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<p>Quantifying changes in cloudiness is crucial for understanding future atmospheric dynamics. Human activities may drive such changes, yet their role remains poorly characterized within a global framework. Using worldwide satellite observations, here we assessed cloud coverage trends at both regional (IPCC-defined regions) and local scales, focusing on 226 megacities (&#xa0;&gt;&#xa0;1M inhabitants) and 146 midsize cities (0.1-1M). Our findings reveal that: 1) Irrespective of the sign of significant regional trends, the local scale analysis exhibits mainly significant increasing trends of cloud coverage anomaly. 2) Developing economies exhibit the strongest signals: 55-62% of megacities and 42-44% of midsize cities with demographic growth show significant upward trends, particularly coastal cities in tropical climates, underscoring the interaction between urbanization and background climate. 3) Seasonal analyses highlight a stratification of trends by climatological zone, with 64% of megacities exhibiting at least one significant seasonal trend compared to 47% for annual trends.</p><p></p>

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Urban cloud coverage anomaly indicates increasing impacts mainly in developing economies

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月27日

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  • Carlo De Michele,
  • Cristian Bonfanti,
  • Michele Cremaschi,
  • Pierfrancesco Da Ronco

摘要

Quantifying changes in cloudiness is crucial for understanding future atmospheric dynamics. Human activities may drive such changes, yet their role remains poorly characterized within a global framework. Using worldwide satellite observations, here we assessed cloud coverage trends at both regional (IPCC-defined regions) and local scales, focusing on 226 megacities ( > 1M inhabitants) and 146 midsize cities (0.1-1M). Our findings reveal that: 1) Irrespective of the sign of significant regional trends, the local scale analysis exhibits mainly significant increasing trends of cloud coverage anomaly. 2) Developing economies exhibit the strongest signals: 55-62% of megacities and 42-44% of midsize cities with demographic growth show significant upward trends, particularly coastal cities in tropical climates, underscoring the interaction between urbanization and background climate. 3) Seasonal analyses highlight a stratification of trends by climatological zone, with 64% of megacities exhibiting at least one significant seasonal trend compared to 47% for annual trends.