Influence of Monsoonal Wind Speed and Moisture Content on Intensity and Diurnal Variations of the Mei-Yu Season Coastal Rainfall over South China
Influence of Monsoonal Wind Speed and Moisture Content on Intensity and Diurnal Variations of the Mei-Yu Season Coastal Rainfall over South China
复制标题
季风风速和含水量对华南梅雨季沿海降雨强度和日变化的影响
DOI：
10.1175/jas-d-17-0081.1
复制
发表时间：
2017
影响因子：
3.1
通讯作者：
Zhao, Kun
中科院分区：
文献类型：
--
作者：
Chen, Xingchao;Zhang, Fuqing;Zhao, Kun
利用气象研究与预报（WRF）模式进行了对流条件下的数值试验，探讨了梅雨季节季风陆上风速和湿度对华南沿海降水强度和日变化的影响。分析的重点是两个10天的WRF模拟，模拟了2007-09梅雨季节高风速日和低风速日的平均横向边界条件。尽管在降雨强度上存在差异，但两种模拟的降雨空间分布和日变化在质量上与地面雷达观测得出的平均估计相吻合，分别在大风日和低风日进行平均。敏感性试验表明，沿海地区降水空间分布格局主要受环境陆上风速控制。在大风天气，沿海强降雨集中在海岸线，并在清晨达到最大值。差异表面摩擦和小山丘引起的海岸抬升是强海岸降水的主要原因，而陆风增强了傍晚至清晨的海岸抬升和降水。在低风日，沿海降水主要受陆海风锋面的影响，该锋面垂直于海岸线有明显的日传播。陆海温差越强，低风日陆海微风越强。在大风日和低风日，沿海降水强度对上游海洋气流的来袭水汽较为敏感，特别是对边界层的水汽含量较为敏感。
Convection-permitting numerical experiments using the Weather Research and Forecasting (WRF) Model are performed to explore the influence of monsoonal onshore wind speed and moisture content on the intensity and diurnal variations of coastal rainfall over south China during the mei-yu seasons. The focus of the analyses is on a pair of 10-day WRF simulations with diurnally cyclic-in-time lateral boundary conditions averaged over the high versus low onshore wind speed days of the 2007–09 mei-yu seasons. Despite differences in the rainfall intensity, the spatial distributions and diurnal variations of rainfall in both simulations verified qualitatively well against the mean estimates derived from ground-based radar observations, averaged respectively over either the high-wind or low-wind days.Sensitivity experiments show that the pattern of coastal rainfall spatial distribution is mostly controlled by the ambient onshore wind speed. During the high-wind days, strong coastal rainfall is concentrated along the coastline and reaches its maximum in the early morning. The coastal lifting induced by the differential surface friction and small hills is the primary cause for the strong coastal rainfall, while land breeze enhances coastal lifting and precipitation from evening to early morning. In the low-wind days, on the other hand, coastal rainfall is mainly induced by the land–sea-breeze fronts, which has apparent diurnal propagation perpendicular to the coastline. With stronger land–sea temperature contrast, the land–sea breeze is stronger during the low-wind days. Both in the high-wind and low-wind days, the coastal rainfall intensity is sensitive to the incoming moisture in the upstream oceanic airflow, especially to the moisture content in the boundary layer.
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