Analysis on the Change of Urban Heat Island Effect in East China
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Keqi Zhao, Xiaoxiao Zhang
Using the data of temperature and precipitation in Xining, Datong and Huangzhong stations from 1986 to 2015, By linear regression, distance analysis and Mann-Kendall test, the effect of summer urban heat island effect on summer precipitation in Xining area was analyzed. Studies have shown that From 1986 to 2015, the intensity of urban heat island decreased in Xining city, the highest temperature contributes most to it. In the past 30 years, the summer temperature in Xining area has been rising significantly, The warming rates of mean temperature in Xining city, Datong and Huangzhong reached 0.7,1.0℃/10 a and 0.5℃/10, respectively The summer temperature in Xining city changed in 1997. Huangzhong had a mutation in 1994, Chase did not mutate. The summer precipitation and precipitation days in Xining urban area increased by 4.5 mm/10a and 1.2 d/10a respectively in recent 30 years. Chase's summer precipitation is increasing, The number of precipitation days is decreasing; The summer precipitation and precipitation days in Huangzhong are decreasing. The summer precipitation mutation in three stations mainly occurred in the 1990s, The city of Xining also mutated in 2000. There is a good correlation between the intensity and maximum temperature of summer maximum temperature and summer precipitation and precipitation days in urban area. Suburbs are also the best correlation between summer maximum temperatures and precipitation. The effect of urban heat island effect on precipitation is mainly due to the effect of prevailing wind direction and valley topography.
Urban Heat Island Effect, Summer Temperature, Precipitation