Article
Geosciences, Multidisciplinary
Cynthia Soued, John A. Harrison, Sara Mercier-Blais, Yves T. Prairie
Summary: Reservoirs are crucial for human societies, but their carbon emissions have a significant impact on global climate change. This study reveals that global reservoir carbon emissions peaked in 1987 and have been gradually declining since, mainly due to decreasing carbon dioxide emissions as reservoirs age. However, reservoir-induced radiative forcing continues to rise due to ongoing increases in reservoir methane emissions.
Article
Environmental Sciences
Sarah Waldo, Bridget R. Deemer, Lucas S. Bair, Jake J. Beaulieu
Summary: This study presents initial greenhouse gas emission measurements from Lake Powell, a reservoir in a desert region, and finds that CO2-eq emissions from the littoral regions are higher than the global average, while emissions from the main reservoir are lower. Factoring these emissions into hydropower production shows lower GHG emissions compared to fossil-fuel energy sources.
ENVIRONMENTAL SCIENCE & POLICY
(2021)
Article
Environmental Sciences
Juping Huang, Weiyang Zhao, Zhe Li, Yangming Ou, Lu Lin
Summary: This paper proposes a new methodology for estimating CO2 emissions in reservoirs by combining the floating chamber method and the thin boundary layer method and using numerical simulation to improve the estimation accuracy. In a demonstration study conducted in nine locations in the Xiangjiaba Reservoir, the total CO2 emission in the reservoir was estimated to be approximately 1.37 kg/s. This study is expected to provide a new approach and technical support for accurately estimating CO2 emissions in reservoirs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Juping Huang, Zhe Li
Summary: In this study, a computational fluid dynamic (CFD) modeling approach was proposed to estimate gross carbon emissions in reservoirs. The hydrodynamic model considered factors such as water level, flow velocity, surface turbulence, and air-water transfer velocity of carbon fluxes. The Xiangjiaba Reservoir was used as a case study, and the variations in water level and discharge were found to significantly affect carbon emissions, particularly during the initial impoundment period.
Article
Environmental Sciences
Annika Linkhorst, Jose R. Paranaiba, Raquel Mendonca, David Rudberg, Tonya DelSontro, Nathan Barros, Sebastian Sobek
Summary: The study found that in tropical regions, CH4 emissions from reservoirs are primarily through bubble ebullition, with emission levels significantly influenced by spatial and temporal variability. High spatial resolution measurements are crucial for constraining CH4 estimates at the reservoir-wide level, and different upscaling approaches yielded similar results.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Ecology
Sarah Waldo, Jake J. Beaulieu, William Barnett, D. Adam Balz, Michael J. Vanni, Tanner Williamson, John T. Walker
Summary: This study investigates the temporal patterns and biophysical drivers of methane emissions from a small eutrophic reservoir, revealing spatial and temporal variability in CH4 emission within the reservoir. The findings highlight the importance of trophic status and intra-reservoir variability in assumptions about upscaling CH4 emissions.
Article
Environmental Sciences
Muhammad Adnan Bashir, Zhao Dengfeng, Muhammad Farhan Bashir, Syed Rahim, Zhang Xi
Summary: This study analyzes the impact of economic and environmental indicators on carbon and greenhouse gas emissions in 29 OECD countries from 1990 to 2018. The findings suggest that export diversification has a negative effect on carbon emissions but promotes greenhouse gas emissions. Institutional quality, economic growth, financial development contribute to reducing carbon emissions but increasing greenhouse gas emissions. In contrast, trade openness has a positive influence on carbon emissions but a negative influence on greenhouse gas emissions. Additionally, urbanization is identified as one of the major factors contributing to environmental degradation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Zakaria El Hathat, V. Raja Sreedharan, V. G. Venkatesh, Tarik Zouadi, Manimuthu Arunmozhi, Yangyan Shi
Summary: As the world faces climate change challenges, customers, business leaders, and governments are concerned about greenhouse gas emissions and energy consumption in production cycles. This study focuses on offsetting carbon emissions in the food supply chain in Morocco by mapping the supply chain and analyzing the environmental impact. The study utilizes machine learning-based prediction models to analyze different phases of tomato production and proposes a novel decision-making approach for sustainable production.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Michaela L. de Melo, Cristian R. Teodoru, Paul A. del Giorgio
Summary: This study conducted a large-scale survey of 23 major rivers in northern Quebec, finding significant variations in the concentrations of different carbon species, with methane showing the greatest variability. The study also found that the concentration of dissolved organic carbon decreased with an increase in water surface coverage, suggesting that it may primarily originate from water-land interfaces. Furthermore, for heavily dammed rivers, carbon emissions to the atmosphere approached the carbon export component. These findings are crucial for accurately quantifying carbon cycling in boreal rivers, understanding the sources and sinks of carbon, and predicting their responses to anthropogenic pressures and dynamic climate conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Enrico Marinelli, Serena Radini, Alessia Foglia, Nicola Lancioni, Alberto Piasentin, Anna Laura Eusebi, Francesco Fatone
Summary: This paper proposes a new regional methodological approach for determining direct and indirect emissions from wastewater treatment plants, and assesses a territorial wastewater treatment service in northern Italy. The study highlights the importance of dissolved greenhouse gases in emissions, as well as the significant impact of energy consumption on indirect emissions.
Article
Environmental Sciences
Lei Zhou, Jinxin Zhang, Xuenan Zhang, Jinhua Zhang
Summary: This paper scientifically measures and calculates carbon emissions in China's animal husbandry from 1997 to 2017 based on soil and water resources, and analyzes its time-order characters, structural characters, driving factors, and decoupling relationships. The major findings are as follows: the carbon emission of China's animal husbandry increased with an average annual growth rate of 0.24%, and the contribution of cattle, pigs, and sheep to carbon emissions was as high as 98.15%. Factors reducing carbon emissions included carbon intensity, agricultural industrial structure, agricultural population-water resources matching, agricultural water-soil resources, and per capita cultivated land area. The decoupling between carbon emissions in China's animal husbandry and economic growth was generally weak from 1997 to 2017.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Environmental Sciences
Qiang Liu, Kudakwashe Meki, Hao Zheng, Yanfei Yuan, Mengying Shao, Xianxiang Luo, Xiaoyun Li, Zhixiang Jiang, Fengmin Li, Baoshan Xing
Summary: Salt-affected soils urgently need to be remediated to achieve carbon neutrality and food security. Limited reviews are available on biochar performance in remediating salt-affected soils in the context of carbon neutrality and climate change mitigation. This work summarized the two pathways to achieve carbon neutrality during remediating salt-affected soils using biochars, i.e., biochar production from sustainable feedstock using thermal technologies, application for promoting plant productivity and mitigating greenhouse gas (GHG) emission.
Article
Engineering, Environmental
Xiaojuan Guo, Jia Liu, Defu Liu, Zhengjian Yang, Shangbin Xiao, Andreas Lorke
Summary: Reservoirs are significant sources of nitrous oxide, but there is limited understanding of N2O emissions from the world's largest reservoirs. A study on a tributary bay of Three Gorges Reservoir found that N2O emissions were reduced after impoundment, highlighting the importance of hydraulic conditions on N2O emissions from large reservoirs.
Article
Environmental Sciences
Felipe Rust, Pascal Bodmer, Paul Del Giorgio
Summary: This study investigates the spatial and temporal patterns of CO2 and CH4 concentrations in a newly created hydroelectric reservoir system, revealing the significant impact of flooding on greenhouse gas emissions. The results show strong seasonality and high spatial heterogeneity within reservoirs, with reservoir characteristics and climatic factors identified as the main drivers. The study emphasizes the need for accurate modeling to estimate diffusive carbon emissions from reservoirs and provides a modeling framework for future research.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ram L. Ray, Vijay P. Singh, Sudhir K. Singh, Bharat S. Acharya, Yiping He
Summary: This study investigated the impacts of COVID-19 lockdown measures on global carbon emissions, showing that strict lockdown measures significantly reduced carbon emissions globally. However, the reduction is not sustainable in the long run as global economic activities are expected to return to normal.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Siyue Li, Jiachen Luo, Y. Jun Xu, Liuqing Zhang, Chen Ye
Summary: This study investigated the characteristics of DOM in monsoonal headwater streams of Asia using fluorescence spectroscopy, finding that allochthonous compounds dominate the DOM signal and that hydrological seasonality and nutrients play a key role in modulating DOM sources and components in these streams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shijie Gu, Y. Jun Xu, Siyue Li
Summary: This study assesses the effects of land use on pCO(2) dynamics in seven headwater tributary rivers in Central China. The results show that the pCO(2) level increases with stream order and exhibits seasonal variations. Riverine pCO(2) is positively related to urban and cropland percentage, while negatively related to forest land percentage. The study also finds significant relationships between pCO(2) and TN, TP, DO, and DOC concentrations in the low-order streams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shijie Gu, Siyue Li, Isaac R. Santos
Summary: This study investigates the CO2 emissions from monsoonal rivers in the Han River drainage to the Yangtze in China and reveals the significant impact of anthropogenic land use on riverine CO2 emissions. The findings indicate that agricultural and urban land activities contribute to increased CO2 emissions, while forest cover is negatively correlated with CO2 emissions. The study highlights the importance of considering land use in estimating riverine CO2 emissions and suggests reforestation as a strategy to improve the carbon balance of rivers.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: Rapid urbanization significantly alters carbon biogeochemical cycle and river hydrology. This study found that urban land use increases the levels of dissolved organic matter (DOM) and its autochthonous sources in rivers. Urban-induced nutrient enrichment also contributes to the increased DOM production in rivers.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: The sources and quality of DOM in streams are influenced by the landscape and season, and serve as good indicators of pCO2.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Maofei Ni, Siyue Li
Summary: The biological degradation of DOM plays a crucial role in regulating the structure and fate of DOM in river ecosystems. In addition to labile compounds, recalcitrant compounds also contribute significantly to riverine DOM biodegradation. The incomplete degradation of refractory DOM from high-molecular to low-molecular weight compounds and the influence of elevated temperature on DOM bio-mineralization are observed. These findings provide new insights into the continuous biodegradation of DOM and its impact on carbon cycling.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Environmental Sciences
Xing Li, Y. Jun Xu, Maofei Ni, Chunlin Wang, Siyue Li
Summary: This study reveals the spatio-temporal variations of nitrate sources and transformations in a mixed land use/land cover catchment. It suggests that point sources dominate nitrate in the summer and winter, while non-point sources dominate in the spring and autumn. The increase in urban areas leads to an increase in nitrate concentrations from domestic sewage, and both urban and agricultural inputs should be considered in nitrate pollution management.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Tianyang Li, Chuan Liang, Binghui He, Siyue Li
Summary: This study examined the effects of cornstalk mulching on the dissolved organic carbon (DOC) in runoff. The results showed significantly higher concentrations and losses of DOC in mulched plots compared to bare plots. Specifically, runoff DOC was 52.6% and 53.2% higher in mulched plots than in bare plots under 90 mm/h rainfall intensity (p<0.05).
LAND DEGRADATION & DEVELOPMENT
(2023)
Article
Engineering, Environmental
Wei Tang, Y. Jun Xu, Maofei Ni, Siyue Li
Summary: We investigated the influence of land use/land cover types on carbon dioxide and methane concentrations and diffusion in tributaries of the Longchuan River in China. Our study utilized the headspace equilibration method and CO2SYS program to analyze data collected during the dry and wet seasons from 2017 to 2019. The results showed that urban land area expansion significantly increased CO2 partial pressure, while stream order and flow velocity were inversely related to the levels of corrected pCO2 and dissolved CH4. Land use types had a stronger explanatory ability on pCO2 and dCH4 variations at the reach scale compared to the riparian and catchment scales. Moreover, urban land had a greater impact on corrected pCO2 and dCH4 compared to cropland, grassland, and forest land during the wet season. Overall, our findings emphasize the importance of considering land use at different scales when studying dissolved carbon gases in low-order streams.
Article
Environmental Sciences
Chunlin Wang, Yuhan Xv, Siyue Li, Xing Li
Summary: Urban river-lake systems are hotspots for CO2 and CH4 emissions, with higher emissions from urban rivers compared to lakes. The river-lake connection alters nutrient concentrations, affecting greenhouse gas emissions.
Article
Chemistry, Analytical
Yiguang Qian, Ziyu Chen, Jiahui Wang, Man Peng, Shenghua Zhang, Xiaoyu Yan, Xiaole Han, Xiaohui Ou, Jie Sun, Siyue Li, Ke Chen
Summary: Stable isotope-assisted metabolomics (SIAM) is a powerful tool for discovering transformation products (TPs) of contaminants. In-house H/D exchange reactions enable direct H-2 labeling to target analytes with favorable reaction conditions, providing cost-effective H-2-labeled contaminants of emerging concern (CECs). This study combines the use of in-house H/D exchange and H-2-SIAM to discover potential TPs of 6PPD and proposes a new strategy for finding TPs of CECs.
ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Bingjie Ma, Ping Jiang, Siyue Li
Summary: Urban lakes are important sources of methane emissions, especially in highly-eutrophic areas. This study measured methane concentrations and diffusion from four urban lakes in subtropical China and found that nutrient enrichment significantly increased methane concentrations and fluxes. It also revealed that urban sewage inflow is a key factor in promoting methane production and diffusive emissions. The study highlights the need for effective control measures to reduce methane emissions from urban lakes.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: Urban lakes in Central China showed shifting patterns of CO2 source-sink dynamics influenced by algal growing season and trophic state.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Civil
Yongmei Ma, Maofei Ni, Shijie Gu, Liuqing Zhang, Siyue Li
Summary: In this study, samples were collected from the Daning River, a typical karst river in the Yangtze River mountain landscapes, during both the wet and dry seasons. The molecular compositions, optical properties, and sources of dissolved organic matter (DOM) were investigated using various methods. The results revealed that monsoonal climate and biogeochemical processes were the main factors influencing DOM components and sources. Additionally, the analysis of DOM can aid in identifying potential contaminants and understanding water quality variations.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Environmental
Danni Yuan, Y. Jun Xu, Shiwang Ma, Jingquan Le, Kairui Zhang, Rongli Miao, Siyue Li
Summary: Through a mesocosm experiment, this study found that nitrogen addition and climate warming have a combined effect on the level of CO2 in shallow lakes, indicating that eutrophic shallow lakes would face a double crisis in the future climate. The addition of nitrogen and warming also alter the phytoplankton community structure, suggesting a potential shift in the biological system of shallow lakes under changing climate. Therefore, reducing nitrogen pollution is crucial for the sustainable development of shallow lake systems.