为探讨成都市2007~2022近15年来热岛效应特征和时空演变规律,基于四年(2007、2012、2017、2022年)的MODIS遥感影像反演了成都市地表温度,结果表明:1) 成都市地表温度总体呈现上升趋势,呈现以中心城区为热中心,向城区周围扩散的分布特征...为探讨成都市2007~2022近15年来热岛效应特征和时空演变规律,基于四年(2007、2012、2017、2022年)的MODIS遥感影像反演了成都市地表温度,结果表明:1) 成都市地表温度总体呈现上升趋势,呈现以中心城区为热中心,向城区周围扩散的分布特征,昼夜季节变化显著。年均地表温度低于10℃的地区基本位于西北地区,而日间年均地表温度28℃以上的地区主要位于中部地区;2) 从季节上看,热岛效应呈现夏强冬弱的特征,其中夏季城区和郊区平均温度差值可达6℃。春季、夏季夜间和秋季夜间热岛强度有增强趋势;3) 成都市城区内热岛状况有所改善,但周围受热岛效应影响范围扩大,热岛面积扩张;4) 成都市日间地表温度在城区的四周区域显著下降;西部山区地表温度变化与山地城市分布有关;成都东部以龙泉山脉为界温度变化多为带状分布。夜间地表温度变化多呈未显著变化。To investigate the characteristics and spatiotemporal evolution of the urban heat island effect in Chengdu over the past 15 years (2007~2022), MODIS remote sensing images from four years (2007, 2012, 2017, and 2022) were used to retrieve the land surface temperature of Chengdu. The results indicate that: 1) The land surface temperature in Chengdu has generally shown an upward trend, with a distribution pattern characterized by a heat center in the central urban area spreading towards the surrounding urban areas. There are significant diurnal and seasonal variations. Regions with an annual average land surface temperature below 10˚C are mainly located in the northwest, while areas with a daytime annual average land surface temperature above 28˚C are primarily located in the central region;2) Seasonally, the heat island effect is stronger in summer and weaker in winter, with the temperature difference between urban and suburban areas reaching up to 6˚C in summer. The intensity of the heat island effect at night during spring, summer, and autumn shows a trend of increasing;3) The heat island situation within the urban area of Chengdu has improved, but the area affected by the heat island effect around the city has expanded, with the heat island area increasing;4) During the daytime in Chengdu, surface temperatures significantly decrease in the surrounding areas of the urban district. In the western mountainous regions, surface temperature changes are associated with the distribution of mountainous cities. To the east of Chengdu, temperature variations along the Longquan Mountains are typically distributed in bands. Nighttime surface temperature changes generally show no significant variation.展开更多
由于城市化进程快速推进,城市环境问题日益凸显,热岛效应和臭氧问题是城市化两个突出的环境问题。为了研究川南城市群热岛效应对臭氧浓度的影响,本文用MODIS地表温度数据以及臭氧历史监测数据,分析了2010~2019年川南城市群城市热岛效应...由于城市化进程快速推进,城市环境问题日益凸显,热岛效应和臭氧问题是城市化两个突出的环境问题。为了研究川南城市群热岛效应对臭氧浓度的影响,本文用MODIS地表温度数据以及臭氧历史监测数据,分析了2010~2019年川南城市群城市热岛效应和臭氧浓度的时空分布特征、热岛效应对臭氧浓度的影响。结果表明:(1) 川南城市群城市用地热岛强度的年变化波动幅度较大,总体表现为2015年前减弱,2015年后增强,其中热岛强度最高值出现在2012年(1.39℃),最低值出现在2015年(−0.23℃)。热岛强度季节变化幅度较大。从空间分布上看,川南城市群秋季强热岛分布面积最广,冬季热岛分布显著缩减;(2) 川南城市群五个城市臭氧浓度均呈现春夏高,秋冬低的分布特征,五个城市除乐山外其余四个城市夏季臭氧浓度约为冬季的两倍。空间分布上,春季和冬季臭氧浓度空间分布表现为内江和自贡略高于剩余三个城市,夏季乐山和内江出现大面积高值区(88~102 μg/m3);(3) 热岛强度与臭氧浓度存在显著正相关性。城市化发展程度越高,对土地覆盖的影响越大,人口密度越集中,热岛效应越明显,促进臭氧的生成。Due to the rapid progress of urbanization, urban environmental problems are becoming increasingly prominent, with heat island effect and ozone problem being the two prominent environmental problems of urbanization. In order to study the impact of urban heat island effect on ozone concentration in the southern Sichuan urban agglomeration, this paper uses MODIS surface temperature data and historical ozone monitoring data to analyze the spatiotemporal distribution characteristics of urban heat island effect and ozone concentration in the southern Sichuan urban agglomeration from 2010 to 2019, as well as the impact of heat island effect on ozone concentration. The results show that: (1) the annual fluctuation of urban land heat island intensity in the southern Sichuan urban agglomeration is significant, with an overall trend of weakening before 2015 and increasing after 2015;The highest value of heat island intensity occurred in 2012 (1.39˚C), and the lowest value occurred in 2015 (−0.23˚C). The seasonal variation in heat island intensity is significant. From a spatial distribution perspective, the autumn heat island distribution area in the southern Sichuan urban agglomeration is the widest, while the winter heat island distribution is significantly reduced;(2) The ozone concentration in the five cities of the southern Sichuan urban agglomeration shows a distribution pattern of high in spring and summer, and low in autumn and winter. Except for Leshan, the ozone concentration in the other four cities in summer is about twice that in winter. In terms of spatial distribution, the spatial distribution of ozone concentration in spring and winter shows that Neijiang and Zigong are slightly higher than the remaining three cities, while in summer, Leshan and Neijiang have a large area of high-value areas (88~102 μg/m3);(3) There is a significant positive correlation between heat island intensity and ozone concentration. The higher the level of urbanization development, the greater the impact on land cover, the more concentrated the population density, the more obvious the heat island effect, and the promotion of ozone generation.展开更多
文摘为探讨成都市2007~2022近15年来热岛效应特征和时空演变规律,基于四年(2007、2012、2017、2022年)的MODIS遥感影像反演了成都市地表温度,结果表明:1) 成都市地表温度总体呈现上升趋势,呈现以中心城区为热中心,向城区周围扩散的分布特征,昼夜季节变化显著。年均地表温度低于10℃的地区基本位于西北地区,而日间年均地表温度28℃以上的地区主要位于中部地区;2) 从季节上看,热岛效应呈现夏强冬弱的特征,其中夏季城区和郊区平均温度差值可达6℃。春季、夏季夜间和秋季夜间热岛强度有增强趋势;3) 成都市城区内热岛状况有所改善,但周围受热岛效应影响范围扩大,热岛面积扩张;4) 成都市日间地表温度在城区的四周区域显著下降;西部山区地表温度变化与山地城市分布有关;成都东部以龙泉山脉为界温度变化多为带状分布。夜间地表温度变化多呈未显著变化。To investigate the characteristics and spatiotemporal evolution of the urban heat island effect in Chengdu over the past 15 years (2007~2022), MODIS remote sensing images from four years (2007, 2012, 2017, and 2022) were used to retrieve the land surface temperature of Chengdu. The results indicate that: 1) The land surface temperature in Chengdu has generally shown an upward trend, with a distribution pattern characterized by a heat center in the central urban area spreading towards the surrounding urban areas. There are significant diurnal and seasonal variations. Regions with an annual average land surface temperature below 10˚C are mainly located in the northwest, while areas with a daytime annual average land surface temperature above 28˚C are primarily located in the central region;2) Seasonally, the heat island effect is stronger in summer and weaker in winter, with the temperature difference between urban and suburban areas reaching up to 6˚C in summer. The intensity of the heat island effect at night during spring, summer, and autumn shows a trend of increasing;3) The heat island situation within the urban area of Chengdu has improved, but the area affected by the heat island effect around the city has expanded, with the heat island area increasing;4) During the daytime in Chengdu, surface temperatures significantly decrease in the surrounding areas of the urban district. In the western mountainous regions, surface temperature changes are associated with the distribution of mountainous cities. To the east of Chengdu, temperature variations along the Longquan Mountains are typically distributed in bands. Nighttime surface temperature changes generally show no significant variation.
文摘由于城市化进程快速推进,城市环境问题日益凸显,热岛效应和臭氧问题是城市化两个突出的环境问题。为了研究川南城市群热岛效应对臭氧浓度的影响,本文用MODIS地表温度数据以及臭氧历史监测数据,分析了2010~2019年川南城市群城市热岛效应和臭氧浓度的时空分布特征、热岛效应对臭氧浓度的影响。结果表明:(1) 川南城市群城市用地热岛强度的年变化波动幅度较大,总体表现为2015年前减弱,2015年后增强,其中热岛强度最高值出现在2012年(1.39℃),最低值出现在2015年(−0.23℃)。热岛强度季节变化幅度较大。从空间分布上看,川南城市群秋季强热岛分布面积最广,冬季热岛分布显著缩减;(2) 川南城市群五个城市臭氧浓度均呈现春夏高,秋冬低的分布特征,五个城市除乐山外其余四个城市夏季臭氧浓度约为冬季的两倍。空间分布上,春季和冬季臭氧浓度空间分布表现为内江和自贡略高于剩余三个城市,夏季乐山和内江出现大面积高值区(88~102 μg/m3);(3) 热岛强度与臭氧浓度存在显著正相关性。城市化发展程度越高,对土地覆盖的影响越大,人口密度越集中,热岛效应越明显,促进臭氧的生成。Due to the rapid progress of urbanization, urban environmental problems are becoming increasingly prominent, with heat island effect and ozone problem being the two prominent environmental problems of urbanization. In order to study the impact of urban heat island effect on ozone concentration in the southern Sichuan urban agglomeration, this paper uses MODIS surface temperature data and historical ozone monitoring data to analyze the spatiotemporal distribution characteristics of urban heat island effect and ozone concentration in the southern Sichuan urban agglomeration from 2010 to 2019, as well as the impact of heat island effect on ozone concentration. The results show that: (1) the annual fluctuation of urban land heat island intensity in the southern Sichuan urban agglomeration is significant, with an overall trend of weakening before 2015 and increasing after 2015;The highest value of heat island intensity occurred in 2012 (1.39˚C), and the lowest value occurred in 2015 (−0.23˚C). The seasonal variation in heat island intensity is significant. From a spatial distribution perspective, the autumn heat island distribution area in the southern Sichuan urban agglomeration is the widest, while the winter heat island distribution is significantly reduced;(2) The ozone concentration in the five cities of the southern Sichuan urban agglomeration shows a distribution pattern of high in spring and summer, and low in autumn and winter. Except for Leshan, the ozone concentration in the other four cities in summer is about twice that in winter. In terms of spatial distribution, the spatial distribution of ozone concentration in spring and winter shows that Neijiang and Zigong are slightly higher than the remaining three cities, while in summer, Leshan and Neijiang have a large area of high-value areas (88~102 μg/m3);(3) There is a significant positive correlation between heat island intensity and ozone concentration. The higher the level of urbanization development, the greater the impact on land cover, the more concentrated the population density, the more obvious the heat island effect, and the promotion of ozone generation.
