A simple forcing-feedback model of the effect of CO_(2) on temperatures implies that the natural logarithm of the concentration of CO_(2) in the atmosphere,lnC,and satellite-measured lower tropospheric temperatures,T,...A simple forcing-feedback model of the effect of CO_(2) on temperatures implies that the natural logarithm of the concentration of CO_(2) in the atmosphere,lnC,and satellite-measured lower tropospheric temperatures,T,should have the same order of integration.Multiple tests provide strong evidence that lnC has a unit root(it is integrated of order 1).However,the hypothesis that T has a unit root is strongly rejected both for the globe as a whole and for a set of non-overlapping geographic subsets.A possible explanation is that CO_(2) accumulation is associated with some other trending process that moderates its effects on atmospheric temperatures in such a way as to prevent T from also having a unit root.The analysis also reveals interactions between temperature anomalies in the non-overlapping geographic subsets that further limit the range of models consistent with the evidence.展开更多
文摘A simple forcing-feedback model of the effect of CO_(2) on temperatures implies that the natural logarithm of the concentration of CO_(2) in the atmosphere,lnC,and satellite-measured lower tropospheric temperatures,T,should have the same order of integration.Multiple tests provide strong evidence that lnC has a unit root(it is integrated of order 1).However,the hypothesis that T has a unit root is strongly rejected both for the globe as a whole and for a set of non-overlapping geographic subsets.A possible explanation is that CO_(2) accumulation is associated with some other trending process that moderates its effects on atmospheric temperatures in such a way as to prevent T from also having a unit root.The analysis also reveals interactions between temperature anomalies in the non-overlapping geographic subsets that further limit the range of models consistent with the evidence.
