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Articles 1 - 9 of 9
Full-Text Articles in Earth Sciences
Jurassic Eolian Oolite On A Paleohigh In The Sundance Sea, Bighorn Basin, Wyoming, Zoran Kilibarda, David Loope
Jurassic Eolian Oolite On A Paleohigh In The Sundance Sea, Bighorn Basin, Wyoming, Zoran Kilibarda, David Loope
David B. Loope
Aeolian limestones are widespread in the Quaternary record and have been identified in outcrops and cores of late Palaeozoic strata. These rocks have been interpreted as a low latitude signal of glacio-eustatic sea level fluctuations and have not been previously reported from the Mesozoic or from other episodes of earth history generally believed to have been non-glacial. Numerous lenticular bodies of cross-stratified oolite lie near the contact between the lower and upper members of the mudstone-dominated lower Sundance Formation (Middle and Upper Jurassic) in the Bighorn Basin of north-central Wyoming, USA. The lenses, up to 12 m thick, contain sedimentary …
Taking Eco-Efficiency To A New Level (Reviewing Ernst Von Weizsäcker, Amory B. Lovins, And L. Hunter Lovins, Factor Four: Doubling Wealth, Halving Resource Use (1997)), John Dernbach
John C. Dernbach
No abstract provided.
Green And Ampt Infiltration With Redistribution, Fred L. Ogden
Green And Ampt Infiltration With Redistribution, Fred L. Ogden
Fred L. Ogden
Distributed, physically based watershed and irrigation advance models require robust infiltration estimation capabilities. The empirical Green and Ampt (GA) equation of infiltration is a popular method for estimating infiltration. The GA parameters have physical basis and considerable prior research has focused on relating these parameters to soil textural classification. However, the original GA method is limited in that it is applicable only for a single ponding period. An explicit Green and Ampt redistribution (GAR) technique is developed herein to estimate interstorm redistribution of soil water and allow multiple ponding simulations using the GA methodology. Soil water redistribution during interponding periods …
Timing And Extent Of Late Quaternary Paleolakes In The Trans-Pecos Closed Basin, West Texas And South-Central New Mexico, David Wilkins, Donald Currey
Timing And Extent Of Late Quaternary Paleolakes In The Trans-Pecos Closed Basin, West Texas And South-Central New Mexico, David Wilkins, Donald Currey
David E. Wilkins
The Trans-Pecos Closed Basin is a hydrographically closed region covering 20,000 km centered on Salt Basin, 160 km east of El Paso, Texas. Geomorphic and limnetic evidence have been used to identify four major highstands for Lake King during the last glacial maximum (LGM). Additional geomorphic features from a second, recently identified, paleolake, Lake Sacramento, have been found in the Beargrass subbasin, a nested subbasin approximately 75 km northwest of Salt Basin. Radiocarbon ages of the organic material in Lake King sediments date four abrupt climate changes and rapid lacustrine transgressions during the LGM with a quasi-periodicity of 2000 yr. …
U.S. Adherence To Its Agenda 21 Commitments: A Five-Year Review, John C. Dernbach
U.S. Adherence To Its Agenda 21 Commitments: A Five-Year Review, John C. Dernbach
John C. Dernbach
No abstract provided.
The Unfocused Regulation Of Toxic And Hazardous Pollutants, John C. Dernbach
The Unfocused Regulation Of Toxic And Hazardous Pollutants, John C. Dernbach
John C. Dernbach
No abstract provided.
Tectonic Stability Of The San Luis Hills, Northern Rio Grande Rift, Colorado: Evidence From Paleomagnetic Measurements, Laurie Brown, M. P. Golombek
Tectonic Stability Of The San Luis Hills, Northern Rio Grande Rift, Colorado: Evidence From Paleomagnetic Measurements, Laurie Brown, M. P. Golombek
Laurie Brown
The San Luis Basin is the largest of four tilted, fault bounded Neogene basins of the northern Rio Grande rift in New Mexico and Colorado. It formed during the second of two episodes of extension beginning in middle Oligocene and extending to the present. The San Luis Hills are an intrarift horst of Oligocene intermediate and basalt rocks preserved in the middle of the San Luis Basin. Previous paleomagnetic and structural studies in the Espanola Basin to the south indicate counterclockwise rotation of that region during the most recent extension. Paleomagnetic samples from the two exposed formations in the San …
Assessing Surface–Atmosphere Interactions Using Former Soviet Union Standard Meteorological Network Data. Part Ii: Cloud And Snow Cover Effects, P. Ya Groisman, E. L. Genikhovich, Raymond S. Bradley, B. M. Ilyin
Assessing Surface–Atmosphere Interactions Using Former Soviet Union Standard Meteorological Network Data. Part Ii: Cloud And Snow Cover Effects, P. Ya Groisman, E. L. Genikhovich, Raymond S. Bradley, B. M. Ilyin
Raymond S Bradley
Groisman and Genikhovich developed a method to obtain direct estimates of surface turbulent heat fluxes. The authors now apply it to the territory of the former Soviet Union using the 3-/6-h data of 257 stations for the past several decades to assess the sensitivity of sensible heat flux to cloud and snow cover. This property was quantified for bare soil landscapes over the entire country. During the day, the presence of clouds is associated with low values of sensible heat flux from the surface to the atmosphere. At night (and during the day in winter in high latitudes), the sign …
Sensors For Site-Specific Management, Stuart J. Birrell, J. W. Hummel, K. A. Sudduth
Sensors For Site-Specific Management, Stuart J. Birrell, J. W. Hummel, K. A. Sudduth
Stuart J. Birrell
Site-specific management (SSM, also known as precision farming, precision agriculture, prescription farming, etc.) is a management strategy that seeks to address within-field variability and to optimize inputs such as pesticides and fertilizers on a point-by-point basis within a field. By reducing over-application and under-application of nutrients and pesticides, this strategy has the potential to improve profitability for the producer and also to reduce the threat of groundwater or surface water contamination from agrichemicals. SSM is being adopted by innovative producers across the country. Agricultural equipment manufacturers, farm input suppliers, and a host of other businesses are working along with publicsector …