Article
Environmental Sciences
Bojan Durin, Lucija Plantak, Ognjen Bonacci, Fabio Di Nunno
Summary: Forecasting upstream flow based on downstream flow values is a new approach to manage flood risk. This methodology includes correlation, cross-correlation, and a rescaled adjusted partial sums (RAPS) method. High correlations were observed between the five hydrological stations along the Bednja River, indicating the potential to predict flow intensity.
Article
Environmental Sciences
Jeongwoo Hwang, Hemant Kumar, Albert Ruhi, Arumugam Sankarasubramanian, Naresh Devineni
Summary: Dams have a significant impact on the frequencies of natural streamflow in highly regulated river networks, leading to changes in river flow regimes with varying trends along different sections of the river.
WATER RESOURCES RESEARCH
(2021)
Article
Engineering, Environmental
J. Garcia-Hernandez, G. Leyva-Garcia, D. Aguilera-Marquez, R. E. Diaz-Argumedo, E. Santiago-Serrano, F. Zamora-Arroyo
Summary: This study investigated the electrical conductivity, dissolved oxygen, and ammonia-nitrogen concentrations in different locations of the Colorado River Delta during wet and dry periods. It found an increasing trend in salinity at certain locations, but the values did not exceed the limits for plant growth. Additionally, significant decreases in electrical conductivity were observed at some locations over the past 13 years, attributed to inflows from a water treatment plant and wetland. The results suggest that treated water can sustain and restore riparian corridors and wetlands.
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
(2022)
Article
Environmental Sciences
Ellen Wohl, Richard L. Knox
Summary: The lack of watershed-scale estimates of floodplain carbon stocks limits recognition of the important role of floodplains and river corridor restoration in efforts to enhance carbon sequestration. This study uses the South Platte River watershed in Colorado, USA as a case study and spatially explicit data to illustrate the spatial patterns of floodplain carbon stocks and prioritize floodplain restoration for carbon sequestration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Zhongyin Wei, Jiaming Li, Ziyi Wang, Anqi Zhou, Muhan Li
Summary: This study explores the spatial layout and dynamic evolution characteristics of county-level carbon emissions in the Yangtze River Delta region, identifies the influencing factors of carbon emissions, and evaluates their spatial spillover effects. The results show that county-level carbon emissions in this region are more complex and diverse compared to provinces and cities. The high carbon areas are concentrated in Shanghai, neighboring cities, and industrial counties under the jurisdiction of sub-core cities. Factors such as economic of scale, industrial structure, population size, technological advance, and environmental quality all have different effects on carbon emissions. The study suggests that precise carbon reduction should be implemented at the city-county level, and differentiated and coordinated carbon reduction policies should be adopted by the government.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Biodiversity Conservation
Qiang Liu, Zili Fang, Zhen Shi, Jing Li, Zhihan Rao
Summary: The study indicates that water diversion significantly affects the hydrochemistry of groundwater, with some sites receiving up to 90% of river discharge. Analysis reveals that multiple elements in surface water are closely related, while the source of elements in groundwater is related to hydrochemical compositions and the origin of surface water.
HUMAN AND ECOLOGICAL RISK ASSESSMENT
(2021)
Article
Engineering, Mechanical
Fanli Liu, Moran Wang
Summary: The study found that for fixed wettability, the critical pressure for mobilizing trapped ganglia usually peaks at neutrally wet conditions, and the movement of ganglia during the displacement process favors water-wet conditions. Moreover, altering wettability from oil-wet to water-wet requires a dynamic process with heterogeneous wetting states and the ability for ganglia to merge within a time window for further displacement.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Multidisciplinary Sciences
Hoang Tran, Jun Zhang, Mary Michael O'Neill, Anna Ryken, Laura E. Condon, Reed M. Maxwell
Summary: This article presents a hydrological reconstruction of the Upper Colorado River Basin using hourly temporal resolution and 1-km spatial resolution from October 1982 to September 2019. The validated dataset includes various hydrologic variables such as streamflow, water table depth, snow water equivalent (SWE), and evapotranspiration (ET). These datasets provide a long-term simulation of natural flow for one of the most over-allocated basins in the world.
Article
Environmental Sciences
Tiangui Lv, Han Hu, Xinmin Zhang, Hualin Xie, Li Wang, Shufei Fu
Summary: This paper investigates the relationship between urbanization and carbon emissions in the Yangtze River Delta urban agglomeration. The study finds that carbon emissions in the region are increasing, but at a slower rate. Economic factors have the most significant impact on carbon emissions. It is recommended to consider spatial spillover effects, determine optimal population size thresholds, promote low-carbon lifestyles, and encourage clean technology.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
M. Kifayath Chowdhury, Kory M. Konsoer, Matthew Hiatt
Summary: Spatial and temporal patterns in three-dimensional flow structure are influenced by both channelized and unchannelized lateral outflows in river deltas. This study analyzed the flow structure data collected from Wax Lake Delta and found that coherent secondary circulation cells were observed in channelized outflows, while minimal coherent structures were observed in unchannelized lateral outflows. The research suggests that the formation of detectable secondary circulation cells may depend on a threshold value of the ratio of lateral momentum flux to primary flow momentum flux.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
D. R. Feldman, M. Worden, N. Falco, P. J. Dennedy-Frank, J. Chen, B. Dafflon, H. Wainwright
Summary: In complex terrain, non-parallel surfaces receive radiation from adjacent surfaces, which affects the overall longwave radiative effect. By using observed land-surface temperatures, we calculate the three-dimensional longwave radiative effect over the Upper Colorado River Basin. The results show that this effect has significant implications, especially in the eastern and southeastern parts of the basin, for mountainous ecohydrology simulations.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Jingxin Xu, Sheng Wang, Borui Mai, Youfei Zheng, Shuang Qiu, Wenxin Tian, Hanqing Kang, Xi Zhang, Jinhui Gao
Summary: Regional simulation of ozone dry deposition is important for understanding ozone pollution threats and quantifying its impact on terrestrial ecosystems. This study evaluates ozone dry deposition in the Yangtze River Delta using two different schemes and compares the results with observations. The simulated ozone concentrations were lower than measurements, and the Surfatm scheme showed better agreement with observations. The mean ozone concentrations and dry deposition velocities in the region ranged from 30 to 50 nL L-1 and from 0.2 to 0.5 cm s-1 during daytime, respectively. Improving the simulation results requires considering land use types, parameter revisions, meteorological factors, and chemical reactions.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Thermodynamics
Changhua Chen, Yuqing Luo, Hong Zou, Junbing Huang
Summary: Technological progress is an effective tool for reducing carbon emissions, but its connection to carbon emissions is not well-researched in the literature. To address this gap, this study develops a new theoretical model based on the Green Solow model and analyzes the driving factors of carbon emissions in the Yangtze River Delta region using dynamic panel models. The results indicate that overall technological progress is beneficial for reducing carbon emissions. Energy substitution and energy conservation technologies have a positive effect on carbon emissions reduction, while production technology has a significant impact on driving carbon emissions.
Article
Environmental Sciences
Bin Zhao, Peng Yao, Dong Li, Zhigang Yu
Summary: River damming and the construction of the Three Gorges Dam have significantly impacted the distribution and burial of organic carbon in the coastal areas of the Changjiang River Delta, leading to reductions and redistribution of organic carbon. As global climate change and human activities continue to affect these processes, further research and consideration of these carbon burial hotspots in global carbon models is necessary.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Benjamin Bass, Naomi Goldenson, Stefan Rahimi, Alex Hall
Summary: The Colorado River Basin, a vital natural resource for the semi-arid southwestern United States, has experienced a decrease in runoff due to anthropogenic warming and CO2 increase. The reduction in runoff is approximately 8.1% per degree Celsius of warming, but decreases to 6.8% when considering vegetation response to CO2. Present-day conditions show a 10.3% reduction in runoff due to human-induced temperature and CO2 increase. Snowpack regions in the basin have been disproportionately affected, experiencing double the rate of runoff decline compared to non-snowpack regions.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Sarah Ellen Johnston, Kerri Finlay, Robert G. M. Spencer, David E. Butman, Mackenzie Metz, Robert Striegl, Matthew J. Bogard
Summary: Zooplankton communities release chemically complex dissolved organic matter (DOM) with significant ecological and biogeochemical contributions to aquatic ecosystems, but this source is often overlooked. This study reveals the composition of zooplankton-derived DOM inputs, highlighting the rich chemical diversity of linkages between animals and lower trophic levels.
Article
Geochemistry & Geophysics
H. Paul Johnson, Susan G. Merle, Tor A. Bjorklund, Susan L. Hautala, Tamara Baumberger, Sharon L. Walker, Junzhe Liu, Nicholas D. Ward, Chenyu Wang
Summary: Methane gas plumes have been found in the seafloor of the Puget Sound estuary, associated with major fault zones. Acoustic data confirmed the presence of 349 individual bubble plumes. Analysis of samples suggests a deep fluid source for the methane gas. However, these emission sites lack thermal and chemical anomalies seen in similar environments.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Environmental Sciences
Ian J. W. Giesbrecht, Suzanne E. Tank, Gordon W. Frazer, Eran Hood, Santiago G. Gonzalez Arriola, David E. Butman, David D'Amore, David Hutchinson, Allison Bidlack, Ken P. Lertzman
Summary: In this study, a hydro-biogeochemical classification system was developed for watersheds draining to the coastal margin of the Northeast Pacific coastal temperate rainforest. Cluster analysis was used to group watersheds into 12 types based on watershed properties, and the classification was validated using streamflow and dissolved organic carbon measurements from rivers. The results showed that watershed types corresponded with differences in streamflow regime, mean annual runoff, DOC seasonality, and mean DOC concentration.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Environmental Sciences
Joshua C. Koch, Matthew J. Bogard, David E. Butman, Kerri Finlay, Brian Ebel, Jason James, Sarah Ellen Johnston, M. Torre Jorgenson, Neal J. Pastick, Robert G. M. Spencer, Robert Striegl, Michelle Walvoord, Kimberly P. Wickland
Summary: Climate change is causing the thawing of permafrost soils in northern circumpolar landscapes, potentially releasing large quantities of organic carbon (OC) into the environment. However, the extent and mechanisms of OC mobilization and terrestrial-aquatic transfer are not well understood.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Plant Sciences
Weibin Li, Nate G. McDowell, Hongxia Zhang, Wenzhi Wang, D. Scott Mackay, Riley Leff, Peipei Zhang, Nicholas D. Ward, Matt Norwood, Steve Yabusaki, Allison N. Myers-Pigg, Stephanie C. Pennington, Alexandria L. Pivovaroff, Scott Waichler, Chonggang Xu, Ben Bond-Lamberty, Vanessa L. Bailey
Summary: Increasing seawater exposure is causing death of coastal trees globally. The impact of changing atmospheric CO2 concentration, temperature, and vapor pressure deficit on seawater-induced tree mortality is uncertain. This study found that hydraulic failure is the main cause of seawater-induced mortality, while changing CO2 and climate have little influence on coastal tree mortality.
Review
Biodiversity Conservation
Nate G. McDowell, Marilyn Ball, Ben Bond-Lamberty, Matthew L. Kirwan, Ken W. Krauss, J. Patrick Megonigal, Maurizio Mencuccini, Nicholas D. Ward, Michael N. Weintraub, Vanessa Bailey
Summary: Observations of woody plant mortality in coastal ecosystems are common worldwide, but the processes and mechanisms underlying these deaths are not well understood. This lack of knowledge, combined with changing water levels and climatic factors, creates uncertainty in predicting how coastal ecosystems will respond to global change. This study synthesizes existing research to propose a hypothesis framework for understanding the mechanisms driving coastal woody plant mortality.
GLOBAL CHANGE BIOLOGY
(2022)
Editorial Material
Pediatrics
Hector M. Zelaya, Dyana Picache, Nicholas D. Ward, Zengmin Yan, Chana L. Glasser
CLINICAL PEDIATRICS
(2023)
Article
Multidisciplinary Sciences
Joan P. Casas-Ruiz, Pascal Bodmer, Kelly Ann Bona, David Butman, Mathilde Couturier, Erik J. S. Emilson, Kerri Finlay, Helene Genet, Daniel Hayes, Jan Karlsson, David Pare, Changhui Peng, Rob Striegl, Jackie Webb, Xinyuan Wei, Susan E. Ziegler, Paul A. del Giorgio
Summary: This Perspective presents an integrative framework to improve estimates of land-atmosphere carbon exchange by considering the accumulation of carbon in the landscape and its export through rivers. The framework uses the watershed as the fundamental spatial unit and integrates all terrestrial and aquatic ecosystems. The application of this framework can bridge the gap between land and atmosphere-based approaches and enhance communication and collaboration among research communities.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Judith A. Rosentreter, Goulven G. Laruelle, Hermann W. Bange, Thomas S. Bianchi, Julius J. M. Busecke, Wei-Jun Cai, Bradley D. Eyre, Inke Forbrich, Eun Young Kwon, Taylor Maavara, Nils Moosdorf, Raymond G. Najjar, V. V. S. S. Sarma, Bryce Van Dam, Pierre Regnier
Summary: This article analyzes data from 738 observation sites and finds that coastal ecosystems have a certain absorption effect on greenhouse gases in the atmosphere, but methane and nitrous oxide emissions counteract the absorption of carbon dioxide. Southeast Asia, North America, and Africa are identified as hotspots for coastal greenhouse gas absorption.
NATURE CLIMATE CHANGE
(2023)
Article
Environmental Sciences
Vania Neu, Maria G. da S. G. Araujo, Victor M. Guedes, Nicholas D. Ward, Maridalva M. Ribeiro, Jeffrey E. Richey, Alex V. Krusche
Summary: This study evaluates the composition and abundance of carbon, nitrogen, and suspended sediment in the lower reaches of the Tocantins River. The results show that dissolved organic carbon and inorganic carbon concentrations increase during periods of high discharge. The Tocantins River contributes 3% and 3.7% to the total fluxes of dissolved carbon and nitrogen to the Amazon River plume region, respectively.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
G. McNicol, E. Hood, D. E. Butman, S. E. Tank, I. J. W. Giesbrecht, W. Floyd, D. D'Amore, J. B. Fellman, A. Cebulski, A. Lally, H. McSorley, S. G. Gonzalez Arriola
Summary: The rivers in the northeast Pacific Coastal Temperate Rainforest export 3.5 Tg-C yr(-1) of dissolved organic carbon (DOC) to the ocean. Over 56% of this DOC flux comes from small coastal watersheds, which make up only 22% of the total drainage basin. The average DOC yield from these coastal watersheds is roughly three times higher than that from tropical regions worldwide. These findings suggest that the export of DOC from these watersheds plays a significant role in regional-scale heterotrophy within near-shore marine ecosystems in the northeast Pacific.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Plant Sciences
Junyan Ding, Nate McDowell, Yilin Fang, Nicholas Ward, Matthew L. Kirwan, Peter Regier, Patrick Megonigal, Peipei Zhang, Hongxia Zhang, Wenzhi Wang, Weibin Li, Stephanie C. Pennington, Stephanie J. Wilson, Alice Stearns, Vanessa Bailey
Summary: Relative sea level rise is causing the formation of ghost forests, leading to impacts on coastal ecosystems. By incorporating physiological effects of salinity and hypoxia into a vegetation model, researchers have explored the mechanisms of conifer tree mortality on the east and west coasts of the USA. Different patterns of mortality were observed, with carbon starvation dominating on the east coast and hydraulic failure dominating on the west coast due to different forms of seawater exposure.
Article
Ecology
Kendalynn A. Morris, Ben P. Bond-Lamberty, Donnie J. Day, Kaizad F. Patel, Stephanie C. Pennington, Nicholas D. Ward, Joseph C. von Fischer
Summary: In this paper, a user-friendly R package is introduced to facilitate the broader implementation of isotopic pool dilution methods. This package provides extensive documentation and example analyses, and can be easily integrated into analytical pipelines.
METHODS IN ECOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Hannah D. Conroy, Erin R. Hotchkiss, Kaelin M. Cawley, Keli Goodman, Robert O. Hall Jr, Jeremy B. Jones, Wilfred M. Wollheim, David Butman
Summary: Headwater stream networks contribute significantly to the terrestrial carbon dioxide flux due to turbulence and interaction with terrestrial environments. Measuring and scaling these emissions is challenging due to limited monitoring points. Our study found that the stream network had higher carbon emissions under high flow conditions compared to low flow conditions. Winter stream emissions accounted for a larger percentage of the forest net ecosystem exchange than in summer, highlighting the importance of considering flow regime in annual estimates of stream network emissions.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Elise S. Morrison, Yina Liu, Albert Rivas-Ubach, Joao Henrique Fernandes Amaral, Michael Shields, Todd Z. Osborne, Rosalie Chu, Nicholas Ward, Thomas S. Bianchi
Summary: As sea levels rise, the export of blue carbon to offshore areas may result in increased carbon dioxide production. Lab incubation experiments suggest that priming coastal seawater with leachate from mangrove peat promotes microbial biomass production without significantly impacting carbon dioxide production.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)