发表机构
York University; Princeton University（约克大学; 普林斯顿大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究用简单模型拟合化石燃料排放与大气CO2浓度及δ13C观测，预测排放停止后浓度差和同位素乘积差分别以60年和8年时间常数指数衰减，差异源于陆地光合与呼吸驱动的同位素交换。
AI 中文摘要
一个简单模型使得化石燃料燃烧向大气排放的CO2观测值与大气CO2浓度C的观测增加以及同位素δ值δ13C的观测下降之间取得了良好的一致性。如果化石燃料排放停止，该模型预测：（1）CO2浓度C与工业化前值Co（=280 ppm）之差将呈指数衰减，时间常数为60年；（2）浓度-δ值乘积C×δ13C与工业化前值Co×δ13Co（=(280 ppm)×(-6.5‰)）之差将呈指数衰减，时间常数为8年。衰减时间不同是由于同位素交换，主要由陆地光合作用和呼吸作用驱动。
英文摘要
A simple model gives good agreement between observed emissions of CO2 into the atmosphere from the combustion of fossil fuels and observed increases of the atmospheric concentrations C of CO2 and decreases of the isotope delta value delta13C. If fossil fuel emissions were to cease the model predicts that: (1) the difference between the CO2 concentration C and the preindustrial value, Co = 280 ppm, would decay exponentially with time constant of 60 y; (2) the difference between the concentration-delta-value product C x delta13C and the preindustrial value Co x delta13Co = (280 ppm) x (-6.5%%), would decay exponentially with a time constant of 8 y. The decay times are different because of isotopic exchange, largely driven by photosynthesis and respiration on the land.
