为何此次沙尘影响范围这么大 ？冬天也会有沙尘吗？专家解读

Core Viewpoint - The recent sandstorm in northern China is the most intense and widespread of the year, caused by multiple factors including lack of snow cover and high temperatures in sand source areas [1][4]. Group 1: Weather Conditions - The sand source areas in western Inner Mongolia, Gansu Hexi, and northern Ningxia have experienced a lack of snow cover and temperatures 2-4°C higher than usual, leading to low soil moisture levels conducive to sand lifting [1][4]. - A typical cold high-pressure system combined with a Mongolian cyclone has created a significant pressure gradient, resulting in extreme wind conditions with gusts reaching 9-10 levels [4]. - The strong winds are expected to last over 30 hours, causing substantial sand lifting and rapid downstream spread of dust [4]. Group 2: Affected Regions and Recommendations - From February 21 to 22, areas including eastern and southern Xinjiang, central Gansu, and most of Inner Mongolia, among others, are expected to experience dust storms, with some regions facing severe conditions [4]. - It is advised to reduce outdoor activities and take respiratory protection measures due to low visibility and potential health risks [4].