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Articles 1 - 12 of 12
Full-Text Articles in Engineering
Estimation Of Solute Fluxes From Ungaged Headwater Catchments In The Catskill Park Of New York State, Chris Gianfagna
Estimation Of Solute Fluxes From Ungaged Headwater Catchments In The Catskill Park Of New York State, Chris Gianfagna
Civil and Environmental Engineering - Theses
Predictions of flow and subsequent solute fluxes from ungaged basins have important implications both for water resources management and ecosystem monitoring studies. The Catskill region of New York State is one such place that requires both water resources management and ecosystem monitoring due to its strategic location as the main water-supplying region for New York City. This study examines the differences in chemical mass flux estimates made in ungaged basins using three different chemistry aggregation methods for solute concentrations determined from monthly grab samples. The efficacy of area ratios for predicting flow at the upstream location of a nested pair …
Spatial Patterns Of Mercury In Atmospheric Deposition, Soils And Lake Biota In The Adirondack Park, New York, Xue Yu
Civil and Environmental Engineering - Dissertations
Mercury (Hg), as a trace element cycling in the environment, poses a serious health threat to both humans and wildlife due to its toxicity. Atmospheric deposition is the main source of Hg to most remote environments. The Adirondack Park in New York State of the United States receives moderate Hg deposition, and is a region characterized by relatively high concentrations of Hg in the terrestrial and especially aquatic biota. It is important to understand the mechanisms that contribute to the sensitivity of this region to Hg inputs. In my research, studies of the spatial patterns of Hg in atmospheric deposition, …
Long-Term Integrated Studies Show Complex And Surprising Effects Of Climate Change In The Northern Hardwood Forest, Peter M. Groffman, Charles T. Driscoll, Chris E. Johnson, Lindsey E. Rustad, Pamela H. Templer
Long-Term Integrated Studies Show Complex And Surprising Effects Of Climate Change In The Northern Hardwood Forest, Peter M. Groffman, Charles T. Driscoll, Chris E. Johnson, Lindsey E. Rustad, Pamela H. Templer
Civil and Environmental Engineering
Evaluations of the local effects of global change are often confounded by the interactions of natural and anthropogenic factors that overshadow the effects of climate changes on ecosystems. Long-term watershed and natural elevation gradient studies at the Hubbard Brook Experimental Forest and in the surrounding region show surprising results demonstrating the effects of climate change on hydrologic variables (e.g., evapotranspiration, streamflow, soil moisture); the importance of changes in phenology on water, carbon, and nitrogen fluxes during critical seasonal transition periods; winter climate change effects on plant and animal community composition and ecosystem services; and the effects of anthropogenic disturbances and …
Modeling Potential Hydrochemical Responses To Climate Change And Increasing Co2 At The Hubbard Brook Experimental Forest Using A Dynamic Biogeochemical Model (Pnet-Bgc), Afshin Pourmokhtaria, Charles T. Driscoll, John L. Campbell, Katharine Hayhoe
Modeling Potential Hydrochemical Responses To Climate Change And Increasing Co2 At The Hubbard Brook Experimental Forest Using A Dynamic Biogeochemical Model (Pnet-Bgc), Afshin Pourmokhtaria, Charles T. Driscoll, John L. Campbell, Katharine Hayhoe
Civil and Environmental Engineering
Dynamic hydrochemical models are useful tools for understanding and predicting the interactive effects of climate change, atmospheric CO2, and atmospheric deposition on the hydrology and water quality of forested watersheds. We used the biogeochemical model, PnET-BGC, to evaluate the effects of potential future changes in temperature, precipitation, solar radiation, and atmospheric CO2 on pools, concentrations, and fluxes of major elements at the Hubbard Brook Experimental Forest in New Hampshire, United States. Future climate projections used to run PnET-BGC were generated specifically for the Hubbard Brook Experimental Forest with a statistical technique that downscales climate output (e.g., air temperature, precipitation, solar …
Recovery Of Sensitive Watersheds In The Northeastern United States From Chronic Acidification: The Role Of Soil Chemistry, Chris E. Johnson
Recovery Of Sensitive Watersheds In The Northeastern United States From Chronic Acidification: The Role Of Soil Chemistry, Chris E. Johnson
Civil and Environmental Engineering
No abstract provided.
Science And Society: The Role Of Long-Term Studies In Environmental Stewardship, Charles T. Driscoll, Kathleen F. Lambert, F. Stuart Chapin, David J. Nowake, Thomas A. Spies, Frederick J. Swanson, David B. Kittredge, Clarisse M. Hart
Science And Society: The Role Of Long-Term Studies In Environmental Stewardship, Charles T. Driscoll, Kathleen F. Lambert, F. Stuart Chapin, David J. Nowake, Thomas A. Spies, Frederick J. Swanson, David B. Kittredge, Clarisse M. Hart
Civil and Environmental Engineering
Long-term research should play a crucial role in addressing grand challenges in environmental stewardship. We examine the efforts of five Long Term Ecological Research Network sites to enhance policy, management, and conservation decisions for forest ecosystems. In these case studies, we explore the approaches used to inform policy on atmospheric deposition, public land management, land conservation, and urban forestry, including decisionmaker engagement and integration of local knowledge, application of models to analyze the potential consequences of policy and management decisions, and adaptive management to generate new knowledge and incorporate it into decisionmaking. Efforts to enhance the role of long-term research …
Watershed-Level Responses To Calcium Silicate Treatment In A Northern Hardwood Forest, Youngil Cho, Charles T. Driscoll, Chris E. Johnson, Joel D. Blum, Timothy J. Fahey
Watershed-Level Responses To Calcium Silicate Treatment In A Northern Hardwood Forest, Youngil Cho, Charles T. Driscoll, Chris E. Johnson, Joel D. Blum, Timothy J. Fahey
Civil and Environmental Engineering
Watershed 1 (W1) at the Hubbard Brook Experimental Forest in New Hampshire, with chronically low pH and acid neutralizing capacity (ANC) in surface water, was experimentally treated with calcium silicate (CaSiO3; wollastonite) in October 1999 to assess the role of calcium (Ca) supply in the structure and function of base-poor forest ecosystems. Wollastonite addition significantly increased the concentrations and fluxes of Ca, dissolved silica (Si), and ANC and decreased the concentrations and fluxes of inorganic monomeric Al (Ali) and hydrogen ion (H+) in both soil solution and stream water in all sub-watersheds of W1. …
Marine Mercury Fate: From Sources To Seafood Consumers, Celia Y. Chen, Charles T. Driscoll, Kathy Lambert, Robert P. Mason, Laurie Rardin
Marine Mercury Fate: From Sources To Seafood Consumers, Celia Y. Chen, Charles T. Driscoll, Kathy Lambert, Robert P. Mason, Laurie Rardin
Civil and Environmental Engineering
No abstract provided.
A Synthesis Of Rates And Controls On Elemental Mercury Evasion In The Great Lakes Basin, Joseph S. Denkenberger, Charles T. Driscoll, Brian A. Branfireun, Chris S. Eckley, Mark Cohen, Pranesh Selvendiran
A Synthesis Of Rates And Controls On Elemental Mercury Evasion In The Great Lakes Basin, Joseph S. Denkenberger, Charles T. Driscoll, Brian A. Branfireun, Chris S. Eckley, Mark Cohen, Pranesh Selvendiran
Civil and Environmental Engineering
Rates of surface-air elemental mercury (Hgo) fluxes in the literature were synthesized for the Great Lakes Basin (GLB). For the majority of surfaces, fluxes were net positive (evasion). Digital land-cover data were combined with representative evasion rates and used to estimate annual Hgo evasion for the GLB (7.7 Mg/yr). This value is less than our estimate of total Hg deposition to the area (15.9 Mg/yr), suggesting the GLB is a net sink for atmospheric Hg. The greatest contributors to annual evasion for the basin are agricultural (~55%) and forest (~25%) land cover types, and the open water of the Great …
Nutrient Supply And Mercury Dynamics In Marine Ecosystems: A Conceptual Model, Charles T. Driscoll, Celia Y. Chen, Chad R. Hammerschmidt, Robert P. Mason, Cynthia C. Gilmour
Nutrient Supply And Mercury Dynamics In Marine Ecosystems: A Conceptual Model, Charles T. Driscoll, Celia Y. Chen, Chad R. Hammerschmidt, Robert P. Mason, Cynthia C. Gilmour
Civil and Environmental Engineering
There is increasing interest and concern over the impacts of mercury (Hg) inputs to marine 32 ecosystems. One of the challenges in assessing these effects is that the cycling and trophic 33 transfer of Hg are strongly linked to other contaminants and disturbances. In addition to Hg, a 34 major problem facing coastal waters is the impacts of elevated nutrient, particularly nitrogen 35 (N), inputs. Increases in nutrient loading alter coastal ecosystems in ways that should change 36 the transport, transformations and fate of Hg, including increases in fixation of organic carbon 37 and deposition to sediments, decreases in the …
Nutrient Supply And Mercury Dynamics In Marine Ecosystems: A Conceptual Model, Charles T. Driscoll, Celia Y. Chen, Chad R. Hammerschmidt, Robert P. Mason, Cynthia C. Gilmour, Elsie M. Sunderland, Ben K. Greenfield, Kate L. Buckman, Carl H. Lamborg
Nutrient Supply And Mercury Dynamics In Marine Ecosystems: A Conceptual Model, Charles T. Driscoll, Celia Y. Chen, Chad R. Hammerschmidt, Robert P. Mason, Cynthia C. Gilmour, Elsie M. Sunderland, Ben K. Greenfield, Kate L. Buckman, Carl H. Lamborg
Civil and Environmental Engineering
There is increasing interest and concern over the impacts of mercury (Hg) inputs to marine ecosystems. One of the challenges in assessing these effects is that the cycling and trophic transfer of Hg are strongly linked to other contaminants and disturbances. In addition to Hg, a major problem facing coastal waters is the impacts of elevated nutrient, particularly nitrogen (N), inputs. Increases in nutrient loading alter coastal ecosystems in ways that should change the transport, transformations and fate of Hg, including increases in fixation of organic carbon and deposition to sediments, decreases in the redox status of sediments and changes …
Shift Towards P Limitation With N Deposition?, K. F. Crowley, B. E. Mcneil, G. M. Lovett, C. D. Canham, C. T. Driscoll
Shift Towards P Limitation With N Deposition?, K. F. Crowley, B. E. Mcneil, G. M. Lovett, C. D. Canham, C. T. Driscoll
Civil and Environmental Engineering
Atmospheric nitrogen (N) deposition is altering biogeochemical cycling in forests and interconnected lakes of the northeastern US, and may shift nutrient limitation from N toward other essential elements, such as phosphorus (P). Whether this shift is occurring relative to N deposition gradients across the northeastern US has not been investigated. We used datasets for the northeastern US and the Adirondack sub-region to evaluate whether P limitation is increasing where N deposition is high at two geographic scales, based on N:P mass ratios. Using a model- selection approach, we determined that foliar N for dominant tree species and lake dissolved inorganic …