| 盆地城市地气温差变化特征及模拟研究——以成都市为例 |
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| 引用本文： | 杨巨佳,王超,肖天贵,等.盆地城市地气温差变化特征及模拟研究——以成都市为例[J].高原山地气象研究,2018,38(4):71-75. |
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| 作者姓名： | 杨巨佳 王超 肖天贵 等 |
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| 作者单位： | 成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室, 成都 610225 |
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| 基金项目： | 四川省科技厅项目(19YYJC1204,18YYJ0964,2018SZ0287),四川省教育厅基金(2017Z048),国家自然科学基金(41305076) |
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| 摘 要： | 地气温差对大气边界层热力交换起着极为重要的作用，对局地气候、城市边界层结构和大气污染有着重要影响，因此有必要对城市下垫面地气温差进行相应研究。本文以典型盆地城市成都为例，利用2014年成都市地表温度、气温逐时观测资料分析了该地区地气温差的变化特征，讨论了中尺度数值模式WRF (Weather Research and Forecasting Model)对盆地城市地气温差的模拟能力。结论表明:成都市平均地气温差为2.20℃，多分布在0～2℃区间，与地表温度和气温变化不同，温差春季最大，夏、冬季次之，秋季最小；各季节温差日变化大致相似，均为中午较大，夜间在0℃左右，但极值大小不同。利用WRF对成都市典型夏季晴天地气温差进行了模拟研究，对比分析三种常用陆面过程参数化方案的模拟结果，三种方案模拟的变化趋势均与观测吻合，其中Noah方案能较好的模拟成都市地气温差的变化特征，通过参数化方案的组合方式，改进了模式对地气温差的WRF模拟能力。
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| 关 键 词： | 盆地城市 地气温差 数值模拟 WRF |
| 收稿时间： | 2018-10-21 |
Variation Characteristics of the Difference between Land Surface and Air Temperature and Numerical Simulation on Basin Urban Underlying Surface,a Case Study of Chengdu |
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| Affiliation: | College of Atmospheric Sciences, Chengdu University of Information Technology, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China |
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| Abstract: | The difference between land surface and air temperature (simply as Ts-Ta) plays an important role in the heat exchange of the atmospheric boundary layer. Therefore, it’s necessary to study the Ts-Ta. By utilizing the observation data of temperature in Chengdu in 2014, this article analyzed the characteristics of the variation of the Ts-Ta, and the simulation ability of the numerical model WRF(Weather Research and Forecasting Model)on the Ts-Ta in the typical basin city, Chengdu, is discussed. The results showed that the Ts-Ta in Chengdu was 2.20℃, mostly distributed between 0-2℃. The maximum Ts-Ta was in spring, followed by summer, winter, and autumn. The diurnal variations of Ts-Ta in different seasons were similar; however, the amplitude was different. The numerical model WRF was used to simulate the Ts-Ta between the typical sunny days in Chengdu. The simulation results of three common land surface process parameterization schemes were compared and analyzed. The variation trend of the three parameterized schemes was consistent with the observation, and the Noah scheme can better simulate the variation characteristics of the temperature difference in Chengdu. By combination of schemes, the simulation ability of ground temperature difference was improved. |
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