Gregory E Schwarz (Former Employee)
Science and Products
Filter Total Items: 68
A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models
Stream-loading information was compiled from federal, state, and local agencies, and selected universities as part of an effort to develop regional SPAtially Referenced Regressions On Watershed attributes (SPARROW) models to help describe the distribution, sources, and transport of nutrients in streams throughout much of the United States. After screening, 2,739 sites, sampled by 73...
Authors
David A. Saad, Gregory E. Schwarz, Dale M. Robertson, Nathaniel Booth
The Regionalization of National-Scale SPARROW Models for Stream Nutrients The Regionalization of National-Scale SPARROW Models for Stream Nutrients
This analysis modifies the parsimonious specification of recently published total nitrogen (TN) and total phosphorus (TP) national‐scale SPAtially Referenced Regressions On Watershed attributes models to allow each model coefficient to vary geographically among three major river basins of the conterminous United States. Regionalization of the national models reduces the standard errors...
Authors
Gregory E. Schwarz, Richard B. Alexander, Richard A. Smith, Stephen D. Preston
Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the continental United States Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the continental United States
We compared the results of 12 recently calibrated regional SPARROW (SPAtially Referenced Regressions On Watershed attributes) models covering most of the continental United States to evaluate the consistency and regional differences in factors affecting stream nutrient loads. The models – 6 for total nitrogen and 6 for total phosphorus – all provide similar levels of prediction accuracy...
Authors
Stephen D. Preston, Richard B. Alexander, Gregory E. Schwarz, Charles G. Crawford
The regionalization of national-scale SPARROW models for stream nutrients The regionalization of national-scale SPARROW models for stream nutrients
This analysis modifies the parsimonious specification of recently published total nitrogen (TN) and total phosphorus (TP) national-scale SPAtially Referenced Regressions On Watershed attributes models to allow each model coefficient to vary geographically among three major river basins of the conterminous United States. Regionalization of the national models reduces the standard errors...
Authors
Gregory E. Schwarz, Richard B. Alexander, Richard A. Smith, Stephen D. Preston
A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models
Stream‐loading information was compiled from federal, state, and local agencies, and selected universities as part of an effort to develop regional SPAtially Referenced Regressions On Watershed attributes (SPARROW) models to help describe the distribution, sources, and transport of nutrients in streams throughout much of the United States. After screening, 2,739 sites, sampled by 73...
Authors
D. A. Saad, G. E. Schwarz, Dale M. Robertson, N.L. Booth
Sources of suspended-sediment flux in streams of the chesapeake bay watershed: A regional application of the sparrow model Sources of suspended-sediment flux in streams of the chesapeake bay watershed: A regional application of the sparrow model
We describe the sources and transport of fluvial suspended sediment in nontidal streams of the Chesapeake Bay watershed and vicinity. We applied SPAtially Referenced Regressions on Watershed attributes, which spatially correlates estimated mean annual flux of suspended sediment in nontidal streams with sources of suspended sediment and transport factors. According to our model, urban...
Authors
J. W. Brakebill, S.W. Ator, G. E. Schwarz
Science and Products
Filter Total Items: 68
A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models
Stream-loading information was compiled from federal, state, and local agencies, and selected universities as part of an effort to develop regional SPAtially Referenced Regressions On Watershed attributes (SPARROW) models to help describe the distribution, sources, and transport of nutrients in streams throughout much of the United States. After screening, 2,739 sites, sampled by 73...
Authors
David A. Saad, Gregory E. Schwarz, Dale M. Robertson, Nathaniel Booth
The Regionalization of National-Scale SPARROW Models for Stream Nutrients The Regionalization of National-Scale SPARROW Models for Stream Nutrients
This analysis modifies the parsimonious specification of recently published total nitrogen (TN) and total phosphorus (TP) national‐scale SPAtially Referenced Regressions On Watershed attributes models to allow each model coefficient to vary geographically among three major river basins of the conterminous United States. Regionalization of the national models reduces the standard errors...
Authors
Gregory E. Schwarz, Richard B. Alexander, Richard A. Smith, Stephen D. Preston
Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the continental United States Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the continental United States
We compared the results of 12 recently calibrated regional SPARROW (SPAtially Referenced Regressions On Watershed attributes) models covering most of the continental United States to evaluate the consistency and regional differences in factors affecting stream nutrient loads. The models – 6 for total nitrogen and 6 for total phosphorus – all provide similar levels of prediction accuracy...
Authors
Stephen D. Preston, Richard B. Alexander, Gregory E. Schwarz, Charles G. Crawford
The regionalization of national-scale SPARROW models for stream nutrients The regionalization of national-scale SPARROW models for stream nutrients
This analysis modifies the parsimonious specification of recently published total nitrogen (TN) and total phosphorus (TP) national-scale SPAtially Referenced Regressions On Watershed attributes models to allow each model coefficient to vary geographically among three major river basins of the conterminous United States. Regionalization of the national models reduces the standard errors...
Authors
Gregory E. Schwarz, Richard B. Alexander, Richard A. Smith, Stephen D. Preston
A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models
Stream‐loading information was compiled from federal, state, and local agencies, and selected universities as part of an effort to develop regional SPAtially Referenced Regressions On Watershed attributes (SPARROW) models to help describe the distribution, sources, and transport of nutrients in streams throughout much of the United States. After screening, 2,739 sites, sampled by 73...
Authors
D. A. Saad, G. E. Schwarz, Dale M. Robertson, N.L. Booth
Sources of suspended-sediment flux in streams of the chesapeake bay watershed: A regional application of the sparrow model Sources of suspended-sediment flux in streams of the chesapeake bay watershed: A regional application of the sparrow model
We describe the sources and transport of fluvial suspended sediment in nontidal streams of the Chesapeake Bay watershed and vicinity. We applied SPAtially Referenced Regressions on Watershed attributes, which spatially correlates estimated mean annual flux of suspended sediment in nontidal streams with sources of suspended sediment and transport factors. According to our model, urban...
Authors
J. W. Brakebill, S.W. Ator, G. E. Schwarz