人为活动对高平流层、中间层大气的影响

EFFECT OF ANTHROPOGENIC PERTURBATIONS ON THE UPPER STRATOSPHERE AND MESOSPHERE

利用一维光化、辐射耦合模式研究了人为活动所排放出的废弃物ＣＨ４、Ｎ２Ｏ和ＣＯ２含量增加对高平流层、中间层大气的影响．结果指出，对流层中这些气体增加一倍将导致上中层大气水汽、Ｏ３和温度的明显变化．ＣＯ２含量增加将使上中层温度降低约１０Ｋ；而ＣＨ４含量的加倍不仅使中层顶附近水汽含量增加５０％以上、也使其温度有更明显的下降，这将更有利于夜光云的形成．

In this paper, the effeCts of increased CH4, N2O and CO2 due to human activities on the upper stratosphere and mesosphere are investigated using a coupledchemical-radiative one-dimensional model. The results indicate that a doubling inthese gases leads to an obvious variation of water vapour and ozone concentrationsand temperature in the middle atmosphere. The temperature in the upper part ofmiddle atmosphere will decrease about 10K due to a doubling in troposphericCO2. And a doubling CH4 concentration in the troposphere not only lead to anincrease in water vapour concentration of more than 50% in the mesopause region, but also decrease its temperature obviously. It could be in favour of the formation of nocticlucent cloud.