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CHANGES IN OCEANIC AND TERRESTRIAL CARBON UPTAKE SINCE 1982

机译:自1982年以来海洋和陆地碳吸收的变化

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CHANCES in the carbon isotope ratio (delta(13)C) of atmospheric CO2 can be used in global carbon-cycle models(1-5) to elucidate the relative roles of oceanic and terrestrial uptake of fossil-fuel CO2. Here we present measurements of delta(13)C made at several stations in the Northern and Southern hemispheres over the past decade. Focusing on the highest-quality data from Cape Grim (41 degrees S), which also provide the longest continuous record, we observe a gradual decrease in delta(13)C from 1982 to 1993, but with a pronounced flattening from 1988 to 1990. There is an inverse relationship between CO2 growth rate(6) and El Nino/Southern Oscillation (ENSO) events which is not reflected in the isotope record. Thus, for the ENSO events in 1982, 1986 and 1991-92, we deduce that net ocean uptake of CO2 increased, whereas during La Nina events, when equatorial sea surface temperatures are lower, upwelling of carbon-rich water increases the release of CO2 from the oceans. The flattening of the trend from 1988 to 1990 appears to involve the terrestrial carbon cycle, but we cannot yet ascribe firm causes. We find that the large and continuing decrease in CO2 growth starting in 1988(6) involves increases in both terrestrial and oceanic uptake, the latter persisting through 1992. [References: 20]
机译:大气CO2的碳同位素比(delta(13)C)的变化可用于全球碳循环模型(1-5),以阐明海洋和陆地吸收化石燃料CO2的相对作用。在这里,我们介绍过去十年中在北半球和南半球几个站点进行的δ(13)C的测量。着眼于开普格里姆角(41度)的最高质量数据,该数据也提供了最长的连续记录,我们观察到1982年至1993年间delta(13)C逐渐降低,但1988年至1990年间出现了明显的持平。二氧化碳记录的增长速度(6)与厄尔尼诺/南方涛动(ENSO)事件之间存在反比关系,这在同位素记录中并未反映出来。因此,对于1982年,1986年和1991-92年的ENSO事件,我们推论海洋净二氧化碳吸收量增加,而在拉尼娜事件期间,赤道海面温度较低,富含碳的水上升则增加了二氧化碳的释放。从海洋。 1988年至1990年趋势的平缓似乎涉及陆地碳循环,但我们尚不能确定原因。我们发现,从1988年开始,二氧化碳的大量持续减少(6)涉及陆地和海洋吸收的增加,后者一直持续到1992年。[参考文献:20]

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