基于FY-3卫星数据的西安市城市热岛特征分析
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引用本文:金丽娜,李雄飞,杜萌萌,等..基于FY-3卫星数据的西安市城市热岛特征分析[J].气象与环境科学,2019,42(4):74-82.Jin Li’na,Li Xiongfei,Du Mengmeng,et al..Analysis on the Characteristics of Urban Heat Island in Xi’an Based on FY 3 Satellite Data[J].Meteorological and Environmental Sciences,2019,42(4):74-82.
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作者单位
金丽娜,李雄飞,杜萌萌,等.  
DOI:doi:10.16765/j.cnki.1673-7148.2019.04.011
基金项目:
中文摘要:基于2011-2017年FY-3B/VIRR气象卫星影像数据及同期气象观测数据,应用改进型贝克尔(Becker)“分裂窗”地表温度反演算法计算地表温度,根据土地利用类型数据进行城郊对比,分析了西安市春、夏、秋三个季节城市热岛总面积、强热岛面积和热岛比例指数。结果表明:1)遥感反演温度与气象站点监测数据变化趋势基本一致,三季地表温度基本以西安市城区为中心呈环状递减;2)各季节强热岛面积占比年际变化明显,夏季强热岛面积占比远高于春、秋两季的,是后者的2倍以上;3)春、夏、秋三季强热岛区域主要集中在西安市城区和长安区,临潼区、长安区、鄠邑区、西安市城区夏季热岛面积占总面积的50%以上,周至县、高陵区的较小;4)总热岛比例指数总体上波动较大,年际上2016年的最大;春、夏季2014年的最大,秋季2016年的最大;总体城郊热岛差异2017年的最大,季节性城郊热岛差异表现为春季2016年的最大,夏、秋季2017年的最大,夏季城郊热岛差异明显高于春、秋季的。
中文关键词:F-3  地温反演  城市热岛  时空变化特征
 
Analysis on the Characteristics of Urban Heat Island in Xi’an Based on FY 3 Satellite Data
Abstract:On the basis of the FY-3B/VIRR satellite image data and meteorological observations from 2011 to 2017 in Xi’an, the land surface temperature retrieval is realized by using the improved Becker “split window” surface temperature inversion algorithm. Besides, according to land use type data, the characteristics of total area of urban heat island (UHI), area of high intensity UHI and UHI ratio index in spring, summer and autumn are analyzed. The results show that: 1)The changing trends of the retrieved and observed temperatures are basically consistent. Taking the urban area of Xi’an as the center, the surface temperature has a ringlike decreasing trend in spring, summer and autumn. 2)The proportion of area of high intensity UHI has an obvious interannual variation with season, and it is twice higher in summer than in spring and autumn. 3)In spring, summer and autumn, the area of high intensity UHI is concentrated in the urban area and Chang’an District of Xi’an City. In summer, the area of UHI in Lintong District, Chang’an District, Huyi District and urban area of Xi’an accounts for more than 50% of the total area, but it is relatively small in Zhouzhi County and Gaoling County. 4)The total UHI ratio index of Xi’an City fluctuates greatly on the whole, with the largest interannual variation seen in 2016. For spring and summer, the largest UHI ratio index appears in 2014, but for autumn the largest UHI ratio index is in 2016. The overall difference of UHI between the urban and suburban areas is significant, and the largest difference occurs in 2017. Seasonally, such difference in spring 2016 is the largest, but for summer and autumn the largest difference is found in 2017.Generally, the summer UHI difference between the urban and suburban areas is significantly higher than that in spring and autumn.
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