Tempo-spatial characteristics of sub-daily temperature trends in mainland China

摘要: The spatial and temporal pattern of sub-daily temperature change in mainland China was analysed for the period from 1973 to 2011 using a 3-hourly dataset based on 408 stations. increase surface air more significant by night between 1992, with fastest upward trend around local midnight being about 0.27 °C/decade, while it day 1992 2011, 0.46 °C/decade mid-late morning. season rapid also shifted winter 1973–1992 (the largest happened near December, 0.75 °C/decade) spring 1992–2011 at early afternoon March, 0.82 °C/decade). distributions trends shows that Northeast warmed significantly than elsewhere, but cooled 1992–2011, when Southwest new focus whereas had previously been cooling. A preliminary analysis possible causes implies changes solar radiation, cloud cover, aerosols observational environments stations might have contributed these observed changes.