Intercalibration of age readings of deepwater black scabbardfish, Aphanopus carbo (Lowe, 1839)     

Morales-Nin  B.; Canha  A; Casas  M.; Figuereido  I.; Gordo  L. S.; Gordon  J. D. M.; Gouveia  E.; Pineiro  C. G.; Reis  S.; Reis  A.; Swan  S. C. 《ICES Journal of Marine Science》2002,59(2):352-364

  相似文献   

Triassic stretching directions in Iberia and North Africa inferred from magnetic fabrics   总被引：1，自引：0，他引：1  

Ruth Soto  Antonio M. Casas‐Sainz  Beln Oliva‐Urcia  Cristina García‐Lasanta  Esther Izquierdo‐Llavall  Bennacer Moussaid  Jos Carlos Kullberg  Teresa Romn‐Berdiel  Yolanda Snchez‐Moya  Alfonso Sopea  Sara Torres‐Lpez  Juan Jos Villalaín  Hamidou El‐Ouardi  Inmaculada Gil‐Pea  Ann M. Hirt 《地学学报》2019,31(5):465-478

During the Triassic, Iberia and western North Africa displayed a unique situation in relation with the Central and North Atlantic opening and westward expansion of the Tethys. Unravelling the stretching direction in Triassic deposits of the studied area can help in our understanding of this scenario. The tectonic setting is characterized by localized basins with strong thickness variations greatly influenced by previous post‐Variscan mechanical discontinuities. In this work, we revise and compile magnetic fabric data from eight Triassic depocentres in terms of defining the stretching direction (i.e. magnetic lineation), resulting from extensional deformation of this period. Data show the importance of the opening of the Atlantic rift as the leading process during the Triassic. Dextral transtension can explain the deflection of the extensional direction observed in most studied depocentres that is caused by the activity of previous major oblique faults.  相似文献   

Processing Symplectic Methods for Near-Integrable Hamiltonian Systems     

S. Blanes  F. Casas  J. Ros 《Celestial Mechanics and Dynamical Astronomy》2000,77(1):17-36

Processing techniques are used to approximate the exact flow of near-integrable Hamiltonian systems depending on a small perturbation parameter. We study the reduction of the number of conditions for the kernel for this type of Hamiltonians and we build third, fourth and fifth order methods which are shown to be more efficient than previous algorithms for the same class of problems. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Abundance and distribution of Calanus finmarchicus on the Georges Bank during 1995 and 1996     

Durbin  E. G.; Garrahan  P. R.; Casas  M. C. 《ICES Journal of Marine Science》2000,57(6):1664-1685

  相似文献   

Seismic Zonation of Barcelona Based on Numerical Simulation of Site Effects   总被引：1，自引：0，他引：1  

J. Cid  T. Susagna  X. Goula  L. Chavarria  S. Figueras  J. Fleta  A. Casas  A. Roca 《Pure and Applied Geophysics》2001,158(12):2559-2577

—?Seismic responses of different sites of Barcelona have been investigated through numerical modelling. Geological maps and geotechnical data available from drillings for buildings and infrastructures have been used to determine the dynamical properties of the soils through different correlations between standard geotechnical data and dynamical parameters obtained in other regions. An estimation of the depth of the Palaeozoic basement has been obtained through an inversion of a detailed gravity survey. A 1-D equivalent linear method has been used to compute complete transfer functions and other spectral responses, such as PSA and PSV for various damping values, with the purpose of classifying zones with similar behaviour. Given the uncertainties associated with the input data, a Montecarlo's simulation process has been carried out. Four zones, characterized by their corresponding transfer function and by PGA amplifications, are proposed. The numerical results are compared with those previously obtained through microtremor measurements, showing that predominant periods derived from Nakamura's technique should be taken carefully.  相似文献   

The Sunspot Catalogues of Carrington, Peters and de la Rue: Quality Control and Machine-Readable Versions     

R. Casas  J. M. Vaquero 《Solar physics》2014,289(1):79-90

  相似文献   

Rainfall spatial organization and areal reduction factors in the metropolitan area of Barcelona (Spain)     

Raul Rodríguez  Xavier Navarro  M. Carmen Casas  Angel Redaño 《Theoretical and Applied Climatology》2013,114(1-2):1-8

The rainfall spatial organization in the metropolitan area of Barcelona (Spain) has been studied from records of an urban rain gauge network in the period 1994–2009. Using statistical and regional analysis techniques, correlation between data recorded by the different rain gauges has been calculated, and the effective number of independent stations (n _eq) equivalent to the used network has been determined. It has been found out that for durations longer than 20 min, the areal rainfall return period observed for a storm registered by the network approximately decreases by a factor of 1/n _eq in relation to the current point rainfall intensity–duration–frequency relationships for the metropolitan area of Barcelona. Using objective analysis techniques, continuous precipitation fields have been generated on a regular grid with a spatial resolution of 300?×?300 m for the storms registered by the rain gauges from 1994 to 2009, for durations from 10 min to 24 h. The precipitation fields obtained have been useful to estimate the characteristic areal reduction factors in the metropolitan area of Barcelona. A direct relationship has been found between the areal reduction factor for all the area corresponding to the urban rainfall network of Barcelona and the effective number of n _eq for every duration considered.  相似文献   

Scientific management of Mediterranean coastal zone: a hybrid ocean forecasting system for oil spill and search and rescue operations     

Jordi A  Ferrer MI  Vizoso G  Orfila A  Basterretxea G  Casas B  Alvarez A  Roig D  Garau B  Martínez M  Fernández V  Fornés A  Ruiz M  Fornós JJ  Balaguer P  Duarte CM  Rodríguez I  Alvarez E  Onken R  Orfila P  Tintoré J 《Marine pollution bulletin》2006,53(5-7):361-368

The oil spill from Prestige tanker showed the importance of scientifically based protocols to minimize the impacts on the environment. In this work, we describe a new forecasting system to predict oil spill trajectories and their potential impacts on the coastal zone. The system is formed of three main interconnected modules that address different capabilities: (1) an operational circulation sub-system that includes nested models at different scales, data collection with near-real time assimilation, new tools for initialization or assimilation based on genetic algorithms and feature-oriented strategic sampling; (2) an oil spill coastal sub-system that allows simulation of the trajectories and fate of spilled oil together with evaluation of coastal zone vulnerability using environmental sensitivity indexes; (3) a risk management sub-system for decision support based on GIS technology. The system is applied to the Mediterranean Sea where surface currents are highly variable in space and time, and interactions between local, sub-basin and basin scale increase the non-linear interactions effects which need to be adequately resolved at each one of the intervening scales. Besides the Mediterranean Sea is a complex reduced scale ocean representing a real scientific and technological challenge for operational oceanography and particularly for oil spill response and search and rescue operations.  相似文献   

Magnetometry and ground-penetrating radar surveys applied to tracing potential collectors of mining-derived pollutants in coastal sediments (Piscinas Bay,Montevecchio mining area,SW Sardinia)     

Ó. Pueyo Anchuela  P. Frongia  F. Di Gregorio  A. M. Casas Sainz  A. Pocoví Juan 《Environmental Earth Sciences》2017,76(5):230

Dispersion of pollutants from mining areas can result in risks to human health. The dynamic interaction of geological processes can generate complex situations that favor enrichment in toxic elements by sedimentary and diagenetic mechanisms. In order to explore the distribution of iron-rich minerals in coastal and river sediments, a geophysical campaign was performed along the outlet of the Piscinas and Naracauli Rivers that drain two abandoned mining areas in SW Sardinia. Both rivers flow into the Mediterranean Sea, a bay where fluvial, marine, and eolian processes interact. The geophysical campaign comprised magnetometry and ground-penetrating radar surveys. Magnetic properties were controlled by means of magnetic susceptibility measurements along the beach and dune areas, through sampling of surface sediments, natural outcrops and trenches, and considering different grain size intervals. Results indicate enrichment in ferromagnetic minerals at the leeside of dunes and berms. Sedimentological interpretation is supported by means of ground-penetrating radar. Due to both sedimentary and diagenetic processes, the 100- to 300-μm fraction of fine sands exhibits high susceptibility. Implied tenors of toxic elements in the magnetite may represent a serious hazard to environmental and health security. The results inferred from magnetic anomalies support the applicability of the geophysical approach in order to locate high concentrations of iron-rich particles both at surface and below ground and the usefulness of joint evaluation of magnetic susceptibility and ground-penetrating radar in order to characterize the sedimentary and geomorphology-controlled magnetite distribution.  相似文献