国产综合在线观看视频,国产精品原创视频,亚洲国产熟亚洲女视频,一级风流片a级国产

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.