Numerical Simulations of Spatial Distributions and Diurnal Variations of Low-Level Jets in China during Early Summer
Numerical Simulations of Spatial Distributions and Diurnal Variations of Low-Level Jets in China during Early Summer
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DOI：
10.1175/jcli-d-13-00571.1
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发表时间：
2014-07
影响因子：
4.9
通讯作者：
Yueyue Du;Qinghong Zhang;Yi-Leng Chen;Yangyang Zhao;Xu Wang
中科院分区：
文献类型：
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作者：
Yueyue Du;Qinghong Zhang;Yi-Leng Chen;Yangyang Zhao;Xu Wang
摘要利用WRF模式2006-11年逐时观测资料，详细分析了我国初夏（5 - 7月）低空急流的空间分布和日变化特征。研究发现，LLJ频繁发生在中国的以下地区：塔里木盆地，中国东北，青藏高原（TP）和中国南部。将中国上空的低空急流分为两类：边界层急流（1 km以下）和天气系统相关低空急流（1-4 km范围内）。塔里木盆地和塔里木盆地的低层结主要为低层结。华南和东北地区的SLLJ分别与梅雨锋和东北冷涡（NECV）相关联，且各地区的BLJ日变化明显，最大值出现在夜间或清晨，但各地区的SLLJ日变化因位置而异。通过对模式资料的分析，发现BLJ的日变化规律与模式资料一致。
AbstractThe detailed spatial distributions and diurnal variations of low-level jets (LLJs) during early summer (May–July) in China are documented using 2006–11 hourly model data from the Weather Research and Forecasting (WRF) Model with a 9-km horizontal resolution. It was found that LLJs frequently occur in the following regions of China: the Tarim basin, northeastern China, the Tibetan Plateau (TP), and southern China. The LLJs over China are classified into two types: boundary layer jets (BLJs, below 1 km) and synoptic-system-related LLJs (SLLJs, within 1–4 km). The LLJs in the Tarim basin and the TP are mainly BLJs. The SLLJs over southern China and northeastern China are associated with the mei-yu front and northeast cold vortex (NECV), respectively.The BLJs in all regions show pronounced diurnal variations with maximum occurrences at nighttime or in the early morning, whereas diurnal variations of SLLJs vary, depending on the location. From the analysis of model data, the diurnal variation of BLJs i...