进行了对比分析。贝宁中尺度站点被挑选出来，用于对分辨率影响的额外调查。用谐波分析表征了DCP的相位和幅值。与卫星观测相比，能够很好地捕捉到区域尺度上的总的振幅空间分布。RSM很好地再现了观测到的陆地上傍晚的峰值和海洋上的清晨峰值。尽管如此，高峰期还很早。
AbstractAs a basic form of climate patterns, the diurnal cycle of precipitation (DCP) can provide a key test bed for model reliability and development. In this study, the DCP over West Africa was simulated by the National Centers for Environmental Prediction (NCEP) Regional Spectral Model (RSM) during the monsoon season (April–September) of 2005. Three convective parameterization schemes (CPSs), single-layer simplified Arakawa–Schubert (SAS), multilayer relaxed Arakawa–Schubert (RAS), and new Kain–Fritsch (KF2), were evaluated at two horizontal resolutions (20 and 10 km). The Benin mesoscale site was singled out for additional investigation of resolution effects. Harmonic analysis was used to characterize the phase and amplitude of the DCP. Compared to satellite observations, the overall spatial distributions of amplitude were well captured at regional scales. The RSM properly reproduced the observed late afternoon peak over land and the early morning peak over ocean. Nevertheless, the peak time was early...