A 2-D model calculation of atmospheric lifetimes for N2O, CFC-11 and CFC-12
A 2-D model calculation of atmospheric lifetimes for N2O, CFC-11 and CFC-12
复制标题
N2O、CFC-11 和 CFC-12 大气寿命的二维模型计算
作者：
M. Ko;N. Sze
N2 O、CFC-1 - 3（CFC-11）和CF2 C12（CFC-12）的大气寿命的准确值对于研究其生命周期和预测其未来大气水平至关重要1 - 3。据了解，这些气体主要通过平流层的光解作用去除。由这些去除过程设定的寿命通常从一维（1-D）模型推断。使用一个二维（2-D）的纬向平均模型与最近的观测，我们认为，平流层的去除率也可能取决于某些纬度的功能，包括纬度变化的气体浓度，光解率及其相关性，功能，不能包括在1-D模型。我们的讨论还考虑了1-D模型结果的验证，特别是关于大气寿命的预测。
Accurate values for the atmospheric lifetimes of N2O, CFC13(CFC-11) and CF2C12(CFC-12) are vital1–3for studies of their life cycles and in attempts to forecast their future atmospheric levels. These gases are known to be removed mainly by stratospheric photolysis. The lifetimes set by these removal processes are usually inferred from one-dimensional (1-D) models. Using a two-dimensional (2-D) zonal-mean model together with recent observations, we argue here that the stratospheric removal rates may also depend on certain latitudinal features, including latitudinal variations of the gas concentrations, photolysis rates and their correlations, features that cannot be included in the 1-D models. Our discussion also considers the validation of 1-D model results, particularly regarding predictions of atmospheric lifetimes.