Climate Change Research ›› 2011, Vol. 7 ›› Issue (3): 171-177.

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ENSO, Volcanic Activities and Interannual Variations of Atmospheric CO2


  • Received:2010-04-28 Revised:2011-03-17 Online:2011-05-30 Published:2011-05-31
  • Contact: Zhong-Xiao CHEN

Abstract: Based on the observations of atmospheric CO2 and its δ13C, the characters of seasonal and interannual variations of atmospheric CO2 were analyzed in different regions. The trends of atmospheric δ13C were used to distinguish whether the dominative influential factor for the variations of atmospheric CO2 is from the terrestrial or the ocean. The results show that the interannual variations of atmospheric CO2 are mainly influenced by ENSO-related change of terrestrial vegetation primary production, not by oceanic sink. And the intensity of La Nina has more effect on atmospheric CO2 than that of El Nino. The atmospheric CO2 increase would decrease after volcano events, which even conceal ENSO effects. The synchronized decrease in atmospheric δ13C increase after volcano eruptions indicates that it is likely due to the increase of oceanic uptake or the weakening of terrestrial respiration resulted from persistent decrease of surface temperature.

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