乌鲁木齐机场2021年12月的一次降雪天气分析

A Snowfall Weather Analysis of Urumqi Airport in December 2021

摘要: 分析2021年12月9日乌鲁木齐机场降雪天气的环流形势、物理量场，说明了这次降雪天气的主要成因。结果表明：这次乌鲁木齐机场的降雪天气是北欧高压脊和极涡共同影响的结果，在北欧脊主导作用下，乌拉尔槽持续向东南方向移动，在中亚地区分为两段，一段北收东移并未影响新疆区域，另一端向东南移动并增强，移至新疆境内后，造成了乌鲁木齐机场地区的降雪天气。此次降雪过程中，从低层到中高层大气运动均为明显的上升运动。

Abstract: The circulation situation and physical quantity field of the snowfall weather at Urumqi Airport on December 9, 2021 are analyzed, and the main causes of the snowfall weather are explained. The results show that the snowfall at Urumqi Airport is the result of the joint influence of the Nordic ridge and the polar vortex. Under the leading role of the Nordic ridge, the Ural trough continues to move southeast. In Central Asia, it is divided into two sections. One section moves north to east without affecting Xinjiang, and the other end moves southeast and strengthens. After moving to Xinjiang, the snowfall in Urumqi Airport is caused. In addition, during the snowfall process, the at-mospheric motion from the lower level to the middle and upper levels is ascending.