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Change of Temperature using the Twentieth Century Reanalysis Data (20CR) on Antarctica
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  • Journal title : Ocean and Polar Research
  • Volume 34, Issue 1,  2012, pp.73-83
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2012.34.1.073
 Title & Authors
Change of Temperature using the Twentieth Century Reanalysis Data (20CR) on Antarctica
Zo, Il-Sung; Jee, Joon-Bum; Lee, Kyu-Tae; Chae, Na-My; Yoon, Young-Jun;
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 Abstract
Antarctica is very sensitive to climate change but the number of stations is not sufficient to accurately analyze climate change in this regoin. Model reanalysis data supplements the lack of observation and can be used as long term data to verify climate change. In this study, the 20CR (Twentieth Century Reanalysis) Project data from NCEP/NCAR and monthly mean data (temperature, solar radiation and longwave radiation) from 1871 to 2008, was used to analyze the temperature trend and change in radiation. The 20CR data was used to validate the observation data from Antarctica since 1950 and the correlation coefficients between these data were determined to be over 0.95 at all stations. The temperature increased by approximately /decade during the study period and over /decade over all of the months. This increasing trend was observed throughout the Antarctica and a slight increase was observed in the Antarctic Peninsula. In addition, solar radiation (surface) and longwave radiation (surface and top of atmosphere) trends correlated with the increase in temperature. As a result, outgoing longwave radiation at the surface is attenuated by atmospheric water vapor or clouds and radiation at the top of the atmosphere was reduced. In addition, the absorbed energy in the atmosphere increases the temperature of the atmosphere and surface, and then the heated surface emits more longwave radiation. Eventually these processes are repeated in a positive feedback loop, which results in a continuous rise in temperature.
 Keywords
climate change of antarctica;20CR NCEP/NCAR reanalysis data;temperature;solar radiation;longwave radiation;
 Language
Korean
 Cited by
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