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Articles 91 - 100 of 100
Full-Text Articles in Oceanography and Atmospheric Sciences and Meteorology
Urban Sprawl As A Risk Factor In Motor Vehicle Crashes, Reid Ewing, Shima Hamidi, James B. Grace
Urban Sprawl As A Risk Factor In Motor Vehicle Crashes, Reid Ewing, Shima Hamidi, James B. Grace
United States Geological Survey: Staff Publications
A decade ago, compactness/sprawl indices were developed for metropolitan areas and counties which have been widely used in health and other research. In this study, we first update the original county index to 2010, then develop a refined index that accounts for more relevant factors, and finally seek to test the relationship between sprawl and traffic crash rates using structural equation modelling. Controlling for covariates, we find that sprawl is associated with significantly higher direct and indirect effects on fatal crash rates. The direct effect is likely due to the higher traffic speeds in sprawling areas, and the indirect effect …
Polaris: A 30-Meter Probabilistic Soil Series Map Of The Contiguous United States, Nathaniel W. Chaney, Eric F. Wood, Alexander B. Mcbratney, Jonathan W. Hempel, Travis W. Nauman, Colby W. Brungard, Nathan P. Odgers
Polaris: A 30-Meter Probabilistic Soil Series Map Of The Contiguous United States, Nathaniel W. Chaney, Eric F. Wood, Alexander B. Mcbratney, Jonathan W. Hempel, Travis W. Nauman, Colby W. Brungard, Nathan P. Odgers
United States Geological Survey: Staff Publications
A newcomplete map of soil series probabilities has been produced for the contiguous United States at a 30mspatial resolution. This innovative database, named POLARIS, is constructed using available high-resolution geospatial environmental data and a state-of-the-art machine learning algorithm (DSMART-HPC) to remap the Soil Survey Geographic (SSURGO) database. This 9 billion grid cell database is possible using available high performance computing resources. POLARIS provides a spatially continuous, internally consistent, quantitative prediction of soil series. It offers potential solutions to the primary weaknesses in SSURGO: 1) unmapped areas are gap-filled using survey data from the surrounding regions, 2) the artificial discontinuities at …
Geochemical Evidence For Seasonal Controls On The Transportation Of Holocene Loess, Matanuska Valley, Southern Alaska, Usa, Daniel R. Muhs, James R. Budahn, Gary Skipp, John P. Mcgeehin
Geochemical Evidence For Seasonal Controls On The Transportation Of Holocene Loess, Matanuska Valley, Southern Alaska, Usa, Daniel R. Muhs, James R. Budahn, Gary Skipp, John P. Mcgeehin
United States Geological Survey: Staff Publications
Loess is a widespread Quaternary deposit in Alaska and loess accretion occurs today in some regions, such as the Matanuska Valley. The source of loess in the Matanuska Valley has been debated for more than seven decades, with the Knik River and the Matanuska River, both to the east, being the leading candidates and the Susitna River, to the west, as a less favorable source. We report here new stratigraphic, mineralogic, and geochemical data that test the competing hypotheses of these river sources. Loess thickness data are consistent with previous studies that show that a source or sources lay to …
Retrospective: Adjusting Contaminant Concentrations In Bird Eggs To Account For Moisture And Lipid Loss During Their Incubation, Barnett A. Rattner, Stanley N. Wiemeyer, Lawrence J. Blus
Retrospective: Adjusting Contaminant Concentrations In Bird Eggs To Account For Moisture And Lipid Loss During Their Incubation, Barnett A. Rattner, Stanley N. Wiemeyer, Lawrence J. Blus
United States Geological Survey: Staff Publications
By the 1960s, research and monitoring efforts on chlorinated
pesticide residues in tissues of wildlife were well
underway in North America and Europe. Conservationists
and natural resource managers were attempting to resolve
whether pesticide exposure and accumulated residues were
related to population declines in several species of predatory
and scavenging birds (e.g., bald eagle Haliaeetus
leucocephalus, peregrine falcon Falco peregrinus, brown
pelican Pelecanus occidentalis and osprey Pandion haliaetus).
The avian egg was a favored sampling matrix even
before the realization that eggshell thinning was linked to
population declines (Ratcliffe 1967; Hickey and Anderson
1968) and that the …
Stakeholder Coinquiries On Drought Impacts, Monitoring And Early Warning Systems, Kevin Collins, Jamie Hannaford, Mark D. Svoboda, Cody L. Knutson, Nicole A. Wall, Tonya K. Bernadt, Neville Crossman, Ian Overton, Mike Acreman, Sophie Bachmair, Kerstin Stahl
Stakeholder Coinquiries On Drought Impacts, Monitoring And Early Warning Systems, Kevin Collins, Jamie Hannaford, Mark D. Svoboda, Cody L. Knutson, Nicole A. Wall, Tonya K. Bernadt, Neville Crossman, Ian Overton, Mike Acreman, Sophie Bachmair, Kerstin Stahl
Drought Mitigation Center: Faculty Publications
The goal of the DrIVER (Drought Impacts: Vulnerability thresholds in monitoring and Early-warning Research) research project is to understand the links between natural (hydro-meteorological) drought and ecological response and socio-economic impacts to aid in developing enhanced drought early warning systems (DEWS). Three stakeholder workshops were convened in the USA, UK and Australia. The USA water supply case study engaged 27 community water suppliers and state, federal and private advisors in the Neuse and Cape Fear River basins in North Carolina. The UK workshop involved 34 national and regional stakeholders across the water supply, environmental regulation, agriculture, energy and health sectors. …
The Implications Of Climate Change For Nebraska: Summary Report Of Sector-Based Roundtable Discussions, Donald A. Wilhite, Kimberly Morrow
The Implications Of Climate Change For Nebraska: Summary Report Of Sector-Based Roundtable Discussions, Donald A. Wilhite, Kimberly Morrow
Drought Mitigation Center: Faculty Publications
This report is the result of the work of many individuals that contributed to the success of the series of eight sector-based roundtable events that were held in September and October of 2015. First and foremost, we would like to thank the organizers and the organizations they represent for their leadership in bringing together a diverse set of key stakeholders to discuss the implications of climate change on their sector. It was such a pleasure to work with such a dedicated group of individuals. Second, we would like to thank the more than 350 people who participated in these discussions …
Drought And Health In The Context Of Public Engagement, Nicole Wall, Michael Hayes
Drought And Health In The Context Of Public Engagement, Nicole Wall, Michael Hayes
Drought Mitigation Center: Faculty Publications
Droughts have profoundly affected societies around the world from the earliest beginnings. A recent estimate from the Centre for Research on the Epidemiology of Disasters (CRED) claims that more than 1 billion people have been affected by drought during the twenty-year period between 1994 and 2013. Because of the characteristics of drought, drought impacts are often difficult to identify and quantify, and this is especially true with public health-oriented drought consequences, including those resulting from low water quantities, poor water quality, mental health and stress, dust and windblown agents, and wildlife intrusion. However, when officials emphasize adopting a proactive risk …
From Grassroots To National Alliance: The Emerging Trajectory For Landowner Prescribed Burn Associations, John R. Weir, Dirac L. Twidwell, Carissa L. Wonkka
From Grassroots To National Alliance: The Emerging Trajectory For Landowner Prescribed Burn Associations, John R. Weir, Dirac L. Twidwell, Carissa L. Wonkka
Drought Mitigation Center: Faculty Publications
• Due to woody plant encroachment and seeing the need for fire on their lands, private landowners throughout the southern Great Plains have started forming prescribed burn associations (PBA) to assist each other with conducting prescribed fires. • Members of PBAs work together by pooling equipment and other resources, organizing training opportunities, and assisting with prescribed burns on each other’s properties, while teaching upcoming generations and inexperienced members the value of fire in grassland conservation and how to safely use it. • There are over 50 PBAs working in the southern Great Plains. As the number of PBAs has grown …
New Tools For Assessing Drought Conditions For Rangeland Management, Cody Knutson, Brian Fuchs
New Tools For Assessing Drought Conditions For Rangeland Management, Cody Knutson, Brian Fuchs
Drought Mitigation Center: Faculty Publications
Historical drought assessment and ongoingmonitoring is essential for understanding past drought occurrence, the relationships between past drought and its impacts, and for triggering action during current drought events. • A variety of new products have recently been developed to better monitor drought conditions and assess past occurrences at the local scale. • A growing number of resources are available to assist rangeland managers to develop a monitoring system and incorporate it into a drought management plan.
Rangeland Responses To Predicted Increases In Drought Extremity, David D. Breshears, Alan K. Knapp, Darin J. Law, Melinda D. Smith, Dirac L. Twidwell, Carissa L. Wonkka
Rangeland Responses To Predicted Increases In Drought Extremity, David D. Breshears, Alan K. Knapp, Darin J. Law, Melinda D. Smith, Dirac L. Twidwell, Carissa L. Wonkka
Drought Mitigation Center: Faculty Publications
Rangeland managers actively focus on the potential to induce a shift in a site to an alternative state, but predicted changes in climate, particularly the likelihood of more extreme drought, necessitate reevaluating risks for alternative states. • Rangelands will differ in their susceptibility to undergo state changes due to climate change in general and for droughts of the future, in particular, which may be hotter. • Trees, shrubs, and grasses are expected to differ in their sensitivity to drought, with trees likely being most sensitive; this affects the likelihood for state changes in grasslands, shrublands, woodlands, and savannas. • Considering …