Climate change in Urumqi City during 1960–2013

The temporal distribution of platinum group elements (PGEs) in PM2.5

By means of the long-term data observed from three urban meteorological stations and three meteorological stations in Urumqi-Changji area,the impact of Urumqi and its surrounding city devoloping on the temperature and the evolutive trend of urban heat-island with the age were analyzed.The results showed that the urbanization factor has affected obviously in Urumqi-Changji areas since recent 33 years,the increase rate with decade of temperature in city are far larger than that in the rural area and the increase rates of mean temperature were 0.79 and 0.38℃·(10a)-1,respectively;the extremity of urban temperature tended in weaken,the the increase rate of temperature in recent 33 years was the mean minimum temperature in city to increase obviously,and the increase rates of urban and rural districts were 1.12 and 0.41℃·(10a)-1,respectively;the daily range of temperature in city obviously decrease,but in rural district increase slightly;the decreased trend of cold days in city was far larger than in rural district,the minimum temperature in heating season increased with the age is the most obviously in city,the mean minimum temperature in heating season in urban and rural districts are 1.46 and 0.57℃·(10a)-1,respectively.The increase rate of mean annual heat-island intensity is 0.71℃·(10a)-1,for season but talk to be 0.63,0.57,0.46 and 1.06℃·(10a)-1 in spring,summer,autumn and winter,respectively.The features of heat-island intensity displayed that nighttime is stronger and daytime is weaker;their intensities are 2.9,2.9,0.0 and 3.0℃ at 02:00,08:00,14:00 and 20:00,respectively,thereinto the increase rates of heat-island intensity are 1.17,1.13 and 0.70℃·(10a)-1 at 02:00,08:00 and 20:00 respectively;when the inversion conditions isn′t in winter,the high temperature area coincide with in prosperous area in city,the temperature in city centre is higher by 3～4℃ than the edge of city.

Chen Yi-zhen

Papers

Impact of the Urbanization on Temperature in Urumqi-Changji Areas and Its Heat-Island Effect Analysis