沙尘天气为何频袭西北地区？如何预防？

Group 1 - The core viewpoint is that the frequency of sandstorm weather in the northwest region of China has increased, with some areas even experiencing sandstorms in summer, which is considered an abnormal weather condition [1][2] - Sandstorm weather typically occurs in arid and semi-arid regions, requiring three conditions: the presence of ground dust material, strong wind dynamics, and an unstable atmospheric environment [1] - The current increase in sandstorm events is attributed to the active phase of Mongolian cyclones, increased cold air activity, and insufficient precipitation in the northwest region, leading to dry soil and abundant dust material [1][2] Group 2 - The rise in sandstorm occurrences during summer is linked to rapid temperature increases and low moisture content in the atmosphere, which can lead to dry convection and the development of strong sandstorms [2] - Global climate change is contributing to increased saturation vapor pressure in the atmosphere, resulting in prolonged dry spells or heavy rainfall events, both of which heighten the likelihood of sandstorm occurrences [2] - The adverse effects of frequent sandstorms on daily life and production necessitate public awareness and preventive measures, including monitoring weather changes and adhering to health advisories [3]