Lifetimes and eigenstates in atmospheric chemistry
Lifetimes and eigenstates in atmospheric chemistry
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DOI：
10.1029/94gl00840
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发表时间：
1994-05
影响因子：
5.2
通讯作者：
M. Prather
中科院分区：
文献类型：
--
作者：
M. Prather
大气对化学扰动响应的时间尺度和模式由系统的特征值和特征向量定义。本文分析了一个简化的单盒CH_4-CO-OH体系的本征态。最长的时间常数（最小的特征值）总是超过由最长寿命气体CH 4的稳态损耗频率定义的寿命。因此，甲烷扰动的程度甲烷响应时间总是比预测的稳态寿命，是独立的线性极限的扰动的大小。大气恢复时间的延长可以通过我们离化学不稳定的对流层有多近来诊断，即，OH产生量超过氧化全球排放的CH 4、CO和其他碳氢化合物和物质所需的最低量。
The time scales and mode of the atmosphere's response to chemical perturbations are defined by the eigenvalues and eigenvectors of the system. The eigenstates of a simplified one-box CH4-CO-OH system are analyzed. The longest time constant (smallest eigenvalue) always exceeds the lifetime defined by the steady-state loss frequency for CH4, the longest lived gas. Thus, the extent of a CH4perturbation—the methane response time—is always longer than predicted by the steady-state lifetime and is independent of size of the perturbation in the linear limit. This lengthening of the atmospheric recovery time can be diagnosed by how close we are to a chemically unstable troposphere, i.e., how much OH production exceeds that minimum needed to oxidize just the global emissions of CH4, CO, and other hydrocarbons and species.