Showing papers by "Pinhas Alpert published in 1988"
TL;DR: In this paper, a one-level sigma coordinate model was applied to the study of surface flow over an averaged summer diurnal cycle in Israel, and detailed flow features were compared to three-dimensional modeling studies and to dense surface wind observations.
Abstract: A one-level sigma-coordinate model originally developed by Danard and modified by Mass and Dempsey and Alpert et al., is applied to the study of surface flow over an averaged summer diurnal cycle in Israel. The detailed flow features are compared to three-dimensional modeling studies and to dense surface wind observations. The winds al a height of 10 m from the one-level model were found comparable to those obtained by three-dimensional simulations, and in some cases the one-level model predicted observed surface flow features that were not simulated by the three-dimensional simulations, probably because of the finer horizontal grid resolution in the one-level model. The two models had similar deficiencies in diagnosing observed flow features in many cases. A severe drawback of the one-level model is the inability to advance the sea-breeze front (SBF) over a ridge crest correctly. Based upon an earlier vertical cross-sectional study by Alpert et al., an explanation for this discrepancy is suggest...
18 citations
TL;DR: In this article, three approaches for estimating meso-β (Δx = 5-10 km) surface winds over complex terrain are applied to obtain best estimates of typical summertime surface flow in Israel, based on a detailed 3-D model, a one-level sigma model and a dense network of surface wind observations.
Abstract: Three approaches for estimating meso-β (Δx=5–10 km) surface winds over complex terrain are applied to obtain best estimates of typical summertime surface flow in Israel, based on a detailed 3-D model, a one-level sigma model and a dense network of surface wind observations. A scheme for combining the three approaches is outlined and illustrated through two examples showing how the approaches complement each other. It is suggested that such a man-machine combination is best for estimation of surface winds over complex terrain.
6 citations