气温日较差研究进展:变化趋势及其影响因素

Research Progresses on Diurnal Temperature Range: Variation Trend and Influential Factors

从日较差的变化趋势、影响因素以及人类活动对气候变化影响的指示3个方面对日较差的研究进行了总结和概括。观测数据以及气候模式模拟的结果表明,全球气温日较差在近半个多世纪以来呈下降趋势,而这种下降趋势不仅仅是自然变化的结果,还受到人类活动的影响。辐射、云量、气溶胶、下垫面的变化、水汽、降水以及航迹云等因素都能对日较差的变化造成影响。日较差的"周末效应"以及城市化过程中日较差的变化相对于平均气温的变化,能够更有效地指示人类活动对气候变化的影响。

Diurnal temperature range（DTR）,defined as daily maximum temperature minus the daily minimum,has significantly changed under the global warming.Both observation and simulation researches have shown a decreasing trend of global DTR since the 1950s,resulted from its natural variation and human activities.Solar radiation,cloud cover,aerosols,land cover change,water vapour,precipitation and contrails,etc.,can influence the DTR.Weekend effect of DTR is able to indicate anthropogenic impact on climate change,while the DTR variation caused by urbanization could be a better indicator of urbanization＇s effect on regional climate than the mean temperature variation.This study is a review of researches on DTR,including its variation,influential factors and indicator function of human activities impact on climate change.