任侠,王咏薇,张圳,杨亦辰,胡诚,康汉青. 2017. 太湖对周边城市热环境影响的模拟[J]. 气象学报, ():-, doi:10.11676/qxxb2017.046
太湖对周边城市热环境影响的模拟
Simulation studies for Lake Taihu effect on surrounding cities thermal environment
投稿时间:2016-12-01  最后修改时间:2017-03-24
DOI:10.11676/qxxb2017.046
中文关键词:  WRF模式,浅水湖泊陆面过程,城市热环境,参数化方案耦合
英文关键词:WRF model, Shallow lake land-surface process, Urban thermal environment, coupling of parameterization schemes
基金项目::国家自然科学基金面上项目(41275024、41505005),江苏省自然科学青年项目(BK20150900),江苏高校优势学科建设工程项目(PAPD),中国科学院大气物理研究所大气边界层物理与大气化学国家重点实验室开放课题(LAPC-KF-2014-09)
作者单位E-mail
任侠 南京信息工程大学大气物理学院 renxia89@126.com 
王咏薇 南京信息工程大学大气物理学院耶鲁-南京信息工程大学大气环境中心 wyw@nuist.edu.cn 
张圳 耶鲁-南京信息工程大学大气环境中心 15195819198@163.com 
杨亦辰 耶鲁-南京信息工程大学大气环境中心 837336430@qq.com 
胡诚 耶鲁-南京信息工程大学大气环境中心 nihaohucheng@163.com 
康汉青 南京信息工程大学 大气物理学院 002651@nuist.edu.cn 
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中文摘要:
      太湖微气候条件及局地热环境的研究对于太湖周边城市地区可持续发展以及大气宏观调控具有重要意义。为了更准确的模拟太湖湖气交换,将CLM4-LISSS浅水湖泊陆面过程参数化方案耦合进入WRF中的Noah陆面过程模型。采用太湖湖上平台及岸边陆上测站观测的数据,评估了CLM4-LISSS浅水湖泊过程方案对太湖区域近地层气象条件的模拟性能。并基于耦合模型模拟研究了太湖对周边城市区域热环境的影响。结果表明CLM4-LISSS湖泊陆面过程方案模拟的湖表面温度能反映真实温度的变化趋势。两种陆面过程方案在2m气温的模拟值也存在一定的差异。CLM4-LISSS方案与Noah默认方案计算所得湖上2m气温的模拟值与观测值的平均均方根误差分别为1.77 ℃和2.22℃,平均相关系数分别为0.88、0.84。两种方案模拟10m风速的平均均方根误差分别为1.93 m/s(CLM4-LISSS)、2.78 m/s(Noah),平均相关系数为0.72(CLM4-LISSS)、0.68(Noah)。太湖对周边城市热环境存在明显的影响。8月太湖对周边地区15时近地层平均降温0.5-0.7℃,影响范围达60km。凌晨06时太湖导致周边近地层平均升温可达0.7-1℃,影响范围达50km。湖风带来的冷空气抑制了城市热岛的垂直运动,在高温天气下使得苏州、无锡、常州城市地区昼间边界层下降高度可达300m、400m、100m。无锡地区边界层内气温最高降幅可达0.5-0.7℃。通过选取无锡地区2015年8月28日高温小风天气作为背景条件,分析该地区湖风对城市热岛环流的影响机制。结果表明湖风能够瓦解无锡地区的热岛环流结构,改变近地面热量和水汽的分布,抑制城市热岛的垂直发展,并影响到整个无锡地区。局地热力环流的变化对于局地气候以及污染物质的输送与扩散有可能产生重要影响,准确的湖泊陆面过程参数化方案对于天气预报,空气污染模拟,以及气候模拟研究等都存在重要意义。
英文摘要:
      Abstract: Research on Lake Taihu’s microclimate condition and local thermal environment plays an important role in sustainable development of the surrounding cities and atmosphere macro-control. In order to simulate lake-air interaction in Lake Taihu more precisely, This study couple the CLM4-LISSS shallow lake land-surface process parameterization scheme to the Noah land-surface process model in WRF and evaluate the simulation performance of CLM4-LISSS shallow lake process scheme on the near-surface meteorological conditions in the region of Lake Taihu applying the data from the lake platforms and the land observing stations. Furthermore, on the basis of coupled model simulation, This study analyze the effect of Lake Taihu on surrounding cities thermal environment. The results are as follows: The lake surface temperature simulated by CLM4-LISSS lake surface process scheme can reflect the variation trend of real temperature. The simulated values of the two land surface processes at 2-m temperature also exist some difference. The mean Root Mean Square Error (RMSE) of 2-m temperature between CLM4-LISSSS lake surface scheme and observation value is 1.77 ℃, which is better than Noah default scheme (2.22℃),the correlation coefficients between observation and both lake surface process scheme simulation are 0.88(CLM4-LISSS)、0.84 (Noah) . The 10-m wind speed mean RMSEs and correlation coefficients between observation and both lake surface process scheme simulation are 1.93m/s, 0.72 (CLM4-LISSS) and 2.78m/s, 0.68 (Noah) respectively. Lake Taihu has a significant impact on the thermal environment of the surrounding cities. Lake Taihu surrounding area’s near-surface temperature decreased 0.5-0.7℃ averagely at 3 p.m. in August and influence range is up to 60 km. Near-surface temperature increased 0.7-1℃ averagely at 6 a.m. in August and influence range is up to 50 km. The cold air brought by the lake winds suppresses the vertical movement of the urban heat island. Under the control of hot weather, the urban areas of Suzhou, Wuxi and Changzhou’s average PBL decreased 300m, 400m and 100m respectively in the daytime. The boundary layer’s maximum temperature decrease in the region of Wuxi can reach 0.5-0.7℃. The result reflects that lake wind can disrupt the heat island circulation structure in the region of Wuxi, change the distribution of near-surface heat and water vapor, restrain the vertical development of urban heat island and affect the entire region of Wuxi. The change of local thermal circulation may have a great impact on the local climate and the transport and diffusion of pollutants. The accurate parameterization scheme of lake land-surface process is significant for weather forecasting, air pollution simulation and climate simulation study.
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