十月南北“两重天”影响几何？

Core Viewpoint - The article discusses the significant weather differences between northern and southern China in October, highlighting the impact on agriculture and public health due to the contrasting conditions of cold and wet in the north versus hot and dry in the south [1][2]. Weather Disparity - Northern regions, including Northwest, North China, and Huanghuai, have experienced increased rainfall, while southern areas like Jiangxi, Zhejiang, Fujian, and northern Guangdong have seen temperatures exceeding 35°C, with some places reaching above 38°C [2][3]. Causes of Weather Differences - The disparity is attributed to the influence of the subtropical high-pressure system, which creates a "moisture transport belt" that brings warm, moist air from the sea to the north, leading to prolonged autumn rains in the northwest and North China [3][4]. Agricultural Impact - The contrasting weather poses challenges for agricultural production, particularly during the autumn harvest and planting season. In the north, excessive rainfall has led to waterlogged soils, delaying the harvest of corn and affecting winter wheat planting [5][6]. - In the south, high temperatures can negatively impact crops like rice, causing early root aging and reduced yield due to high-temperature stress [6]. Health Implications - The unusual weather patterns also affect public health, with increased cases of respiratory diseases in the north due to cold and damp conditions, while the south faces risks of heat-related illnesses [7][8][9]. - Health experts recommend precautions for vulnerable populations, including maintaining warmth in cold conditions and managing hydration and heat exposure in hot weather [8][9].