酒泉地区大气风场分布特征的研究分析

Research and Analysis on the Distribution Characteristics of Atmospheric Wind Fields

本文分析了2012-2021年酒泉地区大气风场垂直分布,日、月、季节及年际变化特征。根据风场特征分为新的3层结构:第1层高度是在4km以下,风速较小,基本都在2.5m/s左右,但不同季节的风向差别较大;第2层是高度在4-20km之间的大气风场,风速先随高度增加而递增后风速随高度的增加而递减,270°左右的西风为该层主导风向;第3层是在高度20km之上,风速随高度增加而递增,夏季以东风为主导风向,春季、秋季、冬季类似,随高度的增加从270°左右西风过渡到西南风。近十年,酒泉地区在高空西风急流增强和局地环流影响下,冬季的平均风速明显比过去增大,在12月/1月有高空风速的第3个极大值的存在。

This paper is a study of the vertical distribution of atmospheric wind field in Jiuquan area from 2012 to 2021, which the characteristics of daily, monthly, seasonal and interannual changes. According to the characteristics of the wind field, it is divided into a new three-layer structure: the height of the first layer is below 4km, and the wind speed is small and around 2.5 m/s, but the wind direction varies greatly in different seasons. The second layer is an atmospheric wind field with an altitude of 4-20 km. The wind speed first increases with the increase of altitude and then decreases with the increase of altitude. The west wind of about 270 ° is the dominant wind direction in this layer.The third layer is above the altitude of 20 km, and the wind speed increases with the increase of altitude. In summer,the east wind is the dominant wind direction;in spring, autumn and winter, which is similar. With the increase of altitude, it transits from the west wind of about 270 ° to the Southwest wind. In the past decade, under the influence of the strengthening of the upper westerly jet and the local circulation, the average wind speed in winter in Jiuquan area has increased significantly compared with the past, and there is the third maximum of the upper air wind speed in December/January.