Jiamin Ou

Utrecht University

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Junyu Zheng

South China University of Technology

Zhijiong Huang

Jinan University

Dabo Guan

Tsinghua University

Jing Meng

University College London

Yuli Shan

University of Birmingham

Zhifu Mi

University College London

Heran Zheng

University College London

Zibing Yuan

South China University of Technology

Yuanqian Xu

Zhengzhou University of Light Industry

Min Shao

Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality

Cooperative Institutions

Chinese Academy of Sciences

South China University of Technology

Peking University

Jinan University

University of Chinese Academy of Sciences

Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality

Tsinghua University

Sun Yat-sen University

State Key Joint Laboratory of Environment Simulation and Pollution Control

University of East Anglia

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Leveraging opportunity of low carbon transition by super-emitter cities in China

Science Bulletin (2023)

Heran Zheng Zengkai Zhang Erik Dietzenbacher Ya Zhou Johannes Többen

Chinese cities are core in the national carbon mitigation and largely affect global decarbonisation initiatives, yet disparities between cities challenge country-wide progress. Low-carbon transition should preferably lead to a convergence of both equity and mitigation targets among cities. Inter-city supply chains that link the production and consumption of cities are a factor in shaping inequality and mitigation but less considered aggregately. Here, we modelled supply chains of 309 Chinese cities for 2012 to quantify carbon footprint inequality, as well as explored a leverage opportunity to achieve an inclusive low-carbon transition. We revealed significant carbon inequalities: the 10 richest cities in China have per capita carbon footprints comparable to the US level, while half of the Chinese cities sit below the global average. Inter-city supply chains in China, which are associated with 80% of carbon emissions, imply substantial carbon leakage risks and also contribute to socioeconomic disparities. However, the significant carbon inequality implies a leveraging opportunity that substantial mitigation can be achieved by 32 super-emitting cities. If the super-emitting cities adopt their differentiated mitigation pathway based on affluence, industrial structure, and role of supply chains, up to 1.4 Gt carbon quota can be created, raising 30% of the projected carbon quota to carbon peak. The additional carbon quota allows the average living standard of the other 60% of Chinese people to reach an upper-middle-income level, highlighting collaborative mechanism at the city level has a great potential to lead to a convergence of both equity and mitigation targets.

Equity

Carbon Footprint

10.1016/j.scib.2023.08.016

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Citations (16)

Excess Molar Volumes and Surface Tensions of Xylene with 2-Propanol or 2-Methyl-2-propanol at 298.15 K

Journal of Chemical & Engineering Data (2002)

Gangfeng Ouyang Zhongqi Huang Jiamin Ou Wenqian Wu Bei-Sheng Kang

Densities for binary mixtures of (2-propanol + o-xylene, + m-xylene, + p-xylene, 2-methyl-2-propanol + o-xylene, + m-xylene, and + p-xylene) have been determined at 298.15 K, and excess molar volumes have been derived. Surface tension of these binary mixtures have been measured at 298.15 K by the pendant drop method, and the values of the surface tension deviation for these mixtures were also calculated.

Propanol

1-Propanol

o-Xylene

p-Xylene

m-Xylene

10.1021/je0256028

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Citations (51)

Hidden dependence of spreading vulnerability on topological complexity

Physical review. E (2022)

Mark Dekker Raoul Schram Jiamin Ou Debabrata Panja

Many dynamical phenomena in complex systems concern spreading that plays out on top of networks with changing architecture over time-commonly known as temporal networks. A complex system's proneness to facilitate spreading phenomena, which we abbreviate as its "spreading vulnerability," is often surmised to be related to the topology of the temporal network featured by the system. Yet, cleanly extracting spreading vulnerability of a complex system directly from the topological information of the temporal network remains a challenge. Here, using data from a diverse set of real-world complex systems, we develop the "entropy of temporal entanglement" as a quantity to measure topological complexities of temporal networks. We show that this parameter-free quantity naturally allows for topological comparisons across vastly different complex systems. Importantly, by simulating three different types of stochastic dynamical processes playing out on top of temporal networks, we demonstrate that the entropy of temporal entanglement serves as a quantitative embodiment of the systems' spreading vulnerability, irrespective of the details of the processes. In being able to do so, i.e., in being able to quantitatively extract a complex system's proneness to facilitate spreading phenomena from topology, this entropic measure opens itself for applications in a wide variety of natural, social, biological, and engineered systems.

Complex system

Vulnerability

10.1103/physreve.105.054301

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Citations (6)

Variability in real-world emissions and fuel consumption by diesel construction vehicles and policy implications

The Science of The Total Environment (2021)

Cheng Li Min Cui Junyu Zheng Yingjun Chen Junwen Liu

Consumption

Oil consumption

10.1016/j.scitotenv.2021.147256

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Citations (37)

Concentrations and sources of non-methane hydrocarbons (NMHCs) from 2005 to 2013 in Hong Kong: A multi-year real-time data analysis

Atmospheric Environment (2014)

Jiamin Ou Hai Guo Junyu Zheng Kalam Cheung Peter K.K. Louie

Isoprene

10.1016/j.atmosenv.2014.12.048

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Citations (99)

Frequent interactions of Tibet's CO₂ emissions with those of other regions in China

Earth s Future (2019)

Jiamin Ou Jing Meng Heran Zheng Zhifu Mi Yuli Shan

Abstract Tibet is usually missing from China's emission accounts, especially from those of consumption‐based emissions. In this study, we developed a multiregional input‐output table for 31 provinces in China and examined the production‐ and consumption‐based characteristics of Tibet's CO 2 emissions in 2012. Results show that the consumption‐based CO 2 emissions in Tibet (18.8 Mt, similar to Guinea's emissions in 2015) were three times as high as the production‐based estimate (6.2 Mt). Tibet displays unique emission patterns with the highest ratio of consumption‐ to production‐based emissions in China, which are more similar with the east developed provinces rather than its counterparts in west China. More than half of Tibet's consumption‐based emissions are supported by Qinghai, Hebei, Sichuan, and others, enabled by the Qinghai‐Tibet railway that connected Tibet to China's national railway system. High carbon footprint but low life expectancy is found in Tibet, suggesting the emerging need of a more sustainable consumption pathway under the intensifying interregional connections by Belt and Road Initiative.

Consumption

Carbon Footprint

10.1029/2018ef001059

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Citations (19)

Origin and Radiative Forcing of Black Carbon Aerosol: Production and Consumption Perspectives

Environmental Science & Technology (2018)

Jing Meng Junfeng Liu Kan Yi Haozhe Yang Dabo Guan

Air pollution, a threat to air quality and human health, has attracted ever-increasing attention in recent years. In addition to having local influence, air pollutants can also travel the globe via atmospheric circulation and international trade. Black carbon (BC), emitted from incomplete combustion, is a unique but representative particulate pollutant. This study tracked down the BC aerosol and its direct radiative forcing to the emission sources and final consumers using the global chemical transport model (MOZART-4), the rapid radiative transfer model for general circulation simulations (RRTM), and a multiregional input–output analysis (MRIO). BC was physically transported (i.e., atmospheric transport) from western to eastern countries in the midlatitude westerlies, but its magnitude is near an order of magnitude higher if the virtual flow embodied in international trade is considered. The transboundary effects on East and South Asia by other regions increased from about 3% (physical transport only) to 10% when considering both physical and virtual transport. The influence efficiency on East Asia was also large because of the comparatively large emission intensity and emission-intensive exports (e.g., machinery and equipment). The radiative forcing in Africa imposed by consumption from Europe, North America, and East Asia (0.01 Wm–2) was even larger than the total forcing in North America. Understanding the supply chain and incorporating both atmospheric and virtual transport may improve multilateral cooperation on air pollutant mitigation both domestically and internationally.

Forcing (mathematics)

Consumption

10.1021/acs.est.8b01873

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Citations (37)

High Gaseous Nitrous Acid (HONO) Emissions from Light-Duty Diesel Vehicles

Environmental Science & Technology (2020)

Songdi Liao Jiachen Zhang Fei Yu Manni Zhu Junwen Liu

Nitrous acid (HONO) plays an important role in the budget of hydroxyl radical (•OH) in the atmosphere. Vehicular emissions are a crucial primary source of atmospheric HONO, yet remain poorly investigated, especially for diesel trucks. In this study, we developed a novel portable online vehicular HONO exhaust measurement system featuring an innovative dilution technique. Using this system coupled with a chassis dynamometer, we for the first time investigated the HONO emission characteristics of 17 light-duty diesel trucks (LDDTs) and 16 light-duty gasoline vehicles in China. Emissions of HONO from LDDTs were found to be significantly higher than previous studies and gasoline vehicles tested in this study. The HONO emission factors of LDDTs decrease significantly with stringent control standards: 1.85 ± 1.17, 0.59 ± 0.25, and 0.15 ± 0.14 g/kg for China III, China IV, and China V, respectively. In addition, we found poor correlations between HONO and NOx emissions, which indicate that using the ratio of HONO to NOx emissions to infer HONO emissions might lead to high uncertainty of HONO source budget in previous studies. Lastly, the HONO emissions are found to be influenced by driving conditions, highlighting the importance of conducting on-road measurements of HONO emissions under real-world driving conditions. More direct measurements of the HONO emissions are needed to improve the understanding of the HONO emissions from mobile and other primary sources.

Nitrous acid

10.1021/acs.est.0c05599

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Citations (79)

A Feasible Methodological Framework for Uncertainty Analysis and Diagnosis of Atmospheric Chemical Transport Models

Environmental Science & Technology (2019)

Zhijiong Huang Junyu Zheng Jiamin Ou Zhijiong Huang Yuqi Wu

The current state of quantifying uncertainty in chemical transport models (CTM) is often limited and insufficient due to numerous uncertainty sources and inefficient or inaccurate uncertainty propagation methods. In this study, we proposed a feasible methodological framework for CTM uncertainty analysis, featuring sensitivity analysis to filter for important model inputs and a new reduced-form model (RFM) that couples the high-order decoupled direct method (HDDM) and the stochastic response surface model (SRSM) to boost uncertainty propagation. Compared with the SRSM, the new RFM approach is 64% more computationally efficient while maintaining high accuracy. The framework was applied to PM2.5 simulations in the Pearl River Delta (PRD) region and found five precursor emissions, two pollutants in lateral boundary conditions (LBCs), and three meteorological inputs out of 203 model inputs to be important model inputs based on sensitivity analysis. Among these selected inputs, primary PM2.5 emissions, PM2.5 concentrations of LBCs, and wind speed were identified as key uncertainty sources, which collectively contributed 81.4% to the total uncertainty in PM2.5 simulations. Also, when evaluated against observations, we found that there were systematic underestimates in PM2.5 simulations, which can be attributed to the two-product method that describes the formation of secondary organic aerosol.

Propagation of uncertainty

Sensitivity Analysis

10.1021/acs.est.8b06326

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Citations (23)

Supplementary material to "Decadal evolution of ship emissions in China from 2004 to 2013 by using an integrated AIS-based approach and projection to 2040"

Cheng Li Jens Borken Junyu Zheng Zibing Yuan Jiamin Ou

10.5194/acp-2017-743-supplement

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