74 research outputs found
United States Weather Research Program (USWRP)
After more than a decade of development by a broad cross-section of the U.S. atmospheric research community involved in planning for the National STORM Program, the Subcommittee on Atmospheric Research (SAR) of the Committee on Earth and Environmental Science (CEES) led the development of a strategic plan to realize the objectives of STORM so as to improve our nation's capability to provide accurate short-term forecasts of weather. This strategic plan will guide the planning and implementation of what is now called the United States Weather Research Program (USWRP). The USWRP is charged with achieving operational atmospheric prediction based on mesoscale observations and model results and establishing the scientific and technological basis for global atmospheric mesoscale prediction by the year 2000. The key scientific questions that are addressed under USWRP are discussed
Urban-rural air humidity differences in Szeged, Hungary
Measurements of vapour pressure, taken four times a day over a 3-year period, were used to investigate the urban
influence on diurnal and annual patterns of vapour pressure differences. The examined settlement is a medium-sized
city without significant relief in the Great Hungarian Plain. Its regional climate is continental with a long warm
season. On the basis of the results, the air in the city centre is more humid than in the rural area both by day and
at night for the duration of the whole year. The diurnal pattern shows that the urban excess has its minimum at 01:00
h and its maximum at 19:00 h in the summer months, but similar regular diurnal variation does not exist during the
rest of the year. The annual patterns show that the excess increases from January–February to August and then
decreases until November–December at each observation time. The differences and variations of urban humidity
excess can be explained by different moisture sources and by different energy balances in the urban and rural
environments. Unambiguous relationships exist between the variations of urban humidity excess and a regional
aridity index, between the variations of humidity excess and the water temperature of the River Tisza crossing the
city, as well as between the variations of humidity excess and maximum heat island intensity. The role of combustion
processes is also significant, especially in the colder half of the year
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Revisiting the hysteresis effect in surface energy budgets
The hysteresis effect in diurnal cycles of net radiation Rn and ground heat flux G0 has been observed in many studies, while the governing mechanism remains vague. In this study, we link the phenomenology of hysteresis loops to the wave phase difference between the diurnal evolutions of various terms in the surface energy balance. Rn and G0 are parameterized with the incoming solar radiation and the surface temperature as two control parameters of the surface energy partitioning. The theoretical analysis shows that the vertical water flux W and the scaled ratio math formula (net shortwave radiation to outgoing longwave radiation) play crucial roles in shaping hysteresis loops of Rn and G0. Comparisons to field measurements indicate that hysteresis loops for different land covers can be well captured by the theoretical model, which is also consistent with Camuffo-Bernadi formula. This study provides insight into the surface partitioning and temporal evolution of the energy budget at the land surface
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An Observational And Theoretical Study Of Atmospheric Flow Over A Heated Island
A long-range air pollution transport model for eastern north America—II. Nitrogen oxides
Basic Studies on the Recovery of Nickel & Cobalt from Ion Exchange Column in Aqueous & Aqueous-Organic Solvent Medium
1016-102
Relationship between Ion Exchange, Eluent Concentration & Volume Fraction of Water in Water-Ethanol, Water-Methariol & Water-Acetone Solvent Systems
1021-102
An efficient method for deriving mass-consistent flow fields from wind observations in rough terrain
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