CHEN Xiaoxiao,CHENG Zhigang,ZHANG Yueyue.Analysis of the Difference at Day and Night Local Circulation in Winter of Sichuan Basin under the Process of Urbanization[J].Journal of Chengdu University of Information Technology,2020,35(04):464-470.[doi:10.16836/j.cnki.jcuit.2020.04.016]
城市化进程下四川盆地冬季昼夜局地环流的差异分析
- Title:
- Analysis of the Difference at Day and Night Local Circulation in Winter of Sichuan Basin under the Process of Urbanization
- 文章编号:
- 2096-1618(2020)04-0464-07
- Keywords:
- atmospheric sciences; climate change and numerical simulation; Sichuan Basin; urbanization; local circulation; the changes of day and night
- 分类号:
- P463.3
- 文献标志码:
- A
- 摘要:
- 为研究不同城市化阶段四川盆地冬季局地环流的差异,选取四川盆地城市化进程的3个代表时期2005/2006、2010/2011、2015/2016年冬季(以次年1月数据代表)的FNL逐日再分析资料,利用气象统计分析方法,对盆地冬季局地环流进行了城市化昼夜变化特征对比分析。结果表明,冬季四川盆地爬流运动占主导,城市化进程下,绕爬流分量和水平风场减弱,经向垂直运动加强至50 hPa/s以上,高原附近的爬流运动,对山谷风形成有积极作用。湿度场在高原与盆地间有显著差异,相对湿度西低东高,夜晚,盆地相对湿度增加,边界层高度则相反; 城市化进程下,盆地中心干岛加深、边界层高度变化不明显。盆地内绝对涡度为正,且对流层中高层大于低层,城市化进程下绝对涡度增大,夜晚高层辐合作用增强,有利于下沉运动
- Abstract:
- In order to study the differences of local circulation in the Sichuan Basin in different urbanization stages in winter. This paper selects the daily reanalysis data of FNL in the three representative periods of the urbanization process of Sichuan Basin in the winter of 2005/2006, 2010/2011 and 2015/2016(Represented by January data in the following year), the statistical analysis methods of weather are used to compare the characteristics of day and night changes of urbanization in the local circulation of the basin in winter. The results show that the flow over movement is dominant in the winter of Sichuan Basin. Under the urbanization process, the flow over component and the horizontal wind are weakened, and the vertical movement is strengthened to 50 hPa/s or more; The flow over component has a positive effect on the formation of the mountain-valley wind. There are Significant differences of humility between the plateau and the basin, the relative humidity in the east is higher than that in the west. At night, the relative humidity of the basin is significantly increased, but the height of the boundary layer is opposite. Under the process of urbanization, the dry island in the center of the basin is deepened and the height of the boundary layer is not obvious.(3)Absolute vorticity is positive in the basin, and the upper and middle troposphere are larger than the lower. The absolute vorticity increases under the urbanization, and the convergence of the higher level at night is enhanced, which is conducive to the falling movement
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备注/Memo
资助项目:国家科技基础资源调查专项资助项目(2017FY100903),国家自然科学基金资助项目(41971026)