Article
Environmental Sciences
Carly Hansen, Rachel Pilla, Paul Matson, Bailey Skinner, Natalie Griffiths, Henriette Jager
Summary: Greenhouse gas emissions from reservoirs have been evaluated using global models that may not be applicable to all types of reservoirs. This study applied a specific emissions model to a variety of hydropower reservoirs in the US and found that the dominant pathways for GHG emissions were diffusion of carbon dioxide and methane ebullition. The emissions footprint of these reservoirs was less variable and lower compared to larger global reservoirs, highlighting the need to consider the specific characteristics of each reservoir when estimating emissions.
ENVIRONMENTAL RESEARCH COMMUNICATIONS
(2022)
Article
Green & Sustainable Science & Technology
A. Levasseur, S. Mercier-Blais, Y. T. Prairie, A. Tremblay, C. Turpin
Summary: Hydropower is often seen as a low-carbon electricity source, but the flooding caused by dam construction can lead to an increase in biogenic greenhouse gas emissions, which are often overlooked in life cycle assessments. This study compares different methods to estimate hydropower reservoir emissions and finds that they contribute to a portion of the carbon footprint of electricity distributed in the Canadian province of Quebec.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Biodiversity Conservation
Jinquan Li, Junmin Pei, Changming Fang, Bo Li, Ming Nie
Summary: Research shows that wetland CO2 and CH4 emissions have opposite seasonal temperature dependencies, with CO2 emissions decreasing with increasing monthly mean temperature and CH4 emissions showing the opposite pattern. Neglecting this seasonal temperature dependence may lead to an overestimation of wetland greenhouse gas emissions.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Environmental Sciences
Henrique O. Sawakuchi, David Bastviken, Alex Enrich-Prast, Nicholas D. Ward, Plinio B. Camargo, Jeffrey E. Richey
Summary: The study evaluated CH4 dynamics in a tropical run-of-the-river (ROR) reservoir in the Amazon region, showing higher CH4 production in reservoirs' littoral sediment than in naturally flooded areas downstream of the dam. Despite high CH4 oxidation rates in the main channel, the concentration and fluxes of CH4 remained low. Maintaining mixing and oxygenation throughout the reservoir's water column could limit diffusive CH4 emissions from the main channel, while the presence of less oxidized CH4 after the dam suggests the need for further assessment on the reservoir's impact on annual CH4 emissions.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Environmental Sciences
Roseli Frederigi Benassi, Tatiane Araujo de Jesus, Lucia Helena Gomes Coelho, Werner Siegfried Hanisch, Mercia Regina Domingues, Ricardo Hideo Taniwaki, Thais Araujo Goya Peduto, Danilo Oliveira da Costa, Marcelo Luiz Martins Pompeo, William J. Mitsch
Summary: The study indicates that shallow urban polluted reservoirs in tropical regions can be hotspot for CO2 and CH4 emissions, with nutrient-rich conditions leading to increased greenhouse gas emission. High concentrations of nutrients in the water column support the production of autotrophic biomass that contribute to CH4 emission. The findings highlight the importance of water quality improvement and eutrophication mitigation in highly urbanized reservoirs in tropical regions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Forestry
Xin Rao, Chang-An Liu, Jian-Wei Tang, Yu Nie, Ming-Yue Liang, Wei-Jun Shen, Kadambot H. M. Siddique
Summary: Rubber plantations cover a vast area globally, and introducing leguminous shrubs can help reduce CO2 and CH4 emissions while increasing N2O emissions, ultimately improving soil environments. As trees in rubber plantations age, there is a significant decrease in annual emissions of CO2, N2O, and CH4, with rubber-leguminous shrub systems showing potential for enhancing soil organic carbon sequestration.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Reza Hadjiaghaie Vafaie, Ghader Hosseinzadeh
Summary: Due to global temperature rise and climate change, the detection of CO2, SO2, and NO pollutants is crucial in smart cities. In this paper, an H-shaped photoacoustic cell is used for detecting low-concentration gases. The miniaturized and parameter-designed cell enhances efficiency and performance while eliminating issues of bulkiness and cost. The simplified design expands the application rate of the cell in practice.
Article
Multidisciplinary Sciences
Elisa Calamita, Annunziato Siviglia, Gretchen M. Gettel, Mario J. Franca, R. Scott Winton, Cristian R. Teodoru, Martin Schmid, Bernhard Wehrli, Andrea Rinaldo
Summary: Recent studies have shown that tropical hydroelectric reservoirs can emit substantial greenhouse gases to the atmosphere, with downstream emissions varying greatly over different timescales due to reservoir stratification and dam operation. Failing to account for seasonal or subdaily variations in downstream carbon emissions could lead to errors of up to 90% when estimating the reservoir's annual emissions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
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
Physics, Applied
Abdelkader Rahmani, Xavier Aubert, Nicolas Fagnon, Mehrdad Nikravech
Summary: Researchers have developed a low-temperature atmospheric surface dielectric barrier discharge reactor that can transform biogas into liquid chemicals. Results showed conversion rates of 44% for CH4 and 22% for CO2 under specific operational conditions, with the lowest energetic cost of 26 eV/molecule and a selectivity of 3 wt. % for liquid hydrocarbons in the products.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Geosciences, Multidisciplinary
Giulia Zazzeri, Heather Graven, Xiaomei Xu, Eric Saboya, Liam Blyth, Alistair J. Manning, Hannah Chawner, Dien Wu, Samuel Hammer
Summary: The C-14 levels in methane and carbon dioxide were observed in an urban area (London) using a newly developed sampling system. The observed values surpassed the simulated values, indicating higher fossil fuel proportions and atmospheric concentrations. The correlation between observed and simulated net biospheric uptake was poor in June-July.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Review
Chemistry, Physical
Ahmad Salam Farooqi, Mohammad Yusuf, Noor Asmawati Mohd Zabidi, R. Saidur, Khairuddin Sanaullah, Abid Salam Farooqi, Afrasyab Khan, Bawadi Abdullah
Summary: Rapid global energy demand growth has led to increased greenhouse gas emissions, highlighting the importance of utilizing Ni-based catalysts for methane reforming as a sustainable solution. Ni-based catalysts offer cost-effectiveness and high catalytic activity in curbing emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Environmental Sciences
Christian Baresel, Jingjing Yang, Niclas Bornold, Kare Tjus, Linda Kanders, Klara Westling
Summary: The study found that MBR treating municipal wastewater produced small amounts of N2O and CH4 emissions, with relatively low N2O emission values. CH4 emissions accounted for 0.026%-0.12% of the incoming organic load, while N2O emissions amounted to 0.004%-0.07% of the total ammonium load. Additionally, the research indicated that excessive aeration at the beginning of the treatment line could lead to significantly increased emissions of N2O and CH4.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2022)
Article
Environmental Sciences
Andrea Fuchs, Peter Casper, Jorg Lewandowski
Summary: This study found that significant amounts of greenhouse gases, particularly methane, can be stored within the monimolimnion of meromictic lakes. The concentrations of methane in the monimolimnion were among the highest ever reported for a natural freshwater lake. The study also showed emissions of greenhouse gases from the thermocline to the atmosphere. These findings highlight the potential importance of lakes in natural brine areas in the storage and release of greenhouse gases.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(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.
