今年北方秋天为何这么短？找到原因了！

Core Viewpoint - The article discusses the shortening of autumn in China, highlighting that the season is becoming shorter and arriving later due to climate change and other meteorological factors [1][3][5]. Summary by Sections Autumn Duration Changes - Autumn in various regions of China is generally short, with the southwest having the longest duration of about 70 to 80 days, while northeastern and northern regions experience only around 50 days [1]. - Data from 1991 to 2020 shows that many areas in eastern China have seen a delay in the onset of autumn, with cities like Zhengzhou, Ningbo, and Shenzhen experiencing delays of over 10 days [1][3]. Meteorological Analysis - Climate change has led to rising temperatures, affecting agricultural production, social economy, and daily life [3]. - Research indicates that not only is autumn arriving later, but the lengths of winter, spring, and autumn are also decreasing, with northern regions showing more significant changes than southern ones [3][5]. Specific Regional Observations - Major cities such as Changsha, Ningbo, and Hangzhou have seen a notable reduction in autumn length, with Ningbo experiencing a decrease of 12 days since the 1990s [5]. - This year, northern regions feel that autumn is particularly short due to increased rainfall and reduced sunlight, with some areas experiencing only about a month of autumn [6]. Winter Predictions - The article raises questions about whether this winter will be particularly cold, noting that the strongest cold air mass of the year is expected to affect many regions [7]. - Predictions suggest that winter temperatures may be close to or slightly above the historical average, but with significant fluctuations [7]. Temperature Trends - The article forecasts that northern regions will continue to experience lower temperatures, while southern regions will see a gradual return to normal seasonal temperatures [8].