Urban heat island is the most typical manifestation of the impact of urbanization on the urban climate. The main reason for this phenomenon is that the economic and social development of human beings has changed the nature of the underlying surface. The urban heat island (UHI) would affect the urban pollution diffusion because of the changes of urban thermal environment and urban wind field caused by UHI circulation. The effects of urban environment on the pollution diffusion mainly include both thermal and dynamic processes. In this paper, urban air quality mode of Nanjing University (NJUCAQPS) was used to study the influence of urban heat island on the pollution diffusion in Suzhou by two group sensitive tests which separate out the urban thermal and dynamic effects. The results show that the urban heat island increase the atmosphere instability and arise the urban heat island circulation, which convergence to the urban area and increase the vertical velocity in the urban. The net effect of urban heat island is increase the diffusion capability of pollution. The urban heat island would decrease the pollution concentration near the surface, for example, with a reduction of 5×10-9 kg·m-3 of PM10 and PM2.5 in urban area, and with a decreasing tendency of urban aerosol species and AQI at different level. On the contrary, the urban heat island would increase the visibility near surface with the extreme value of 0.5 km. Above 180 meters height, PM10 and PM2.5 and the main aerosol species are increased by the effect of urban heat island. At 400 m altitude, the increase of PM10 and PM2.5 can reach the values of 11 and 9×10-9 kg·m-3 respectively. Dynamic effects of urban architectures significantly decrease the wind velocity atmospheric diffusion capacity in urban area, while the heat island effects (thermal effects) are opposite to the dynamic effects of architectures, but effects of heat island on pollution diffusion are less than the effects of dynamic effects of urban.
ZHU Yan
,
LIU Hongnian
,
SHEN Jian
,
JI Yan
. Influence of Urban Heat Island on Pollution Diffusion in Suzhou[J]. Plateau Meteorology, 2016
, 35(6)
: 1584
-1594
.
DOI: 10.7522/j.issn.1000-0534.2015.00084
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