Evaluation of the Current State of Distributed Watershed Nutrient Water Quality Modeling

Environmental Science & Technology, Journal Year: 2015, Volume and Issue: 49(6), P. 3278 - 3290

Published: Feb. 18, 2015

Watershed models have been widely used for creating the scientific basis management decisions regarding nonpoint source pollution. In this study, we evaluated current state of watershed scale, spatially distributed, process-based, water quality modeling nutrient Beginning from 1992, year when Beven and Binley published their seminal paper on uncertainty analysis in hydrological modeling, ending 2010, selected 257 publications which (i) employed distributed approaches at a scale; (ii) provided predictions flow, nutrient/sediment concentrations or loads; (iii) reported fit to measured data. Most "best practices" (optimization, validation, sensitivity, analysis) are not consistently during model development. There no statistically significant differences performance among land uses. Studies more than one point space evaluate had significantly lower median values Nash-Sutcliffe Efficiency (0.70 vs 0.56, p<0.005, nonparametric Mann-Whitney test), r2 (p<0.005). This finding suggests that calibration only basin outlet may mask compensation positive negative errors transportation processes. We conclude by advocating number new directions including in-depth use additional information, necessarily related end points, constrain parameter estimation.

Language: Английский

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Lake microbial communities are resilient after a whole-ecosystem disturbance

The ISME Journal, Journal Year: 2012, Volume and Issue: 6(12), P. 2153 - 2167

Published: June 28, 2012

Abstract Disturbances act as powerful structuring forces on ecosystems. To ask whether environmental microbial communities have capacity to recover after a large disturbance event, we conducted whole-ecosystem manipulation, during which imposed an intense freshwater by artificially mixing temperate lake peak summer thermal stratification. We employed sensors and water chemistry analyses evaluate the physical chemical responses of lake, bar-coded 16S ribosomal RNA gene pyrosequencing automated intergenic spacer analysis (ARISA) assess bacterial community responses. The artificial increased mean temperature from 14 20 °C for seven weeks ended, exposed microorganisms very different conditions, including hypolimnion oxygen epilimnion carbon dioxide concentrations. Though overall ecosystem conditions remained altered (with temperatures elevated 6 °C), returned their pre-manipulation state some such concentration, recovered. Recovery pre-disturbance composition diversity was observed within 7 (epilimnion) 11 (hypolimnion) days mixing. Our results suggest that major disturbance.

Language: Английский

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Modelling eutrophication in lake ecosystems: A review

The Science of The Total Environment, Journal Year: 2018, Volume and Issue: 651, P. 2985 - 3001

Published: Sept. 26, 2018

Language: Английский

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Physical forcing and physical/biochemical variability of the Mediterranean Sea: a review of unresolved issues and directions for future research

Ocean science, Journal Year: 2014, Volume and Issue: 10(3), P. 281 - 322

Published: May 6, 2014

Abstract. This paper is the outcome of a workshop held in Rome November 2011 on occasion 25th anniversary POEM (Physical Oceanography Eastern Mediterranean) program. In discussions, number unresolved issues were identified for physical and biogeochemical properties Mediterranean Sea as whole, i.e., comprising Western sub-basins. Over successive two years, related ideas discussed among group scientists who participated have contributed to writing this paper. Three major topics identified, each them being object section divided into different sub-sections, addressing specific physical, chemical or biological issue: 1. Assessment basin-wide physical/biochemical properties, their variability interactions. 2. Relative importance external forcing functions (wind stress, heat/moisture fluxes, through straits) vs. internal variability. 3. Shelf/deep sea interactions exchanges physical/biogeochemical how they affect sub-basin circulation property distribution. Furthermore, scientific/methodological also are reported sub-section after short discussion present knowledge. They represent collegial consensus contributing Naturally, presented here constitute choice authors therefore may not be exhaustive and/or complete. The overall goal stimulate broader interdisciplinary oceanographic community, leading enhanced collaborative efforts exciting future discoveries.

Language: Английский

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Rethinking the Role of Salps in the Ocean

Trends in Ecology & Evolution, Journal Year: 2016, Volume and Issue: 31(9), P. 720 - 733

Published: July 18, 2016

Language: Английский

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Global Carbon Cycling on a Heterogeneous Seafloor

Trends in Ecology & Evolution, Journal Year: 2017, Volume and Issue: 33(2), P. 96 - 105

Published: Dec. 14, 2017

Diverse biological communities mediate the transformation, transport, and storage of elements fundamental to life on Earth, including carbon, nitrogen, oxygen. However, global biogeochemical model outcomes can vary by orders magnitude, compromising capacity project realistic ecosystem responses planetary changes, ocean productivity climate. Here, we compare carbon turnover rates estimated using models grounded in versus geochemical theory argue that estimates based each perspective yield divergent outcomes. Importantly, empirical studies include sedimentary activity less than those ignore it. Improving relevance projections reducing uncertainty associated with anticipated consequences change requires reconciliation these perspectives, enabling better societal decisions mitigation adaptation.

Language: Английский

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Short-term Lake Erie algal bloom prediction by classification and regression models

Water Research, Journal Year: 2023, Volume and Issue: 232, P. 119710 - 119710

Published: Feb. 5, 2023

Language: Английский

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Quantifying uncertainty in high-resolution coupled hydrodynamic-ecosystem models

Journal of Marine Systems, Journal Year: 2006, Volume and Issue: 64(1-4), P. 3 - 14

Published: July 8, 2006

Language: Английский

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Coupled Biological and Physical Models: Present Capabilities and Necessary Developments for Future Studies of Population Connectivity

Oceanography, Journal Year: 2007, Volume and Issue: 20(3), P. 54 - 69

Published: Sept. 1, 2007

Language: Английский

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Towards end-to-end models for investigating the effects of climate and fishing in marine ecosystems

Progress In Oceanography, Journal Year: 2007, Volume and Issue: 75(4), P. 751 - 770

Published: Aug. 10, 2007

Language: Английский

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