Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO2
Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO2
复制标题
DOI：
10.1126/science.1137004
复制
发表时间：
2007-06-22
期刊：
影响因子：
56.9
通讯作者：
Denning, A. Scott
中科院分区：
文献类型：
--
作者：
Stephens, Britton B.;Gurney, Kevin R.;Denning, A. Scott
中午垂直大气CO2分布的测量揭示了年平均垂直CO2梯度与大气模型不一致，该模型估计从热带到北方纬度的陆地碳大量转移。最接近地再现观测到的年平均垂直CO2梯度的三个模型估计，北方每年（Pg C年（-1））的碳吸收较弱，热带排放较弱，为+0.1 Pg C年（-1），而以前的共识估计分别为-2.4和+1.8 Pg C年（-1）。这表明，北方陆地吸收工业CO2排放的作用比以前认为的要小，在减去土地使用排放后，热带生态系统目前可能是CO2的强吸收汇。
Measurements of midday vertical atmospheric CO2 distributions reveal annual-mean vertical CO2 gradients that are inconsistent with atmospheric models that estimate a large transfer of terrestrial carbon from tropical to northern latitudes. The three models that most closely reproduce the observed annual-mean vertical CO2 gradients estimate weaker northern uptake of -1.5 petagrams of carbon per year (Pg C year(-1)) and weaker tropical emission of +0.1 Pg C year(-1) compared with previous consensus estimates of -2.4 and +1.8 Pg C year(-1), respectively. This suggests that northern terrestrial uptake of industrial CO2 emissions plays a smaller role than previously thought and that, after subtracting land-use emissions, tropical ecosystems may currently be strong sinks for CO2.