SIMULATION STUDY OF CENTENNIAL SCALE SURFACE TEMPERATURE SYNCHRONICITY CHANGES BETWEEN EAST ASIA AND THE WHOLE WORLD IN THE LAST MILLENNIUM
Changes in surface temperature have a huge impact on the Earth's natural environment and biological systems.Understanding regional temperature variation has become the key to global climate change research.However,there is still a great deal of uncertainty about whether regional surface temperature evolution is consistent with global evolution.The study of the synchronization between East Asia(4°～53°N,105°～140° E)and global centennial scale surface temperature changes in the last millennium can supplement the study of regional surface temperature responses to global changes.In this study,the synchronization and amplitude differences of East Asian and global surface temperature changes in different centuries were studied using the transient simulation experiment(CESM-LME)over the last millennium(850～2005 A.D.).The reasons for the difference between East Asian and global land surface temperature synchronous changes in several centuries are analyzed.This paper draws the following main conclusions.Before the 20th century,East Asia and the world experienced the Medieval Warm Period(MWP)and the Little Ice Age(LIA)for thousands of years.On the centennial scale,the surface temperature fluctuation is generally consistent.In the 10th,11th,13th,18th and 19th centuries,surface temperature fluctuations in East Asia were highly synchronized with those on a global scale,with the smallest differences.In the 12th and 14th to 17th centuries,there was a marked difference in their changes.In the 12th century,the East Asian surface temperature anomaly was 0.047 ℃ lower than the global average.During the 14th to 17th centuries,East Asian temperature anomalies were 0.036 ℃,0.040 ℃,0.032 ℃ and 0.071 ℃ higher than the global average,respectively.The range of temperature change in East Asia is generally smaller than that of the whole world,and natural external forces such as solar radiation,volcanic activity and internal variability play a leading role in the formation of differences.Since the 20th century,however,the two changes have shown a greater divergence,with the East Asian temperature anomaly 0.179 ℃ lower than the global average.In East Asia,land surface temperature has not increased as much as global temperature,or even cooled.Artificial extrinsic forcing has played a dominant role in this period.The effect of greenhouse gas concentration change on polar temperature has a significant amplification effect,which is the main reason for the difference between East Asia and the global temperature change.The cooling caused by anthropogenic aerosol emissions in East Asia is also one of the reasons why East Asia is out of synchronization with global temperature changes.
surface temperature changelast millenniumsimulation studyglobalEast Asiasynchronization
万方数据
维普
