| 基于MODIS的安徽省代表城市热岛效应时空特征 |
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| 引用本文： | 石涛,杨元建,马菊,张丽,罗苏丰.基于MODIS的安徽省代表城市热岛效应时空特征[J].应用气象学报,2013,24(4):484-494. |
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| 作者姓名： | 石涛 杨元建 马菊 张丽 罗苏丰 |
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| 作者单位： | 1.安徽省芜湖市气象局，芜湖 241000 |
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| 基金项目： | 资助项目：国家自然科学基金项目(41205126)，中国科学院大气成分与光学重点实验室开放课题（JJ1102） |
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| 摘 要： | 利用2001—2010年覆盖安徽省的MODIS数据，选取在气候、地理、城市化等方面具有代表性的合肥、芜湖、阜阳作为研究对象，并结合GIS技术，分析地表温度的日变化及季节变化特征，得到安徽省代表城市热岛效应的时空分布。结果表明:安徽省省会合肥的热岛效应最为显著，安徽省南部代表城市芜湖的热岛效应强于北部代表城市阜阳, 同时具有显著的日变化和季节变化特征。近10年来，安徽代表城市热岛面积和热岛强度均呈增加趋势，但合肥热岛强度大于3 ℃的极端热岛效应有一定缓解。白天大片水体对缓解城市的热岛效应作用明显，而夜晚则不明显，甚至成为地表温度的高值中心。夏季地表温度与归一化植被指数的负相关最显著，即提高城市植被覆盖度对降低地表温度和缓解城市热岛效应有重要影响。
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| 关 键 词： | MODIS 地表温度 热岛效应 |
| 收稿时间： | 2012-10-17 |
Spatial temporal Characteristics of Urban Heat Island in Typical Cities of Anhui Province Based on MODIS |
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| Shi Tao,Yang Yuanjian,Ma Ju,Zhang Li and Luo Sufeng.Spatial temporal Characteristics of Urban Heat Island in Typical Cities of Anhui Province Based on MODIS[J].Quarterly Journal of Applied Meteorology,2013,24(4):484-494. |
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| Authors: | Shi Tao Yang Yuanjian Ma Ju Zhang Li and Luo Sufeng |
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| Institution: | 1.Wuhu Meteorological Administration of Anhui Province, Wuhu 2410002.Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 2300313.Key Laboratory of Atmospheric Sciences and Satellite Remote Sensing of Anhui Province, Anhui Institute of Meteorological Sciences, Hefei 230031 |
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| Abstract: | Anhui Province is a place with great economic development and potential that lies in the hinterland of the Yangtze River Delta. The topography and climate of Anhui Province present obvious variousness, which can be divided into three natural regions: North China plain, Jianghuai hills and mountain areas of south Anhui. Anhui Province covers an area of 139600 km2. The population of Anhui Province reaches 68.62 million by the end of 2010. Since the 1990s, great changes have happened in Anhui Province, e.g., the tremendous growth of urban sprawl, population, vehicles and economy. In recent years, great increase in urban heat island (UHI) intensity also takes place in the areas with the most rapid urbanization due to fast economic growth and the increasing desire of people for an urban lifestyle. Hefei, the capital of Anhui Province, locating between the Yangtze River and the Huaihe River with hilly terrain, the non-rural area population and urban built-up area of which reaches 1800000 and 326 km2 in 2010, respectively. Wuhu, the economic center of southern Anhui, locating to the south of the Yangtze River with mountainous terrain, the non-rural area population and urban built-up area of which are respectively 950000 and 135 km2 in 2010. Fuyang, the economic center of northern Anhui, locating to the north of Huaihe River with a flat sub-layer, the non-rural area population and urban built-up area of which are 490000 and 76 km2 in 2010, respectively. Land surface temperature (LST) retrieved from MODIS data is used to explore the characteristics of urban heat island (UHI) in Province during 2001 to 2010. Considering some factors (climate, geography and urbanization), three cities mentiened above are first selected to study the UHI. Moreover, diurnal and seasonal variations of LST in these cities are captured by MODIS with GIS technology. Finally, spatial-temporal characteristics of urban heat island are analyzed in representative cities of Anhui Province. The result shows that the heat island effect of Hefei is the most significant. The intensities of UHI in representaty cities of Anhui is stronger in the south area than in the north. Especially, diurnal and seasonal characteristics presented significantly. In recent 10 years, the UHI area and UHI intensity in representative cities maintain increasing tendency, while the extreme UHI intensity (more than 3 ℃) has a weaker enhancement in Hefei. Large bodies of water have a significant role in weakening the city heat island effect in daytime, while have no impacts on UHI effect in nighttime, even becoming high value center of LST. LST and NDVI show significant negative correlation in summer, so it is very important for improving vegetation coverage of the city to reduce land surface temperature and weaken the effects of UHI. |
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| Keywords: | MODIS land surface temperature urban heat island |
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