| 摘要: |
| 【 目的】为探究南岭山脉对郴州地区近地面气象场模拟的影响。【方法】使用 WRF(Weather Research and Fore- casting)模式对郴州地区 2023 年 10 月 18—20 日的 1 次降水天气过程进行了模拟，通过不同高度及精度的地形敏感性试验对 比分析。【结果】南岭山脉的特殊地形是导致郴州地区 2 m 温度和 2 m 相对湿度空间分布差异的直接原因之一；中低层西南 暖湿气流受到南岭山脉特殊地形的阻挡抬升、绕行辐合和狭管效应影响，产生了明显有利于对流发展和维持的流场结构，使 降雨更容易在此处发展，升高或降低地形均会破坏这种特征结构，使该处降雨减弱和雨带位置改变；使用更高分辨率的地形 数据可以更好地代表郴州地区真实的地形特征，从而提高模式模拟的准确率。【结论】南岭地形和郴州地区气象场的变化关 系密切，南岭复杂地形也是造成郴州独特气候特征的主要原因之一。 |
| 关键词: WRF 模式；南岭山脉；郴州市；近地面气象场；敏感性实验 |
| DOI： |
| 投稿时间：2024-03-10修订日期：2024-08-01 |
| 基金项目:郴州市气象局科研业务项目(CZQXKJ2023-A01) |
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| Impact of Nanling Mountain Range on Numerical Simulation of Near-surface Meteorological Field in Chenzhou |
| ZHANG Chenwei,CHEN Wei,CAO Luxia,LI Boyong,HUANG Guansheng,DENG Siyu |
| (Chenzhou Meteorological Office of Hunan Province;Xi’an Technological University) |
| Abstract: |
| To understand the impact of Nanling Mountain Range on numerical weather prediction , the WRF (Weather Research and Forecasting) model is used to simulate one precipitation event that occurred in Chenzhou from October 18 to 20 , 2023 . The comparison between default and changed ( different altitudes and resolutions) terrain data is investigated through numerical sensitivity tests to analyze the impact on near-surface meteorological field simulations . The results show that the special terrain of Nanling Mountain Range is one of the direct causes for the spatial distribution differences in 2 m temperature and 2 m relative humidity in Chenzhou . The mid- and low- level southwest warm and humid airflow is influenced by the blocking and lifting effect , the convergence due to terrain deflection , and the channeling effect of the special terrain of the Nanling Mountain Range . This creates a flow field structure that is favorable for the development and maintenance of convection , facilitating the occurrence of rainfall in this region . Any alteration in the numerical sensitivity tests of terrain , either raising or lowering it , would disrupt this characteristic structure and lead to weakened rainfall and a shift in the position of the rain band . Using higher resolution terrain data can better represent the true terrain characteristics of the Chenzhou , thereby improving the accuracy of model simulation . In a word , the terrain of the Nanling Mountain Range and the changes in the weather field in Chenzhou are closely related . The complex terrain of Nanling is also one of the main reasons for the unique climate features of Chenzhou . |
| Key words: WRF model; Nanling Mountain Range; Chenzhou City; meteorological field; sensitivity test |
