干旱半干旱气候条件下夏季地表城市热岛特征与影响因素

发布时间：2019-03-09 15:22

【摘要】：利用MODIS土地利用产品提取城市建成区和郊区,以2013年6、7、8三个月的MODIS地表温度产品以及植被覆盖产品分析夏季甘肃省内干旱半干旱气候条件下的地表城市热岛特征,讨论影响地表城市热岛的主要因素。结果表明,在干旱半干旱气候条件下,地表城市热岛具有显著的昼夜差距与区域特点,表现为夜晚地表城市热岛强度大于白天;城市周围的农田、草地等生态屏障可以避免建成区地表被荒漠裸地直接包围,对于控制地表城市热岛具有重要作用。传统计算城郊温度差的方法对于衡量干旱半干旱气候条件下的地表城市热岛具有明显局限性;影响地表城市热岛的主要因素在一天中会产生变化,城郊植被覆盖度差异与夏季白天的地表城市热岛有显著相关性,夜晚地表城市热岛则可能与人类活动强度和人为热源排放有关。
[Abstract]:MODIS land-use products were used to extract urban built-up areas and suburbs to analyze the characteristics of surface urban heat islands under arid and semi-arid climate conditions in Gansu Province in summer with MODIS surface temperature products from 6,7,8 months of 2013, and vegetation cover products for analysis of the characteristics of urban heat islands under arid and semi-arid conditions in summer in Gansu Province. The main factors affecting the heat island of the surface city are discussed. The results show that, in arid and semi-arid climate, the urban heat island has obvious diurnal difference and regional characteristics, which shows that the intensity of urban heat island at night is greater than that in daytime. The ecological barriers around the city, such as farmland, grassland and so on, can prevent the surface from being surrounded by desert bare land directly, which plays an important role in controlling the urban heat island on the surface of the city. The traditional method of calculating the temperature difference in suburb has obvious limitation to measure the surface city heat island in arid and semi-arid climate. The main factors that affect the surface city heat island will change in one day, and the difference of vegetation coverage in suburban area has significant correlation with the surface city heat island in summer day. At night, the surface city heat island may be related to the intensity of human activity and anthropogenic heat source emissions.
【作者单位】：兰州大学资源环境学院;
【基金】：国家自然科学基金(41271184) 中央高校基本科研业务费专项资金(LZUJBKY-2014-209)资助
【分类号】：X16

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