LI Zhao-jie,ZENG Sheng-lan.The Research of Heat Island Effect in Chengdu based on WRF Model[J].Journal of Chengdu University of Information Technology,2016,(06):629-636.
基于WRF模式的成都地区热岛效应的模拟研究
- Title:
- The Research of Heat Island Effect in Chengdu based on WRF Model
- 文章编号:
- 2096-1618(2016)06-0629-08
- 分类号:
- P468.0+21
- 文献标志码:
- A
- 摘要:
- 为探讨成都地区热岛效应的形成机制,利用WRF模式对2008年7月5～6日成都地区的热岛效应进行了模拟,通过对城市下垫面与非城市下垫面2 m高温度、能量及其辐射的对比分析来揭示成都地区热岛效应的时空特征及形成机制。结果表明:成都地区存在2 ℃左右的热岛效应; 城市下垫面的存在改变了成都地区能量平衡,潜热通量的减少导致能量以感热的形式加热大气,且城市下垫面热容量的减少使得感热通量与土壤热通量增加,导致城市地区温度高于郊县农田地区; 城市地区地表反照率的减少,使得城市地区反射出去的短波辐射减少,更多的能量汇集,且夜晚较高的向上长波辐射为辐射冷却提供能量,从而导致城市地区夜晚温度降低速度低于农田,因此,白天升温速率大于农田地区。
- Abstract:
- In order to study the formation mechanism of the urban heat island effect in Chengdu area, the heat island effect during July 5th to 6th in 2008 was simulated by using WRF model. To illustrate the spatial and temporal characteristics of heat island effect in Chengdu area and its formation mechanism, 2 m height temperature, energy and radiation above urbanunderlying surface were comparedwith that above nature underlying surface. The results showed that heat island effect in Chengdu was obvious, and the temperature difference between urban and nature area was about 2 ℃. The energy balance changed because of the change of natural area into urban underlying surface. The decreasing of latent heat flux led to the change of the way to heat the atmosphere,in other words, the atmosphere was heated by sensible heat. Due to reduced thermal capacity because of urban underlying surface, sensible heat flux and soil heat flux increased, which might result in the higher temperature in city than that in suburban area. Surface albedo decreasedin urban areas, which wouldcause the reduction of reflect shortwave radiation in urban areas, and more energy were stored in the air, meanwhile, higher upward longwave radiation at night could provide energy for radiation cooling, and it would result in the lower decreasing rate of night temperature in urban areas than that in the farmland, so the daytime heating rate was greater than that in the farmland area.
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备注/Memo
收稿日期:2016-04-26 基金项目:自然科学基金青年科学基金资助项目(41505122); 四川省科技厅资助项目(2015GZ0238); 四川省教育厅资助项目(13ZB0075); 四川省环境保护科技重大专项资助项目(2013HBZX01)