Urbanization's dual role in the exacerbation and mitigation of drought dynamics in China

Since the 1980s, China’s rapid urbanization has raised significant
concerns about its potential impact on local drought conditions as it
influences ecological, environmental, and meteorological systems, yet its
specific effects on drought duration, severity, and intensity remain
underexplored. This study examines the impact of urbanization on drought
dynamics across mainland Chinese cities using seven decades (1951–2020) of
historical weather station observations. Our analysis suggests that
urbanization plays a dual role in both exacerbating and mitigating drought
conditions. The findings reveal that 50–55% of urban weather observation
stations exhibited exacerbation of drought (ED) dynamics, characterized by
increases in drought duration and severity ranging from +15% to +40%.
Conversely, 45–50% of them demonstrated drought mitigation (MD) effects,
with reductions in these metrics ranging from -15% to -37%. These results
highlight the complex and multifaceted ways in which urbanization
influences drought, varying across different metrics and timescales,
emphasizing the critical need for enhanced attention to urban drought
preparedness, particularly as cities face ongoing urbanization, population
growth, and the impacts of climate change. Integrating sustainable urban
planning with effective water resource management strategies is essential
to address the intricate challenges posed by urban-driven drought
dynamics.