合肥城市热岛变化特征研究

利用合肥历史气候资料分析城市热岛的年、季、日变化特征。结果表明:近36年中2003年城市热岛(ΔTu-r)日平均值最大,达到1.08℃;ΔTu-r季平均值冬季最大,为0.55℃,夏季最小,仅为0.30℃;年际变化1970~1990年间ΔTu-r较小,1991~2005年ΔTu-r平均为0.54℃,热岛效应明显增强;年代变化以90年代为最大,70年代最小。近36年年平均ΔTu-r明显上升,市区气温平均每10年升高0.20℃,郊区气温平均每10年升高0.15℃;合肥年平均气温明显存在以12年为周期的变化。

Study on the Character of Heat Island in Hefei City

In this paper the variation of mean temperature in Hefei city was analyzed.The results showed that the largest difference of mean daily in urban of heat island(ΔTu-r) appeared in 2003 during the last 36 years.ΔTu-r was utmost in winter season,0.55 ℃,while ΔTu-r was the least in summer,0.30 ℃.For the inter annual variability of temperature,ΔTu-r was little from 1970 to 1990,while ΔTu-r was great from 1991 to 2005,and the temperature in the city was 0.54 ℃ higher than that in the suburb so the heat island effect in urban was reinforced from 1991 to 2005.ΔTu-r was least in 1970's,whereas the difference was the maximum in 1990's.The mean annual ΔTu-r was increasing apparently during the last 36 years and it was increased by 0.20 ℃/10a in the city and 0.15 ℃/10a in its suburb,and the circle of mean annual temperature for 12 years was found in Hefei city.