Studies of the morphology and the hetelogeneous reactions of Arctic PSC over Spitsbergen

在Ny-Aalesund和Svalbard的激光雷达观测中观察了许多PSC活动。在PSC的垂直剖面中发现了sandwich结构，其中，当平流层温度接近冰点时，通常被观察到低点，具有很大的特征; PSC被观察到平流层温度退化时，在冰冻点附近观察到。PSC的后散射比率的峰值值为5至8，而分化比率接近零。The peaks of depolarization were found at the top and bottom sides of the PSC scManagement ing layer。用另一个词来说，一个液体层介于固体层之间（三明治）。在depolarization peaks. scManagement ing and depolarization are inversely correlated in the sandwich structure for the vertical direction。这种反向关联并不只是在三明治结构中观察到，但也发生在几乎所有的PSC事件中。当散射和沉积完全相同时，有几个事件发生。激光观测的数值模拟显示了对PSC微物理过程的一些重要建议。通过H2SO 4/HNO 3/H2O的长期解决方案，PSC的部分可以解释。The observations were well simulated only when the number concentration of solid particles are between 10-D1-3-D1和10-D1-2-D1 /cc。

Many PSC events were observed by the lidar observations at Ny-Aalesund, Svalbard (79゜N, 12゜W). The sandwich structure found in the vertical profile of PSC, which was frequently observed when the stratospheric temperature was lowered near the frost point, is very characteristic.The enhancement of PSC was observed when stratospheric temperature decreased near the frost point. The peak value of the backscattering ratio of the PSC is 5 to 8, and the depolarization ratio is near zero. The peaks of depolarization were found at the top and bottom sides of the PSC scattering layer. In other words, a liquid layer of PSC was between the solid layer (sandwich). The backscattering did not enhance at the depolarization peaks.The scattering and depolarization are inversely correlated in the sandwich structure for the vertical direction. This inverse correlation was observed not only in the sandwich structure, but also in the almost all the PSC events. There was few events when the scattering and depolarization were increased simultaneously.The numerical simulations of the lidar observations show some important suggestions for the microphysical processes of PSC. The simulations indicate that the parts of the characteristics of PSC can be explained by the ternary solution of H2SO4/HNO3/H2O. The observations were well simulated only when the number concentration of solid particles are between 10ィイD1-3ィエD1 and 10ィイD1-2ィエD1 /cc.