Clement C F, Ford I J, Twohy C H
Department of Physics nd Astronomy, University College London, UK.
Phys Rev Lett. 2000 Apr 24;84(17):4010-3. doi: 10.1103/PhysRevLett.84.4010.
Atmospheric gas concentrations were measured at 1 s intervals in the upper troposphere during a flight through and near the anvil of a storm. The observed very high correlations between the concentrations of CO and CH4 are interpreted as arising from the mixing of two distinct air masses with differing concentrations of each species, and is due to the nearly identical diffusivities of CO and CH4 in air. We find that the correlations depend on the period over which each concentration measurement was made. Correlations in measurements made over short periods decay with time, while correlations over larger scales remain high. We interpret this using a simple mixing model.
在一次穿越风暴砧顶及其附近区域的飞行过程中，对流层上层的大气气体浓度以1秒的间隔进行了测量。观测到的一氧化碳（CO）和甲烷（CH4）浓度之间非常高的相关性被解释为是由于两种不同气团的混合，每种气体在这两种气团中的浓度不同，并且这是由于CO和CH4在空气中的扩散率几乎相同。我们发现，这种相关性取决于每次浓度测量所持续的时间段。短时间内进行的测量中的相关性会随时间衰减，而更大尺度上的相关性则保持较高。我们使用一个简单的混合模型来对此进行解释。
