Global scale assessment of urban precipitation anomalies

• 成果类型: Article
• 署名作者: Sui, Xinxin; Yang, Zong - Liang; Shepherd, Marshall; Niyogi, Dev
• 署名单位: University of Texas System; University of Texas Austin; University of Texas System; University of Texas Austin; University System of Georgia; University of Georgia
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-10212
• DOI: 10.1073/pnas.2311496121
• 发表日期: 2024-09-17
• 关键词: climate; urbanization; rainfall; impacts

摘要

Urbanization has accelerated dramatically across the world over the past decades. in climatological datasets. Although prior research has investigated urban influences on precipitation for specific cities or selected thunderstorm cases, a comprehensive examination of urban precipitation anomalies on a global scale remains limited. This research is a global analysis of urban precipitation anomalies for over one thousand cities worldwide. We find that more than 60% of the global cities and their downwind regions are receiving more precipitation than the surrounding rural areas. Moreover, the magnitude of these urban wet islands has nearly doubled in the past 20 y. Urban precipitation anomalies exhibit variations across different continents and climates, with cities in Africa, for example, exhibiting the largest urban annual and extreme precipitation anomalies. Cities are more prone to substantial urban precipitation anomalies under warm and humid climates compared to cold and dry climates. Cities with larger populations, pronounced urban heat island effects, and higher global urban rainfall hotspots, establishing a foundation for the consideration of urban rainfall corrections in climatology datasets. This advancement holds promise for projecting extreme precipitation and fostering the development of more resilient cities in the future.