Within-city spatial and temporal heterogeneity of air temperature and its relationship with land surface temperature
Within-city spatial and temporal heterogeneity of air temperature and its relationship with land surface temperature
复制标题
城市内气温时空异质性及其与地表温度的关系
DOI：
10.1016/j.landurbplan.2020.103979
复制
发表时间：
2021-02-01
影响因子：
9.1
通讯作者：
Wang, Weimin
中科院分区：
文献类型：
--
作者：
Cao, Jie;Zhou, Weiqi;Wang, Weimin
使用远程感知的数据得出的土地表面温度（LST），许多研究表明，不仅城市地区比周围的农村地区更温暖，而且在城市地区，温度的空间变化很大。但是，很少有研究研究了城市内空气温度的空间变化。使用2017年深圳117个气象站收集的空气温度数据，我们量化了空气温度的城市内部空间模式及其夜间和季节性变异性。我们进一步研究了空气温度与LST之间的定量关系，并比较了它们的时空模式。我们发现：1）空气温度在空间上有很大差异，显示出非常强大的空间异质性，并且具有较大的夜间和季节性变化； 2）在极高的热量日，空间和时间变化更为突出，在此期间，电台之间的每小时最高温度的差异可能在16:00左右达到8.7摄氏度，并保持高达8.6摄氏度，直到23:00，表明位置在较高温度的城市中，城市热量可能会遭受更大的密集和更长的城市热量，从而加剧了当地规模的空气温度差异。 3）LST与空气温度有显着正相关，尤其是在夏夜，但是它们的凉爽和热点并不总是在太空中重叠。结果可以增强对城市热环境的空间异质性的了解，并在越来越温暖的全球气候中对过度的城市热量和适应性产生实际影响。
Using land surface temperatures (LST) derived from remotely sensed data, numerous studies have shown that not only urban areas are warmer than surrounding rural areas, but within urban areas, there are large spatial variations in temperature. Few studies, however, have investigated the spatial variation of air temperature within a city. Using air temperature data collected from 117 weather stations in Shenzhen for the year of 2017, we quantified the within-city spatial pattern of air temperature and its nocturnal and seasonal variability. We further investigated the quantitative relationship between air temperature and LST and compared their spatiotemporal patterns. We found that: 1) Air temperature varied greatly in space, showing very strong spatial heterogeneity and having large nocturnal and seasonal variability; 2) The spatial and temporal variation is more prominent during extreme heat days, during which the difference of hourly maximum temperature among stations could reach 8.7 degrees C around 16:00 and remain as high as 8.6 degrees C until 23:00, indicating that locations in cities with higher temperatures may suffer more intensive and longer excessive urban heat, and thereby global warming may exacerbate the difference in air temperature at the local scale; 3) LST had significantly positive correlations with air temperature, especially in the summer night, but their cool and hot spots did not always overlap in space. Results can enhance understanding of the spatial heterogeneity of the urban thermal environment and have practical implications on excessive urban heat mitigation and adaptation in an increasingly warming global climate.