Polar boundary

极界───Polar boundary

polar vortex area on the Northern Hemisphere, in summer the polar vortex boundary withdraw about 30 latitudes than winter.───冬夏季北半球极涡面积的比较发现夏季和冬季相比极涡边界收缩了近30个纬度。

A new pseudo-spectral method based on polar coordinate system was presented to resolve the difficulty in the coordinate singularity and treatment of pressure boundary conditions.───谱方法在极坐标下遇到的坐标奇异以及压力边界条件难处理等问题，提出了一种新的基于极坐标系下的拟谱方法。

The rocket experimental data indicated that the layered dusty plasma structure has a sharp boundary in the summer polar mesopause.───火箭探空实验观测结果显示，极区夏季中层顶尘埃等离子体分层中存在着稳定的锐边界结构。

In the recent years, sunlit snow and ice has been proved to be an important NOX source in the polar boundary layer.───近年来，人们认识到冰雪在光照下释放NOx是极地大气边界层NOx的一个重要来源。