NO_x的准两年周期变化及其与臭氧准两年周期振荡的关系 II.模拟研究

利用NCAR的包含化学、辐射、动力相互作用的二维模式就纬向风的准两年周期振荡 (简称QBO)对平流层微量元素分布的影响进行数值模拟试验。模拟中 ,输入纬向风QBO的值 ,计算出NOx、臭氧浓度和各种气象要素的垂直经向分布 ,并与不考虑QBO强迫的数值模拟结果进行对比。在第I部分HALOE资料分析的基础上 ,进一步讨论了在纬向风QBO的影响下NOx浓度垂直分布的变化及其准两年周期振荡 ,并研究了NOx的QBO与臭氧QBO的关系。结果表明 :模拟六年平均的NOx混合比分布与观测结果基本一致 ,并且在纬向风场QBO强迫下 ,NOx混合比扰动有明显的准两年周期振荡 ;与臭氧的QBO比较 ,发现在2 8km以下 ,NOx的QBO与臭氧QBO同位相 ,而在 2 8km以上 ,它们则是反位相 ,与HALOE资料的观测结果基本吻合。文中对模拟得到的由于风场QBO引起的余差环流输送作用做了进一步的分析 ,并讨论了在不同高度的气层中余差环流的输送作用与NOx破坏作用在臭氧QBO形成中的相对重要性

Quasi-Biennial Oscillation in NO_x and Relationship to O_3 QBO Part II.Numerical Experiment

The NCAR interactive chemical, dynamical and radiative two\|dimensional model is used to study the impact of the quasi\|biennial oscillation (QBO) in zonal wind on the distribution of the stratospheric tracer gases In the model, the zonal wind QBO is input to calculate the vertical meridional distribution of NO x ,O 3 and the meteorological elements, and compared with the results simulated without wind QBO forcing Based on the HALOE data analysis of the part I of our paper, we explored the variation of the NO x vertical distribution and NO x QBO under the impact of wind QBO further more, which is then compared with O 3 QBO The results indicate that the simulated distributions of six\|year averaged NO x mixing ratio are almost consistent with the distributions of the observational NO x , and the QBO in the turbulence of NO x mixing ratio is obvious under the zonal wind QBO forcing; NO x QBO is in phase with O 3 QBO above the 28km altitude and out of phase under the altitude, which is consistent with the results of the HALOE observation Deeper analysis on the simulated residual circulation induced by zonal wind QBO is done to discuss the relative essentiality of transport of residual circulation and destruction induced by NO x in the formation of O 3 QBO in different altitude layer