Advancing Watershed Legacy Nitrogen Modeling to Improve Global Water Quality

Article Geosciences, Multidisciplinary

Managing nitrogen legacies to accelerate water quality improvement

Nandita B. Basu et al.

Summary: Agricultural nitrogen legacies are causing delays in improving water quality, highlighting the need for comprehensive management strategies to address these issues and ensure better environmental outcomes.

NATURE GEOSCIENCE (2022)

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Article Environmental Sciences

Characterizing Catchment-Scale Nitrogen Legacies and Constraining Their Uncertainties

Fanny J. Sarrazin et al.

Summary: Improving the nitrogen status in European water bodies is an urgent issue, and it is not only dependent on current nitrogen inputs but also on past accumulations. Catchment-scale nitrogen models rarely consider the magnitude and dynamics of legacy components. This study aims to investigate the long-term fate of nitrogen inputs and its uncertainties using a legacy-driven nitrogen model in Germany's largest river basin.

WATER RESOURCES RESEARCH (2022)

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Article Engineering, Environmental

Confronting our Agricultural Nonpoint Source Control Policy Problem

Kurt Stephenson et al.

Summary: Federal and state agricultural and environmental agencies have invested significant funds since the 1990s to reduce nonpoint source water pollution from agriculture. However, water quality problems still persist, and the lack of progress can be attributed to shortcomings in agricultural NPS pollution control policy.

JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION (2022)

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Editorial Material Water Resources

Pulling the rabbit out of the hat: Unravelling hidden nitrogen legacies in catchment-scale water quality models

Stefanie R. Lutz et al.

HYDROLOGICAL PROCESSES (2022)

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Article Environmental Sciences

Influences of the landscape pattern on riverine nitrogen exports derived from legacy sources in subtropical agricultural catchments

Cen Meng et al.

Summary: The study found that changes in landscape patterns can significantly influence legacy nitrogen release, especially in agricultural and residential areas where highly aggregated and simple-shaped patches increase the release of legacy nitrogen.

BIOGEOCHEMISTRY (2021)

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Article Environmental Sciences

The land use legacy effect: looking back to see a path forward to improve management

Sherry L. Martin et al.

Summary: This study reveals the slow delivery process of nitrogen in groundwater over time, indicating that actions taken now may not show expected results for decades or even centuries. Differences in groundwater travel times create a heterogeneous patchwork, allowing managers to prioritize actions to best match their targeted response times. Agricultural practices are the main source of nitrogen contributions, but human contributions also play a role.

ENVIRONMENTAL RESEARCH LETTERS (2021)

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Article Environmental Sciences

A hillslope-scale aquifer-model to determine past agricultural legacy and future nitrate concentrations in rivers

Luca Guillaumot et al.

Summary: The fate of agricultural nitrate in aquifers is influenced by rapid subsurface transfer, denitrification processes, and storage. Quantifying these processes remains challenging due to variable subsurface contributions and unknown aquifer characteristics. The study suggests that nitrate concentration in rivers is determined by aquifer flows stratification, with denitrification potentially controlled by the accessibility of reduced minerals and weathering interfaces.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

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Article Green & Sustainable Science & Technology

Remediating Agricultural Legacy Nutrient Loads in the Baltic Sea Region

Julia Tanzer et al.

Summary: The Baltic Sea is heavily affected by eutrophication, and the costs for remediating legacy nutrient loads are still unclear. Preliminary estimates suggest that addressing these nutrients would require billions to over a hundred billion euros, but it is not infeasible and may even bring economic benefits in the long run.

SUSTAINABILITY (2021)

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Article Environmental Sciences

Chesapeake legacies: the importance of legacy nitrogen to improving Chesapeake Bay water quality

S. Y. Chang et al.

Summary: Efforts to reduce nitrogen inputs in the Chesapeake Bay have shown some progress, with recent improvements in water quality attributed to decreases in nitrogen surplus magnitudes. Despite slow improvement, goals to reduce nitrogen loads by 25% across the region may be met within the next two decades even with no additional changes in current management practices. Time lags in achieving water quality goals may vary across different watersheds, with the longest delays seen in highly agricultural areas where legacy nitrogen continues to impact water quality.

ENVIRONMENTAL RESEARCH LETTERS (2021)

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Article Environmental Sciences

Checkered landscapes: hydrologic and biogeochemical nitrogen legacies along the river continuum

J. Liu et al.

Summary: The study found significant legacy nitrogen accumulation in the Grand River Watershed, with the majority stored in soil organic nitrogen reservoirs and the rest in groundwater. Water quality improvement timescales varied across watersheds, with larger legacies contributing to slower recovery.

ENVIRONMENTAL RESEARCH LETTERS (2021)

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Article Environmental Sciences

The need to integrate legacy nitrogen storage dynamics and time lags into policy and practice

Matthew J. Ascott et al.

Summary: The use of nitrogen fertilizers leads to increased fluxes of reactive nitrogen, causing negative environmental consequences such as eutrophication. Despite the introduction of best management practices to reduce N-r loading, improvements in water quality have not always been realized over expected timescales. Integrating legacy N-r storage dynamics and time lags into policy frameworks is crucial for more realistic expectations and better meeting the needs of human and environmental health.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

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Article Geosciences, Multidisciplinary

Time lags of nitrate, chloride, and tritium in streams assessed by dynamic groundwater flow tracking in a lowland landscape

Vince P. Kaandorp et al.

Summary: This study investigated the impact of agricultural activities on surface waters through calculating the long-term concentrations of tritium, chloride, and nitrate in streams. It found a time lag between peak nitrogen input and subsequent trend reversal of nitrate in groundwater-fed streams, highlighting the complex dynamics of groundwater flow paths and attenuation processes that influence water quality. By linking dynamic groundwater travel time distributions with in-stream concentration measurements, a method for validating the travel time approach in water quality modeling and management was provided.

HYDROLOGY AND EARTH SYSTEM SCIENCES (2021)

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Article Ecology

Seasonal Disconnect Between Streamflow and Retention Shapes Riverine Nitrogen Export in the Willamette River Basin, Oregon

Jana E. Compton et al.

ECOSYSTEMS (2020)

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Article Environmental Sciences

Surface Depression and Wetland Water Storage Improves Major River Basin Hydrologic Predictions

Adnan Rajib et al.

WATER RESOURCES RESEARCH (2020)

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Review Engineering, Environmental

Best Management Practices for Diffuse Nutrient Pollution: Wicked Problems Across Urban and Agricultural Watersheds

Anna Lintern et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

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Article Engineering, Environmental

Stream Nitrogen and Phosphorus Loads Are Differentially Affected by Storm Events and the Difference May Be Exacerbated by Conservation Tillage

Patrick T. Kelly et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2019)

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Article Environmental Sciences

A Race Against Time: Modeling Time Lags in Watershed Response

Idhayachandhiran Ilampooranan et al.

WATER RESOURCES RESEARCH (2019)

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Article Environmental Sciences

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

Wayne A. Wurtsbaugh et al.

WILEY INTERDISCIPLINARY REVIEWS-WATER (2019)

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Article Environmental Sciences

Hydrologic Extremes and Legacy Sources Can Override Efforts to Mitigate Nutrient and Sediment Losses at the Catchment Scale

Magdalena Bieroza et al.

JOURNAL OF ENVIRONMENTAL QUALITY (2019)

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Article Multidisciplinary Sciences

Legacy nitrogen may prevent achievement of water quality goals in the Gulf of Mexico

K. J. Van Meter et al.

SCIENCE (2018)

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Article Environmental Sciences

Before the storm: antecedent conditions as regulators of hydrologic and biogeochemical response to extreme climate events

Sara K. McMillan et al.

BIOGEOCHEMISTRY (2018)

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Review Computer Science, Interdisciplinary Applications

Embedding co-production and addressing uncertainty in watershed modeling decision-support tools: Successes and challenges

Bradley L. Barnhart et al.

ENVIRONMENTAL MODELLING & SOFTWARE (2018)

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Review Green & Sustainable Science & Technology

Addressing agricultural nitrogen losses in a changing climate

Timothy M. Bowles et al.

NATURE SUSTAINABILITY (2018)

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Review Ecology

Integrating geographically isolated wetlands into land management decisions

Heather E. Golden et al.

FRONTIERS IN ECOLOGY AND THE ENVIRONMENT (2017)

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Article Environmental Sciences

Two centuries of nitrogen dynamics: Legacy sources and sinks in the Mississippi and Susquehanna River Basins

K. J. Van Meter et al.

GLOBAL BIOGEOCHEMICAL CYCLES (2017)

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Article Environmental Sciences

A lagged variable model for characterizing temporally dynamic export of legacy anthropogenic nitrogen from watersheds to rivers

Dingjiang Chen et al.

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2015)

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Article Multidisciplinary Sciences

Catchment Legacies and Time Lags: A Parsimonious Watershed Model to Predict the Effects of Legacy Storage on Nitrogen Export

Kimberly J. Van Meter et al.

PLOS ONE (2015)

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Article Engineering, Environmental

Influence of Lag Effect, Soil Release, And Climate Change on Watershed Anthropogenic Nitrogen Inputs and Riverine Export Dynamics

Dingjiang Chen et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2014)

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Article Environmental Sciences

Decadal surface water quality trends under variable climate, land use, and hydrogeochemical setting in Iowa, USA

Christopher T. Green et al.

WATER RESOURCES RESEARCH (2014)

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Article Ecology

Capturing interactions between nitrogen and hydrological cycles under historical climate and land use: Susquehanna watershed analysis with the GFDL land model LM3-TAN

M. Lee et al.

BIOGEOSCIENCES (2014)

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Article Engineering, Environmental

Quantifying Groundwater's Role in Delaying Improvements to Chesapeake Bay Water Quality

Ward E. Sanford et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2013)

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Article Multidisciplinary Sciences

Long-term fate of nitrate fertilizer in agricultural soils

Mathieu Sebilo et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2013)

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Article Environmental Sciences

Nutrient export from catchments on forested landscapes reveals complex nonstationary and stationary climate signals

Samson G. Mengistu et al.

WATER RESOURCES RESEARCH (2013)

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Article Water Resources

Prediction of the arrival of peak nitrate concentrations at the water table at the regional scale in Great Britain

L. Wang et al.

HYDROLOGICAL PROCESSES (2012)

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Article Engineering, Environmental

Nitrogen Contamination of Surficial Aquifers-A Growing Legacy

Larry J. Puckett et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2011)

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Article Geosciences, Multidisciplinary

Nutrient loads exported from managed catchments reveal emergent biogeochemical stationarity

Nandita B. Basu et al.

GEOPHYSICAL RESEARCH LETTERS (2010)

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Editorial Material Environmental Sciences

HELCOM Baltic Sea Action Plan - A regional programme of measures for the marine environment based on the Ecosystem Approach

Hermanni Backer et al.

MARINE POLLUTION BULLETIN (2010)

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Review Environmental Sciences

Lag Time in Water Quality Response to Best Management Practices: A Review

Donald W. Meals et al.

JOURNAL OF ENVIRONMENTAL QUALITY (2010)

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Review Multidisciplinary Sciences

Spreading dead zones and consequences for marine ecosystems

Robert J. Diaz et al.

SCIENCE (2008)

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Advancing Watershed Legacy Nitrogen Modeling to Improve Global Water Quality

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