[from the American Geophysical Union, Geophysical Research Letters, 11 August 2025]
Abstract
Although previous studies suggest anthropogenic forcing may influence extreme precipitation probability, few have specifically investigated the human influence on moisture transport. Here, we leverage the 2023 record-breaking summer precipitation in Northern China (NC) to address this gap. Combining station observation with Coupled Model Intercomparison Project Phase 6 (CMIP6) model outputs, we demonstrate that the 2023-like heavy precipitation event was exacerbated by anthropogenic enhanced moisture transport. External forcing increased the probability of extreme southeasterly moisture transport by approximately 1.3 (90% confidence interval: 1.0–1.8) times. Moreover, the total anthropogenic forcing likely increased the probability of similar precipitation events at least 1.7 times (1.0–3.1), with both greenhouse gases and anthropogenic aerosols contributing positively. As greenhouse gases concentrations rise and anthropogenic warming intensifies, the frequency of similar extreme precipitation events in NC is projected to increase further.
Key Points
- Human enhanced moisture transport led to the 2023 summer heaviest precipitation event in Northern China
- Both greenhouse gas and anthropogenic aerosol forcings increased the occurrence probability of heavy precipitation and moisture transport
- The probability of 2023-like precipitation events was projected to increase with future global warming
Plain Language Summary
The extent of human influence on moisture transport and consequent heavy precipitation remains a critical research question. While anthropogenic contributions to precipitation extremes are increasingly recognized, studies specifically addressing human-induced changes in moisture transport remain limited. The record-breaking summer precipitation in Northern China (NC) during 2023 provides a salient case study. This extreme event was fueled by substantial moisture transport from the southeast into NC, driven by Typhoons Doksuri and Khanun. Attribution analyses indicate that both greenhouse gas and anthropogenic aerosol emissions likely increased the probability of similar heavy precipitation events and associated moisture transport patterns. Such events are projected to become more frequent with continued anthropogenic warming. These findings demonstrate that human activities significantly influence moisture transport pathways and consequently modulate extreme precipitation occurrence in NC, deepening our understanding of the physical mechanisms underlying these events.
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