大型火电厂热排放对邹县环境气温影响的初步研究

Effects of thermal discharge from big thermal power plant on environmental air temperature in Zouxian County of Shandong province

对1960—2009年邹城和兖州温度及温度日较差的年、季变化趋势进行分析,对比邹县电厂现况发展,研究电厂热排放对环境气温的影响程度和相对贡献。结果表明:近50 a来,邹城和兖州年平均气温呈上升趋势,年增温速率分别为0.326℃/10 a和0.124℃/10 a,且邹城显著增温时间与火电厂投产时间一致。1960—1994年,热排放增温率均为正值,最低气温高达0.51℃/10 a,日较差为-0.35℃/10 a,多个季和年值增温贡献为100%。1995—2005年,热排放增温率为正值,平均气温为0.209℃/10 a,最低气温为0.118℃/10 a,最高气温为0.056℃/10 a,日较差为-0.100℃/10 a,表现为热排放对平均气温和最低气温影响显著,对最高气温影响较弱,多个季增温贡献有所降低,仍显示出热排放对环境气温有相当程度的贡献。

Based on air temperature data at Zoucheng and Yanzhou stations from 1960 to 2009,annual and seasonal variations of air temperature and its diurnal range were analyzed.According to the development of the thermal power plant in Zouxian County,the effects of thermal discharge from the thermal power plant on the environmental air temperature were discussed.The results indicate that the mean annual air temperature at Zoucheng and Yanzhou increases with 0.326 ℃/10 a and 0.124 ℃/10 a in the recent 50 years,respectively.The time of remarkable warming at Zoucheng is in accord with that putting into production of thermal power plant.During 1960 to 1994,the warming rates caused by thermal discharge are positive,and those of the minimum annual air temperature and the diurnal range are 0.51 ℃/10 a and-0.35 ℃/10 a,respectively.The contributions of many seasonal and annual air temperatures to warming reach 100%.During 1995 to 2005,the warming rates of air temperature caused by thermal discharge are also positive.The warming rates of mean annual air temperature are 0.209 ℃/10 a,and those of the minimum and maximum mean annual air temperature are 0.118 ℃/10 a and 0.056 ℃/10 a,respectively.The warming rates of diurnal range of annual air temperature are-0.100 ℃/10 a.The effects of thermal discharge on mean air temperature and the minimum air temperature are significant,but not significant on the maximum air temperature.Although the contributions of many seasonal air temperatures to warming reduce,the effects of thermal discharge on the environmental air temperature are still significant.