摘要
[ Objective] The research aimed to study variation of the urban heat island （UHI） intensity and its relationships with air pollutants in Kunming. [ Method] Observation data of the air temperature series from Kunming station and surrounding Taihuashan meteorological station were used to investigate the variation characteristics of UHI intensity in Kunming during 2001 -2010. Meanwhile, relationship between UHI intensity and air quality on the basis of concentration data for primary air pollutants （SO2, NO2 and PMlo ） from environmental monitoring station of Kunming was studied in this paper. [Result] Annual mean UHI intensity increased at the rate of 0.110 ℃/10 a, and UHI intensity was higher in dry season than that in rainy season. The change trend of air pollutants level in Kunming was in accordance with that of the UHI intensity. When UHI intensity reached peak value, air pollutants showed high concentration. UHI intensity had significantly positive correlation with air pollutants level. Annual mean UHI intensity had significantly positive correlation with PMlo level under the likelihood of 95%, but monthly mean UHI intensity had significantly positive correlation with NO2 level under the likelihood of 99%. In addition, annual statistics days with Grade I air quality obviously decreased with the strengthenment of UHI intensity. Therefore, air quality in Kunming City tumed more deteriorated with the enhancement of UHI intensity. [ Conclusion] The research findings provided a valid scientific basis for the mitigation of UHI and improvement of the atmospheric environment in Kunming.
[ Objective] The research aimed to study variation of the urban heat island （UHI） intensity and its relationships with air pollutants in Kunming. [ Method] Observation data of the air temperature series from Kunming station and surrounding Taihuashan meteorological station were used to investigate the variation characteristics of UHI intensity in Kunming during 2001 -2010. Meanwhile, relationship between UHI intensity and air quality on the basis of concentration data for primary air pollutants （SO2, NO2 and PMlo ） from environmental monitoring station of Kunming was studied in this paper. [Result] Annual mean UHI intensity increased at the rate of 0.110 ℃/10 a, and UHI intensity was higher in dry season than that in rainy season. The change trend of air pollutants level in Kunming was in accordance with that of the UHI intensity. When UHI intensity reached peak value, air pollutants showed high concentration. UHI intensity had significantly positive correlation with air pollutants level. Annual mean UHI intensity had significantly positive correlation with PMlo level under the likelihood of 95%, but monthly mean UHI intensity had significantly positive correlation with NO2 level under the likelihood of 99%. In addition, annual statistics days with Grade I air quality obviously decreased with the strengthenment of UHI intensity. Therefore, air quality in Kunming City tumed more deteriorated with the enhancement of UHI intensity. [ Conclusion] The research findings provided a valid scientific basis for the mitigation of UHI and improvement of the atmospheric environment in Kunming.
基金
Supported by Yunnan Provincial Natural Science Foundation(2011FB009)
Scientific Research Fund of Yunnan Provincial Education Department (2012Y485)
