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"Megacities"
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Ghost cities
Ghost cities -- inspired by the vacant, uninhabited megacities of China -- follows multiple narratives, including one in which a young man named Xiang is fired from his job as a translator at Sydney's Chinese Consulate after it is discovered he doesn't speak a word of Chinese and has been relying entirely on Google Translate for his work. How is his relocation to one such ghost city connected to a parallel odyssey in which an ancient Emperor creates a thousand doubles of Himself? Or where a horny mountain gains sentience? Where a chess-playing automaton hides a deadly secret? Or a tale in which every book in the known Empire is destroyed -- then recreated, page by page and book by book -- all in the name of love and art?
Book
The Routledge Handbook of Planning Megacities in the Global South
Cities are now home to 55% of the world’s population, and that number is rising. Urban populations across the world will continue to grow, including in megacities with populations over ten million. In 2016 there were 31 megacities globally, according to the United Nations’ World Cities Report, with 24 of those cities located in the Global South. That number is expected to rise to 41 by 2030, with all ten new megacities in the Global South, where the processes of urbanization are intrinsically distinct from those in the Global North.
The Routledge Handbook of Planning Megacities in the Global South provides rigorous comparative analyses, discussing the challenges, processes, best practices, and initiatives of urbanization in Middle America, South America, the Middle East, Africa, South Asia, East Asia, and Southeast Asia. This book is indispensable reading for students and scholars of urban planning, and its significance as a resource will only continue to grow as urbanization reshapes the global population.
eBook
Comparison of the CASA and InVEST models’ effects for estimating spatiotemporal differences in carbon storage of green spaces in megacities
Urban green space is a direct way to improve the carbon sink capacity of urban ecosystems. The carbon storage assessment of megacity green spaces is of great significance to the service function of urban ecosystems and the management of urban carbon zoning in the future. Based on multi-period remote sensing image data, this paper used the CASA model and the InVEST model to analyze the spatio-temporal variation and driving mechanism of carbon storage in Shenzhen green space and discussed the applicability of the two models to the estimation of carbon storage in urban green space. The research results showed that, from 2008 to 2022, in addition to the rapid expansion of construction land, the area of green space and other land types in Shenzhen showed a significant decrease trend. The estimation results of the carbon storage model showed that the carbon storage of green space shows a significant trend of reduction from 2008 to 2022, and the reduction amounts are 0.8 × 106 t (CASA model) and 0.64 × 106 t (InVEST model), respectively. The evaluation results of the model show that, in megacities, the spatial applicability of InVEST model is lower than that of CASA model, and the CASA model is more accurate in estimating the carbon storage of urban green space. The research results can provide a scientific basis for the assessment of the carbon sink capacity of megacity ecosystems with the goal of \"dual carbon\".
Journal Article
Impacts of Land Cover/Use on the Urban Thermal Environment: A Comparative Study of 10 Megacities in China
Satellite-derived land surface temperature (LST) reveals the variations and impacts on the terrestrial thermal environment on a broad spatial scale. The drastic growth of urbanization-induced impervious surfaces and the urban population has generated a remarkably increasing influence on the urban thermal environment in China. This research was aimed to investigate land surface temperature (LST) intensity response to urban land cover/use by examining the thermal impact on urban settings in ten Chinese megacities (i.e., Beijing, Dongguan, Guangzhou, Hangzhou, Harbin, Nanjing, Shenyang, Suzhou, Tianjin, and Wuhan). Surface urban heat island (SUHI) footprints were scrutinized and compared by magnitude and extent. The causal mechanism among land cover composition (LCC), population, and SUHI was also identified. Spatial patterns of the thermal environments were identical to those of land cover/use. In addition, most impervious surface materials (greater than 81%) were labeled as heat sources, on the other hand, water and vegetation were functioned as heat sinks. More than 85% of heat budgets in Beijing and Guangzhou were generated from impervious surfaces. SUHI for all megacities showed spatially gradient decays between urban and surrounding rural areas; further, temperature peaks are not always dominant in the urban core, despite extremely dense impervious surfaces. The composition ratio of land cover (LCC%) negatively correlates with SUHI intensity (SUHII), whereas the population positively associates with SUHII. For all targeted megacities, land cover composition and population account for more than 63.9% of SUHI formation using geographically weighted regression. The findings can help optimize land cover/use to relieve pressure from rapid urbanization, maintain urban ecological balance, and meet the demands of sustainable urban growth.
Journal Article
From cities to super mega city regions in China in a new wave of urbanisation and economic transition
A mega city region comprises a cluster of highly networked urban settlements anchored by one or more large cities. Substantial studies have been conducted in the 21st century to theorise the development of mega city regions from two perspectives: one focuses on the rationale/challenges of planning and governance while the other focuses on the economic forces that generate the mega city regions. In China, the outstanding position of mega city regions in China’s economic development has been accentuated in both academic research and recent policies. Recent studies have unpacked the political dynamics of mega city regions in China and identified challenges for planning and governance. The present study approaches this issue through another theoretical lens and deciphers the economic process underneath the recent upsurge of Chinese mega city regions. By unfolding the economic transition since the late 1970s to trace the footprints of mega city region development, the paper contributes a discourse of how different waves of economic transition – that is, rural industrialisation, land-centred development and urban tertiarisation – have been steering individual cities towards super mega city regions. The paper also identifies the distinctive challenges confronting the future development of China’s mega city regions, including jurisdictional fragmentation, socio-spatial inequality and environmental externalities, which were created because of the strong bottom-up initiatives in land development during rural industrialisation. New policies and planning are required in response to these challenges as well as to the emerging new industries in the new wave of economic transition (i.e. from labour-intensive industries to the development of high-tech industries).
特大城市区域由一个或多个大城市锚定的高度网络化的城市住区群组成。21世纪的学者们进行了大量研究，从两个角度对特大城市区域的发展进行理论化：一个侧重于规划和治理的理论基础/挑战，另一个侧重于产生特大城市区域的经济力量。在中国，特大城市地区在中国经济发展中的突出地位在学术研究和近期政策中都得到了强调。最近的研究揭示了中国特大城市地区的政策动态，并确定了规划和治理面临的挑战。本研究从另一个理论视角探讨这一问题，解读中国特大城市区域最近的崛起的经济过程。本文呈现了自20世纪70年代末以来的经济转型，从而追踪了特大城市区域发展的足迹。在此基础上，本文探讨了不同的经济转型浪潮—即农村工业化、以土地为中心的开发和城市的第三产业化—如何引导单个城市走向特大城市区域。本文还确定了中国特大城市地区未来发展面临的独特挑战，包括管辖权分散、社会空间不平等和环境外部性，这些挑战是由农村工业化期间强有力的自下而上的土地开发举措造成的。需要新的政策和规划来应对这些挑战以及新一轮经济转型中出现的新产业（即从劳动密集型产业到高技术产业的发展）。
Journal Article
Future global urban water scarcity and potential solutions
Urbanization and climate change are together exacerbating water scarcity—where water demand exceeds availability—for the world’s cities. We quantify global urban water scarcity in 2016 and 2050 under four socioeconomic and climate change scenarios, and explored potential solutions. Here we show the global urban population facing water scarcity is projected to increase from 933 million (one third of global urban population) in 2016 to 1.693–2.373 billion people (one third to nearly half of global urban population) in 2050, with India projected to be most severely affected in terms of growth in water-scarce urban population (increase of 153–422 million people). The number of large cities exposed to water scarcity is projected to increase from 193 to 193–284, including 10–20 megacities. More than two thirds of water-scarce cities can relieve water scarcity by infrastructure investment, but the potentially significant environmental trade-offs associated with large-scale water scarcity solutions must be guarded against.
This paper quantifies global urban water scarcity in 2016 and 2050 and explores potential solutions. One third to nearly half of the global urban population is projected to face water scarcity problems.
Journal Article
Atmospheric new particle formation from sulfuric acid and amines in a Chinese megacity
Atmospheric particulates can be produced by emissions or form de novo. New particle formation usually occurs in relatively clean air. This is because preexisting particles in the atmosphere will scavenge the precursors of new particles and suppress their formation. However, observations in some heavily polluted megacities have revealed substantial rates of new particle formation despite the heavy loads of ambient aerosols. Yao et al. investigated new particle formation in Shanghai and describe the conditions that make this process possible. The findings will help inform policy decisions about how to reduce air pollution in these types of environments. Science , this issue p. 278 Atmospheric new particle formation in heavily polluted cities can occur in certain chemical environments. Atmospheric new particle formation (NPF) is an important global phenomenon that is nevertheless sensitive to ambient conditions. According to both observation and theoretical arguments, NPF usually requires a relatively high sulfuric acid (H 2 SO 4 ) concentration to promote the formation of new particles and a low preexisting aerosol loading to minimize the sink of new particles. We investigated NPF in Shanghai and were able to observe both precursor vapors (H 2 SO 4 ) and initial clusters at a molecular level in a megacity. High NPF rates were observed to coincide with several familiar markers suggestive of H 2 SO 4 –dimethylamine (DMA)–water (H 2 O) nucleation, including sulfuric acid dimers and H 2 SO 4 -DMA clusters. In a cluster kinetics simulation, the observed concentration of sulfuric acid was high enough to explain the particle growth to ~3 nanometers under the very high condensation sink, whereas the subsequent higher growth rate beyond this size is believed to result from the added contribution of condensing organic species. These findings will help in understanding urban NPF and its air quality and climate effects, as well as in formulating policies to mitigate secondary particle formation in China.
Journal Article
Global evidence of rapid urban growth in flood zones since 1985
Disaster losses are increasing and evidence is mounting that climate change is driving up the probability of extreme natural shocks
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–
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. Yet it has also proved politically expedient to invoke climate change as an exogenous force that supposedly places disasters beyond the influence of local and national authorities
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,
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. However, locally determined patterns of urbanization and spatial development are key factors to the exposure and vulnerability of people to climatic shocks
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. Using high-resolution annual data, this study shows that, since 1985, human settlements around the world—from villages to megacities—have expanded continuously and rapidly into present-day flood zones. In many regions, growth in the most hazardous flood zones is outpacing growth in non-exposed zones by a large margin, particularly in East Asia, where high-hazard settlements have expanded 60% faster than flood-safe settlements. These results provide systematic evidence of a divergence in the exposure of countries to flood hazards. Instead of adapting their exposure, many countries continue to actively amplify their exposure to increasingly frequent climatic shocks.
Analysis of high-resolution annual data shows that global human settlements have expanded continuously and rapidly into flood zones, with those in the most hazardous zones increasing by 122% from 1985 to 2015.
Journal Article
Baseline Study on Microplastics in Indian Rivers under Different Anthropogenic Influences
Microplastic particles are found in environmental compartments all over the world and receive a great deal of attention, especially in the aquatic environment. Currently, a particularly high input of microplastics via Asian rivers is assumed, but so far, there are hardly any data through field measurements. Three rivers in South India were considered for this purpose to focus on their microplastic load. The emphasis was on the comparison of microplastic concentrations in urban and rural rivers. While two rivers in the megacity Chennai (Tamil Nadu) were found to have an average microplastic concentration of 0.4 microplastic particles/L, a rural river near Munnar (Kerala) had an average concentration of 0.2 microplastic particles/L. Rough estimates of annual microplastic discharge from the Adyar River (Chennai) into the Bay of Bengal are found to be as high as 11.6 trillion microplastic particles. This study should be one of the first baseline studies for microplastic loads in South Indian streams and should be complemented with further environmental sampling before, during and after the monsoon season to get more detailed information on the storage and transportation of fluvial microplastics under different weather conditions.
Journal Article
Space-based observations of megacity carbon dioxide
Urban areas now house more than half the world's population, and are estimated to contribute over 70% of global energy‐related CO2emissions. Many cities have emission reduction policies in place, but lack objective, observation‐based methods for verifying their outcomes. Here we demonstrate the potential of satellite‐borne instruments to provide accurate global monitoring of megacity CO2 emissions using GOSAT observations of column averaged CO2 dry air mole fraction (XCO2) collected over Los Angeles and Mumbai. By differencing observations over the megacity with those in nearby background, we observe robust, statistically significant XCO2 enhancements of 3.2 ± 1.5 ppm for Los Angeles and 2.4 ± 1.2 ppm for Mumbai, and find these enhancements can be exploited to track anthropogenic emission trends over time. We estimate that XCO2 changes as small as 0.7 ppm in Los Angeles, corresponding to a 22% change in emissions, could be detected with GOSAT at the 95% confidence level. Key Points Existing satellite observations can detect megacity CO2 enhancements These observations can be used to track anthropogenic emissions trends in time
Journal Article