Core Insights - The summer rainy season in North China has set records for both duration and rainfall, marking the strongest rainy season since 1961 [1][2] - The rainy season began on July 5, 2023, which is 13 days earlier than the average, and ended on September 2, 2023, 16 days later than usual, resulting in a total duration of 29 days longer than the average [1][2] - Cumulative rainfall reached 356.6 mm, exceeding the average by 161.1%, establishing a historical high since 1961 [1] Climate Factors - The early onset of the rainy season is attributed to the abnormal northward movement of the subtropical high-pressure system, which has been influenced by climate change and ocean temperature anomalies [2] - The subtropical high-pressure system has been stronger and positioned further north than in previous years, contributing to increased moisture transport to North China [2] Long-term Trends - There is a linear increasing trend in rainfall during the rainy season in North China since the 21st century, although no significant increase is observed over a longer time frame from 1961 to 2024 [3] - Historical data indicates that years with rainfall exceeding 300 mm occurred primarily in the 1980s and 1990s [3] Weather Patterns - The combination of global warming and the early rainy season has led to increased humidity and prolonged high temperatures, resulting in a shift from dry heat to humid heat in North China's summers [4] - The frequency of humid heat events has increased significantly compared to dry heat events since 1981, with a growth rate of 2 to 3 times [4] Climate Change Implications - The record-breaking rainy season is seen as a localized manifestation of climate change, with rising atmospheric moisture and urban heat island effects contributing to more frequent and intense extreme rainfall events [4]
雨量创纪录 华北真的更湿润了吗？
Xin Hua She·2025-09-05 14:07