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《Chinese Journal of Atmospheric Sciences》 2006-01
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The Changes in Temperature and Its Possible Causes in Nanjing in Recent 44 Years

TANG Guo-Li~(1,2,3) and DING Yi-Hui~(1)1 Laboratory for Climate Studies,National Climate Center,China Meteorological Administration,Beijing 1000812 Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 1000293 Graduate University of Chinese Academy of Sciences,Beijing 100039  
Based on the meteorological data during 19572000,the change trends and characteristics of temperature and its possible causes in Nanjing in recent 44 years have been analyzed and studied.By means of the comparison of temperature changes among Nanjing,Chuxian and Liyang,the temperature change of the different cities and their contrasts have been also analyzed and discussed.The results show that the temperature has increased remarkably in Nanjing in recent 44 years,with the most obvious warming occurring in winter,and a cooling trend in summer.Nanjing's linear trend is basically similar to all China's trend in mean temperature,but there is also some difference. The trend in maximum temperature is consistent with that of the mean temperature in Nanjing.It should be noticed particularly that the maximum temperature in summer has a more striking decrease.The fact that the increase in minimum temperature is especially remarkable shows that the effect of climate warming on the minimum temperature is more obvious than others.The annual and seasonal daily range are obviously decreasing,which indicates that Nanjing's climate tend to get milder.The main reason of daily range decreases is that the extent of warming in the minimum temperature is larger than that of the maximum temperature.In summer,however,a larger extent of decrease in maximum temperature is its major cause.The hot and cold days are decreasing,and the dates of the beginning and ending of hot days are obviously earlier in recent 22 years.The possible causes of the temperature change in Nanjing is closely related to the change of climate background.Then the increase of air temperature there is a response to the global warming and China's climate change.On the one hand,under the global warming,variation of general circulation that can cause China's climate to change is probably a direct cause of the increase of air temperature in Nanjing.In fact,the mean circulation makes intensity of East Asian winter monsoon decline,thus the temperature in winter has an obvious increase.On the other hand,the temperature has a close relation with other weather conditions in summer.Under the influence of general circulation,the stronger north wind anomaly in the lower troposphere in North China leads to the increase of rainfall and cloud fraction,as well as the decrease of sunshine time and temperature along the middle to lower reaches of the Changjiang River in recent 10 or more years.Thus the temperature in summer is on the decrease.Besides,the temperature differences between Nanjing and Chuxian have largely decreased,and the differences between Nanjing and Liyang have not had obvious change.The relative extents of warming in the different types of cities have some difference from decade to decade.The differences are probably related to the different population growth and economic development speed.According to comparison of the differences of temperature change in the different types of cities, it is not certain that the warming rates in the bigger cities are larger than those in the smaller cities.Because of the complexities of air temperature change in different cities and related urbanization effects,the impacts of large, middle and small cities on temperature change should all be considered when the change in temperature and the effects of urbanization are studied.
【Fund】: 国家“十五”科技攻关项目课题“全球与中国气候变化的检测和预测”(2001BA611B-01);; 中国气象局气候变化研究基金
【CateGory Index】: P463
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