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Abstract The history of the development of numerical weather prediction is presented briefly. The present state of the discipline is discussed both in terms of the type of models being used and in terms of the quality of the forecasts being produced operationally. It is shown that the goal of...
Abstract Ground‐based measurements of stratospheric NO2, using absorption spectroscopy of twilight sky in the spectral region 437–451 nm, have been made at Calgary (51.08°N, 114.13°W), Alberta, Canada, during the period December 1978‐March 10, 1979. The NO2 showed a rather steady behaviour in...
Abstract Rocketsonde observations of the zonal wind over Ascension Island (8°S) were analysed to obtain the amplitude and phase of the quasi‐biennial oscillation (QBO) in the height range 25–58 km. It was found that the amplitude peaked at about 30km and decreased rapidly above 40km. In fact,...
Abstract Micrometeorological data collected over pasture in the Peace River area of British Columbia during the wet summer of 1977 were used to test the Priestley and Taylor (1972) model for potential evaporation. The model performed very well. RMSE was less than 10% of the mean evaporation rate...
Abstract The use of population‐weighted heating degree‐days provides a more realistic estimate of the potential fuel demand for residential heating on a regional, provincial or national basis than the use of unweighted, site‐specific heating degree‐day values. A population‐weighted heating...
Abstract Analysis of radiation data from Suffield, Alberta and Swift Current, Saskatchewan reveals discrepancies that are strongly linked to changes in the actual and assigned calibration factors of the pyranometers used at those locations.
Abstract A series of photographs are presented that illustrate the ripple form and the kinematics of suspended sediment in a wave field. The strong shear on the local upstream side of the ripples and the subsequent vortex development on the downstream side is illustrated. Sediment is visible in...
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