Intercomparison of Secondary Inorganic Aerosol Concentrations in the UK with Predictions of the Unified Danish Eulerian Model     

Salah S. Abdalmogith  Roy M. Harrison  Zahari Zlatev 《Journal of Atmospheric Chemistry》2006,54(1):43-66

Nitrate and sulphate concentrations were measured over the period January 2002–December 2003 on daily basis at two stations in the UK: a rural site (Harwell) and an urban site (Belfast). The measurements were compared with model results obtained by using the Unified Danish Eulerian Model (UNI-DEM), which was run using both a coarse resolution grid (50 km × 50 km surface cells) and a fine resolution grid (10 km × 10 km surface cells). The results from the comparison show reasonably good agreement between concentrations measured at the two stations and calculated by the model. This is achieved despite the absence of aqueous phase sulphur oxidation chemistry in the model. The model results were also used to predict the spatial distributions of nitrate and sulphate concentrations in the UK which agree well with observations. The contribution of mainland European emission sources and that of UK sources to pollution levels in the UK was estimated. The relative proportions differ substantially across the UK with the imported contribution to UK sulphate and nitrate typically in the range 20–45% and 35–65% respectively.  相似文献   

The genetic structure of Pandalus borealis in the Northeast Atlantic determined by RAPD analysis     

Martinez  Iciar; Aschan  Michaela; Skjerdal  Taran; Aljanabi  Salah M. 《ICES Journal of Marine Science》2006,63(5):840-850

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http://www.sciencedirect.com/science/article/pii/S1674987113001369     

Mohamed K. Salah 《地学前缘(英文版)》2014,5(6):845-854

The 3-D P- and S-wave velocity models of the upper crust beneath Southwest Iberia are determined by inverting arrival time data from local earthquakes using a seismic tomo~raphy method. We used a total of 3085 P- and 2780 S-wave high quality arrival times from 886 local earthquakes recorded by a per- manent seismic network, which is operated by the Institute of Meteorology （IM）, Lisbon, Portugal. The computed P- and S-wave velocities are used to determine the 3-D distributions of Vp/Vs ratio. The 3-D velocity and Vp/Vs ratio images display clear lateral heterogeneities in the study area. Significant veloc- ity variations up to ~6% are revealed in the upper crust beneath Southwest lberia, At 4 km depth, both P- and S-wave velocity take average to high values relative to the initial velocity model, while at 12 km, low P-wave velocities are clearly visible along the coast and in the southern parts. High S-wave velocities at 12 km depth are imaged in the central parts, and average values along the coast; although some scattered patches of low and high S-wave velocities are also revealed. The Vp/Vs rztio is generally high at depths of 4 and 12 km along the coastal parts with some regions of high Vp/Vs ratio in the north at 4 km depth, and low Vp/Vs ratio in the central southern parts at a depth of 12 km, The imaged low velocity and high Vp/Vs ratios are related to the thick saturated and unconsolidated sediments covering the region; whereas the high velocity regions are generally associated with the Mesozoic basement rocks.  相似文献   

Erratum to: Crustal velocity and Vp/Vs structures beneath central Anatolia from local seismic tomography     

Mohammed K. Salah  Şakir Şahin  Ugur Topatan  Canan Ciftci 《Arabian Journal of Geosciences》2014,7(10):4119-4119

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Upper crustal Poisson’s ratio and coda-wave attenuation beneath Eastern Anatolia     

Aydın  Ufuk  Şahin  Şakir  Salah  Mohamed K. 《地震工程与工程振动(英文版)》2020,19(2):335-347

The attenuation of seismic waves reflects the elastic nature of the media within which the waves propagate. In this study, we calculate the Coda-Q(Q_c), frequency dependence(η), Vp/Vs and Poisson's(υ) ratios by using 2621 vertical component seismograms generated by 987 earthquakes recorded by 13 seismic stations in Eastern Anatolia, and creat a 2-D seismic tomographic Q_c model for the region. The obtained model provides significant information for exploring the boundaries of adjacent tectonic units within the upper crust and interpreting their dynamic characteristics. The 2-D Q_c model and the other parameters are consistent with the seismotectonic features of Eastern Anatolia. Highly heterogeneous Q_c values are observed in the study area dividing it into north-south directed bands of low and high attenuation. The highest η values were obtained beneath the northwestern and eastern parts of the study region. Clear, high and low υ values are obtained in the western and eastern parts of the study area, respectively. The spatial variations in the measured parameters are consistent with many geophysical observations including low Pn velocities, efficient Sn blockage, high heat flow, and widespread volcanism. Different upper crustal thicknesses and inhomogeneous stress distribution along the East and North Anatolian Fault Zones may also contribute to the observed heterogeneities.  相似文献   

Effects of porosity and composition on seismic wave velocities and elastic moduli of lower cretaceous rocks,central Lebanon     

Mohamed K. Salah  Mohammad Alqudah  Ahmad K. Abd El-Aal  Christophe Barnes 《Acta Geophysica》2018,66(5):867-894

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Palynological,palynofacies, paleoenvironmental and organic geochemical studies on the Upper Cretaceous succession of the GPTSW-7 well,North Western Desert,Egypt     

Salah Y. El Beialy  Haytham S. El Atfy  Michael S. Zavada  Essam M. El Khoriby  Ramadan H. Abu-Zied 《Marine and Petroleum Geology》2010

The present study of the Abu Roash and Bahariya formations in well GPTSW-7 refines our understanding of the subsurface Cretaceous of the north Western Desert of Egypt. Our investigations are based on the palynological analyses of 71 cuttings samples, of which 24 have also been analyzed for geochemistry, in addition to 3 sidewall cores analyzed for vitrinite reflectance (R_o).  相似文献