Uncertainty of temperature variability in the Arctic of the 20th century

As one cold source of the earth,the Arctic plays an important role in its climate system.The study analyzes and summarizes temperatures from meteorological station and modeling,and temperature records of the past two thousand years in the Arctic.The results show：1）The near-surface air temperature anomalies of Greenland Inland ice show a larger change amplitude than Northern Hemisphere,and two warm periods,including 1923—1965 and 1994—present in the 20th century,can be identified,among which the former is warmer;2）The temperature in the Arctic was going up in the 20th century,with its average temperature of summer and annual showing a consistent variability and no significant anomaly signals of the temperature could be found between them;3）The quantitative reconstructions of paleo-temperature in the Arctic showed a warming trend in the 20th century,but there was amplitude discrepancy in the variability of temperature.A number of records failed to reveal a warming phase from 1994 to the present,reflecting high complexity between the paleoclimate proxy and climate system.All these facts reveal the uncertainties in the trend of future climate change in the Arctic.In the context of global climate change,the importance of related research in the Arctic is increasing.However,much more work must be done for getting definite conclusions.6 page(s