今年冬天是冷冬吗？冷暖起伏大是何原因？专家解读

Core Viewpoint - The article discusses the impact of a strong cold air mass sweeping across China, leading to concerns about the upcoming winter temperatures and the characteristics of seasonal temperature fluctuations in the context of global warming [1][3]. Group 1: Winter Temperature Predictions - The National Climate Center predicts that this winter, temperatures in China will be close to or slightly warmer than the historical average, but with significant fluctuations between cold and warm periods [1][3]. - The warming trend in winter temperatures is evident, with the Arctic experiencing a more pronounced temperature increase compared to tropical and subtropical regions, leading to more extreme temperature variations in China [3]. Group 2: Seasonal Changes - The transition from autumn to winter is typically rapid in many regions of China, contributing to the perception that autumn is shorter [4][7]. - Statistical data indicates that autumn has indeed shortened in many cities, particularly in eastern regions, with cities like Hefei, Guangzhou, and Nanning experiencing a reduction of over 10 days in autumn length compared to historical data [9]. Group 3: Overall Seasonal Length Trends - Despite the perception of a longer winter, most regions in China are experiencing a shortening of winter length due to climate change, with a slight delay in the onset of winter and an earlier arrival of spring [11].