黄海海雾WRF数值模拟中垂直分辨率的敏感性研究
发布时间：2018-08-30 13:10
【摘要】：基于WRF模式探究不同垂直分辨率下模式对黄海海雾的模拟表现。将3种垂直分层方案(35η、44η与63η)和2种边界层方案(YSU、MYNN)组合,对10次海雾做模拟研究。统计分析了水平雾区与雾顶高度对垂直分辨率的敏感性,并利用1次典型个例剖析了雾顶长波辐射与雾体湍流的作用。统计结果显示,提高垂直分辨率能显著改进水平雾区的模拟效果,改善明显的个例在不同垂直分辨率试验下的雾顶高度差异也较大;YSU方案相比于MYNN方案更敏感,从35η层增至44η层其试验个例的击中率(POD)和公正预兆得分(ETS)的平均改进率分别提高了13.29%和10.22%。典型个例研究结果揭示,模式对雾顶长波辐射和雾体湍流作用的模拟程度强烈依赖垂直分辨率:粗垂直分辨率给出的湍流强度很弱,导致模拟失败;雾顶存在"云水含量增多→长波辐射增强→降温加大→云水含量增多"的正反馈过程,细垂直分辨率比粗垂直分辨率更容易维持与增强此反馈;只有细垂直分辨率才能模拟出雾顶长波辐射冷却产生的贯穿雾体直抵海面、强度不弱于近海面机械湍流的浮力湍流,它导致雾体降温而出现符合观测事实的海温高于气温的现象。
[Abstract]:Based on WRF model, the simulation performance of Huang Hai sea fog with different vertical resolution was studied. Three vertical stratification schemes (35 畏 -44 畏 and 63 畏) and two boundary layer schemes (YSU,MYNN) were combined to simulate 10 sea fogs. The sensitivity of horizontal fog zone and height of fog roof to vertical resolution is analyzed statistically and the effect of long wave radiation on fog body turbulence is analyzed by a typical example. The statistical results show that the improved vertical resolution can significantly improve the simulation effect of horizontal fog zone, and the difference of fog top height in different vertical resolution test cases is more sensitive than that of MYNN scheme. From 35 畏 layer to 44 畏 layer, the average improvement rates of (POD) and (ETS) are increased by 13.29% and 10.22%, respectively. The results of typical case studies show that the simulation degree of the model to the effect of long wave radiation on the top of fog and turbulence of fog body depends strongly on the vertical resolution: the turbulence intensity given by the coarse vertical resolution is very weak, which leads to the failure of simulation; There is a positive feedback process of "increasing cloud water content and increasing cloud water content". The fine vertical resolution is easier to maintain and enhance than the coarse vertical resolution. Only the fine vertical resolution can simulate the floating turbulence through the fog body which is generated by the long wave radiation cooling at the top of the fog, and the intensity is not weaker than that of the mechanical turbulence near the sea surface. It causes the fog to cool and the observed SST is higher than the temperature.
【作者单位】： 中国海洋大学物理海洋教育部重点实验室海洋与大气学院;
【基金】：国家自然科学基金(41276009) 海洋公益性行业科研专项(201505007) 天津兴海科技(KJXH2014-20)
【分类号】：P732
本文编号：2213170
[Abstract]:Based on WRF model, the simulation performance of Huang Hai sea fog with different vertical resolution was studied. Three vertical stratification schemes (35 畏 -44 畏 and 63 畏) and two boundary layer schemes (YSU,MYNN) were combined to simulate 10 sea fogs. The sensitivity of horizontal fog zone and height of fog roof to vertical resolution is analyzed statistically and the effect of long wave radiation on fog body turbulence is analyzed by a typical example. The statistical results show that the improved vertical resolution can significantly improve the simulation effect of horizontal fog zone, and the difference of fog top height in different vertical resolution test cases is more sensitive than that of MYNN scheme. From 35 畏 layer to 44 畏 layer, the average improvement rates of (POD) and (ETS) are increased by 13.29% and 10.22%, respectively. The results of typical case studies show that the simulation degree of the model to the effect of long wave radiation on the top of fog and turbulence of fog body depends strongly on the vertical resolution: the turbulence intensity given by the coarse vertical resolution is very weak, which leads to the failure of simulation; There is a positive feedback process of "increasing cloud water content and increasing cloud water content". The fine vertical resolution is easier to maintain and enhance than the coarse vertical resolution. Only the fine vertical resolution can simulate the floating turbulence through the fog body which is generated by the long wave radiation cooling at the top of the fog, and the intensity is not weaker than that of the mechanical turbulence near the sea surface. It causes the fog to cool and the observed SST is higher than the temperature.
【作者单位】： 中国海洋大学物理海洋教育部重点实验室海洋与大气学院;
【基金】：国家自然科学基金(41276009) 海洋公益性行业科研专项(201505007) 天津兴海科技(KJXH2014-20)
【分类号】：P732
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