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作者

Mingxin Jin;Ranhao Sun;Xiaojun Yang;Ming Yan;Liding Chen

来源

CITIES,Vol.131,Issue1,Article 103982

语言

英文

关键字

作者单位

State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;University of Chinese Academy of Sciences, Beijing 100049, China;Department of Geography, Florida State University, Tallahassee, FL 32306, USA;State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;University of Chinese Academy of Sciences, Beijing 100049, China;Department of Geography, Florida State University, Tallahassee, FL 32306, USA

摘要

The morphology of core city growth can be defined as the area, geometry, and change rate of core city within a specific period. A global analysis of core city growth can help predict future development with respect to different natural and social settings. However, current studies largely focus on limited cities or time series of urban expansion, providing limited insight to assess the status of global sustainable development in urban areas. In this study, we examined the morphological evolution of 2276 cities worldwide from 2003 to 2018 using harmonized nighttime satellite data. We found that during the study period the global core city area increased nearly 52 % with Asia leading the growth (4.5 × 105 km2) and North America growing the least (0.8 × 105 km2). Based on the morphological characteristics, we further identified six city morphological types: decelerated, intensifying, stable, mature, growing, and shrinking. The decelerated type dominated, followed by the intensifying and shrinking types. Cities falling within the other three patterns accounted for about 10 % of the total. Cities with the stable and mature types grew slowly, mainly found in developed regions such as Europe and North America, while cities with the growing type exhibited a high growth rate and were mostly located in developing regions such as Africa and Asia. Moreover, cities with the shrinking pattern were also found in certain developed regions such as Japan, coinciding with the population decline there. Our analysis of global urban morphology 16 years can provide valuable insights into the variations of global core city growth, which are critical for formulating effective policies to achieve urban sustainability.