廊坊地区中间层顶钠原子垂直动力学输送特征观测分析

Observation analysis on the characteristics of vertical dynamical transport of sodium atoms in the mesopause region over the Langfang area

利用中科院国家空间科学中心廊坊观测站(40.0°N,116.3°E)钠荧光多普勒激光雷达观测数据对钠原子的重力波输送和湍流输送进行分析,利用流星雷达观测数据对钠原子的环流输送进行分析,结果显示重力波动力学输送、重力波化学输送、湍流混合输送及环流输送对钠原子输送贡献的量级相当.其中重力波动力学输送在85~100km整体为负向,在90~95km占主要地位的平均输送速度为-3.1cm·s^(-1);重力波化学输送在85~94km为正向,94~100km基本为负向,在85~90km占主要地位的平均输送速度为3.3cm·s^(-1);湍流混合输送在85~95km为负向,95~100km为正向,在85~90km占主要地位的平均输送速度为-4.9cm·s^(-1);85~100km环流输送整体为正向,平均输送速度为1cm·s^(-1).88~95km四种动力学输送产生的平均合速度为-1cm·s^(-1),负向的垂直输送特征对钠原子"源""汇"平衡十分重要.本文结果可为不同大气圈层之间重力波产生的能量物质交换机制研究和圈层之间的耦合过程研究提供观测事实参考,为大气化学成分的垂直输送机制建模提供参数化依据.

Profiles of sodium atoms density, vertical wind and temperature data derived from a sodium fluorescence Doppler Lidar of National Space Science Center at Langfang station （40.0°N, 116.3°E） were used to study the gravity wave-induced dynamical transport, chemical transport and turbulence mixing transport of Na atoms. Meridional wind data derived from a Meteor radar were employed to characterize the advection transport in the mesopause region. The results show that four dynamical transport mechanisms of sodium atoms are roughly comparable between 85 and 100 km, wave-induced dynamical transport is overall downward and the dominated mean velocity is -3. 1 cm . s-1 between 90 and 95 km. Wave-induced chemical transport is upward below 94 km and the dominated mean velocity is 3.3 cm . s-1 between 85 and 90 km. Turbulence mixing transport is downward from 85 to 95 km and upward from 95 to 100 km, the dominant mean velocity is -4.9 cm . s-1 between 85 and 90 km. Advective transport is overall upward, the mean velocity is 1 cm . s- 1 between 85 and 100 km. These four dynamical transport mechanisms produce a combined velocity of --1 cm . s-1 between 88 and 95 km, and downward dynamical transport mechanisms play a very important role in the balance of sodium layer. These results could provide observation references to the research on exchange mechanism of energy and atmospheric composition induced by gravity waves and the coupling process between different atmospheric layers, and guidance to parameterization of the atmospheric metal model.