oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 161 )

2018 ( 820 )

2017 ( 750 )

2016 ( 1108 )

Custom range...

Search Results: 1 - 10 of 464150 matches for " Federico A. Norte "
All listed articles are free for downloading (OA Articles)
Page 1 /464150
Display every page Item
Understanding and Forecasting Zonda Wind (Andean Foehn) in Argentina: A Review  [PDF]
Federico A. Norte
Atmospheric and Climate Sciences (ACS) , 2015, DOI: 10.4236/acs.2015.53012
Abstract: This paper focuses on the “state of the art” research of the Argentinian zonda wind at the beginning of 2015. Zonda (similar to foehn) is a strong, warm, very dry wind associated with adiabatic compression upon descending the eastern slopes of the Andes Cordillera in western central Argentina. Particularly, hourly surface meteorological information obtained from the Argentine National Weather Service (Servicio Meteorológico Nacional, SMN) from Mendoza Aero (32?50’S, 68?47’W, 704 m ASL) and San Juan Aero (31?34’S, 68?25’W, 598 m ASL) airport meteorological stations was used. The paper contains a history of zonda research mentioning the principal papers since the 1950s, the characteristics of zonda wind (conceptual model, a classic event, intensities categories) and examples of non-classical episodes. Also zonda dynamics, zonda climatology and forecasting problems are considered. A probabilistic method and the model forecast that are running in operative way are commented. Also the climate impact, air quality and damages caused are mentioned. There has been substantial progress in the understanding of this kind of complex wind during the last years, especially since the last decade, accelerated using different models. This paper has highlighted some of these advances by synthesizing some of the major findings. The probabilistic prediction method developed in the 1980s is still very useful to predict zonda in the cities of San Juan and Mendoza. This as well as the new available tools, such as the eta/PRM and GEM models running operatively (continuously) at PRM (Mendoza Regional Meteorology Program), offered the community the possibility to generate an Early Warning System to warn the population particularly in its severe manifestations. The answer to questions regarding time of onset of the event, place where it will occur first, duration, intensity and offset still poses a great challenge for researchers and forecasters in the region.
Validation of a Statistical Forecast Model for Zonda Wind in West Argentina Based on the Vertical Atmospheric Structure  [PDF]
Federico A. Norte, Silvia Simonelli
Atmospheric and Climate Sciences (ACS) , 2016, DOI: 10.4236/acs.2016.61004
Abstract: Zonda is a strong, warm, very dry wind associated with adiabatic compression upon descending the eastern slopes of the Andes Cordillera in western-central Argentina. This research seeks, first, to validate the skill of a statistical forecast of zonda based on the behavior of the vertical structure of the atmosphere and, second, to describe the climatology of the vertical profile leeward of the Andes. The forecast was built for May-August 1974/1983, and was verified against a series of cases recorded in the Mendoza Aero and San Juan Aero weather stations for May-August 2005/2014. It made use of the Stepwise Discriminant Analysis (SDA) and rawinsonde data from Mendoza Aero as predictors, with the following input variables: surface pressure, temperature, dew point, and the zonal and meridional components of the wind on surface and of the fixed levels up to 200 hPa. The variables selected as predictors by the SDA were: surface pressure, dew point depression at 850 hPa, meridional wind component at 850 hPa, and zonal wind component at 400 hPa. Climatology of the vertical profile of the atmosphere leeward of the Andes was built from daily rawinsonde data from Mendoza Aero for May-August 1974/1983. Zonda markedly influences the atmospheric structure leeward of the Andes in western-central Argentina. Its maximum impact occurs at 850 to 800 hPa, with significant heating and decrease of humidity. Validation of the prediction program considered deterministic and probabilistic forecasts. Contingency tables show that probability of zonda occurrence in the plains is generally overestimated, and false alarm cases are far more frequent than surprise events. The main contribution of this paper is precisely the validation of the prediction model, which ensures forecasters one more tool to improve zonda forecasting; this, in turn, will aid decision-makers when taking steps to ameliorate zonda wind impact.
Desarrollo de metgis, un sistema combinado de información geográfica, meteorológica y de cobertura de nieve de alta resolución, para la región andina
Spreitzhofer,Gerald; Norte,Federico A;
Meteorologica , 2006,
Abstract: within the framework of an interdisciplinary international research project with contributions from mountain research institutes and universities of the usa, austria, switzerland and japan, a java-based combined meteorological and geographic information system (named metgis) for south america is under development, with a special focus on the andes region of argentina, chile and peru. the geographic part of the system includes a topography based on data of the shuttle radar topographic mission (srtm) and representations of roads, railway lines, rivers, frontiers and cities. on top of various modes of terrain (elevation, slope, aspect), meteorological and snow information can be visualized in a variety of styles. the combined display of observations from various networks, of forecasts from numerical models like mm5 and of forecast errors will be possible. for a variety of parameters, meteorological input data may be subject to downscaling procedures using the vera system (vienna enhanced resolution analysis). regarding features of the system specifically related to mountain areas, the srtm data combined with vera allows a good estimation of areas with temperatures below zero and snow accumulation. for the future the inclusion of the swiss model snowpack is planned which provides simulations of the snow cover.
Desarrollo de metgis, un sistema combinado de información geográfica, meteorológica y de cobertura de nieve de alta resolución, para la región andina Development of metgis, a combined high-resolution system of geographic, meteorological and snow cover information for the andes region
Gerald Spreitzhofer,Federico A Norte
Meteorologica , 2006,
Abstract: En el marco de un proyecto de investigación interdisciplinario e internacional con participación de institutos de investigación de monta a y universidades de Estados Unidos, Austria, Suiza y Japón se construye MetGIS (Meteorological and Geographic Information System), un sistema Java de información geográfica y meteorológica para Sudamérica, focalizado en la región andina de Argentina, Chile y Perú. La sección geográfica incluye una topografía basada en datos SRTM (Shuttle Radar Topographic Missión) e información sobre las carreteras, las vías férreas, los ríos, las fronteras y las ciudades. Las gráficas de la topografía del terreno (la altitud, la pendiente y la orientación del mismo) sirven como fondo para la información meteorológica y nivológica. Con éste sistema será posible visualizar en forma combinada las observaciones de varias redes, los resultados de los pronósticos numéricos de modelos como el MM5 y los errores de dichos modelos. Los campos analizados y pronosticados pueden ser transformados a escalas de mayor resolución, usando métodos apropiados tales como el de "downscaling" (VERA = Viena Enhanced Resolution Analysis). Respecto a los rasgos del sistema, relacionados específicamente con áreas de monta a, los datos SRTM combinados con VERA permiten dar una buena estimación de las áreas con temperaturas bajo cero y acumulación de nieve. Se planea integrar en el futuro el modelo suizo SNOWPACK que realiza simulaciones de la cubierta de nieve. Within the framework of an interdisciplinary international research project with contributions from mountain research institutes and universities of the USA, Austria, Switzerland and Japan, a Java-based combined meteorological and geographic information system (named MetGIS) for South America is under development, with a special focus on the Andes region of Argentina, Chile and Peru. The geographic part of the system includes a topography based on data of the Shuttle Radar Topographic Mission (SRTM) and representations of roads, railway lines, rivers, frontiers and cities. On top of various modes of terrain (elevation, slope, aspect), meteorological and snow information can be visualized in a variety of styles. The combined display of observations from various networks, of forecasts from numerical models like MM5 and of forecast errors will be possible. For a variety of parameters, meteorological input data may be subject to downscaling procedures using the VERA system (Vienna Enhanced Resolution Analysis). Regarding features of the system specifically related to mountain areas, the SRTM data combined wi
Caracterización de sondeos estivales del norte de Mendoza mediante el análisis de componentes principales y obtención de un índice de convección
Araneo,Diego C; Simonelli,Silvia C; Norte,Federico A; Viale,Maximiliano; Santos,Jorge R;
Meteorologica , 2011,
Abstract: the principal components analysis was used to characterize the summery north mendoza rawinsondes, evaluating their capacity to identify patterns associated to the convection occurrence and defining an instability index. it was selected 326 cases, building an entry matrix with the temperature and dew point temperature anomalies for the standard levels between 850 and 300 hpa. the analysis showed 6 significant components that explain more than 91% of variance. therefore, 12 patterns were obtained, which represent different atmospheric conditions. the main correlations between the patterns and convection (c) and non convection (nc) cases were obtained for the components 6, 2, 4 and 3. the relatively wet environments with a strong gradient of t at mean and high levels would favour the convection, while it is inhibited with dry layers in mean and high levels, and weak gradients of t in low layers. the c/nc index can be estimated by a logistic multiple regression dependent to the component loadings, with a correlation of 0,5, determining a stability/instability index calculable from the t and td profiles and it depends on the climatological features of the region. the index showed an efficiency of 72%.
Caracterización de sondeos estivales del norte de Mendoza mediante el análisis de componentes principales y obtención de un índice de convección Characterization Of Summer Soundings From Northern Mendoza By Principal Components Analysis And The Obtaining Of A Convection Index
Diego C Araneo,Silvia C Simonelli,Federico A Norte,Maximiliano Viale
Meteorologica , 2011,
Abstract: Se utilizó el análisis de componentes principales para caracterizar radiosondeos estivales del norte de Mendoza, evaluando su capacidad para identificar patrones asociados a la ocurrencia de convección y definiendo un índice de inestabilidad. Se tomaron 326 casos, construyendo una matriz de anomalías de temperatura (T) y temperatura de punto de rocío (Td) de los niveles estándar entre 850 y 300 hPa. El análisis arrojó 6 componentes significativas que explican más del 91% de varianza. Así se obtuvieron 12 patrones que representan condiciones atmosféricas diferenciadas. Las mayores correlaciones entre patrones y casos de convección (C) y no convección (NC), se obtuvieron para las componentes 6, 2, 4 y 3. La convección se favorecería en entornos relativamente húmedos con un marcado gradiente de T en niveles medios y altos, mientras se inhibiría con capas secas en niveles medios y altos, y débiles gradientes de T en capas bajas. El indicador de C/NC puede estimarse por regresión múltiple logística dependiente de las componentes de carga, con una correlación conjunta de 0,5, determinando un índice de estabilidad/inestabilidad calculable a partir de los perfiles de T y Td y dependiente de las características climatológicas de la región. El índice mostró una efectividad del 72%. The Principal Components Analysis was used to characterize the summery North Mendoza rawinsondes, evaluating their capacity to identify patterns associated to the convection occurrence and defining an instability index. It was selected 326 cases, building an entry matrix with the temperature and dew point temperature anomalies for the standard levels between 850 and 300 hPa. The analysis showed 6 significant components that explain more than 91% of variance. Therefore, 12 patterns were obtained, which represent different atmospheric conditions. The main correlations between the patterns and convection (C) and non convection (NC) cases were obtained for the components 6, 2, 4 and 3. The relatively wet environments with a strong gradient of T at mean and high levels would favour the convection, while it is inhibited with dry layers in mean and high levels, and weak gradients of T in low layers. The C/NC index can be estimated by a logistic multiple regression dependent to the component loadings, with a correlation of 0,5, determining a stability/instability index calculable from the T and Td profiles and it depends on the climatological features of the region. The index showed an efficiency of 72%.
Impacto del fenómeno ENOS en el régimen hidrometeorológico de Mendoza, Argentina
Norte, Federico,Simonelli, Silvia,Heredia, Nicolás
Bulletin de l'Institut Francais d'études Andines , 1998,
Abstract: IMPACT DU PHéNOMèNE ENSO SUR LE RéGIME HYDROMéTéOROLOGIQUE DE MENDONZA, ARGENTINE. Le principal objectif de ce travail est d analyser les effets hydrométéorologiques causés par ENSO dans la province de Mendoza, Argentine. Ensuite on étudiera les conditions météorologiques prédominantes (situations synoptiques les plus fréquentes et les phénomènes de méso-échelle associés) pendant l hiver, en plaine et dans la cordillère. On caractérise la zone étudiée hydrologiquement et climatologiquement. On utilise pour cela les données de débits mensuels des principales rivières de la région ainsi que les données climatiques, synoptiques et des images de satellite. Notre étude couvre les événements ENSO de ce siècle et plus particulièrement ceux de 1982-1983, 1986-1987, 1991-1993 et les premières manifestations de celui de 1997-1998. Les principaux résultats montrent, pour les années ENSO, une forte augmentation des débits des rivières à la fin du printemps et pendant l été provoqué par l excès de précipitation de l hiver antérieur. Les plus forts débits ont été observés au cours de l'événement chaud de 1982-1983, considéré jusqu'à 1997 comme le plus fort de ce siècle. L impact principal sur le régime hydrique est d à l anomalie positive de précipitations dans la partie de la cordillère qui a un régime hivernal. On en conclut que les plus fortes précipitations de la cordillère sont reliées à une augmentation de la fréquence des passages de zones de basse pression et d incursions d onde longue à des latitudes plus basses que la normale. Ceci provoque une anomalie négative dans le champ de pression de surface et des couches moyennes de l atmosphère. El objetivo principal del trabajo es analizar los efectos hidrometeorológicos que ocasiona el evento cálido ENOS en la provincia de Mendoza, Argentina. Los objetivos secundarios son considerar las condiciones meteorológicas predominantes (situaciones sinópticas más frecuentes) durante el invierno tanto en el llano como en el sector cordillerano. Se caracteriza hidrológica y climatológicamente al área de estudio. Se utilizan datos de caudales mensuales de los principales ríos de la región, así como datos climáticos, sinópticos. El estudio abarca los eventos cálidos ENOS registrados en este siglo, haciendo énfasis en los casos de 1982-1983, 1986-1987, 1991-1993 y las primeras manifestaciones del evento de 1997-1998. Los resultados principales muestran un incremento sustancial de los caudales en el período estival como resultado del exceso de precipitación invernal producido por el correspondiente evento cálido ENOS. Se desta
Calidad de la dieta espa?ola según el índice de alimentación saludable
Norte Navarro,A. I.; Ortiz Moncada,R.;
Nutrición Hospitalaria , 2011,
Abstract: objective: to determine the quality of the spanish diet by means of the healthy feeding index (iase) and its relationship with geographical and socioeconomic variables. methods: cross-sectional descriptive study from the national heath questionnaire 2006 (ens-2006). 29,478 people answering the frequency of consumption questionnaire (cfc) were studied (women = 15,019; men =14,459). the iase comprises 10 variables (grains and derivatives, vegetables, fruits, dairy products, meats, legumes, cold-processed meats, sweets, beverages, and diet-variety) constructed from the cfc and the recommendations of the feeding guidelines (spanish society of community nutrition 2004). the iase categories (maximum score: 100) were: healthy feeding > 80 points; need-for-change > 5,080; little healthy, 50. a descriptive analysis was performed with differences of the means (kruskal-wallis and mann-whitney tests), and the chi-square test to study the independency of the variables such as age, gender, social class, and educational level with the iase categories. results: 72% of the whole sample needs changes in their feeding patterns. the mean score for women was 73.7 ± 10.5 and for men 69.9 ± 11.3 (p < 0.001). among the healthy category, the age group > 65 years and women obtain higher percentage (38.8% and 28.3%, respectively) in comparison to men (18.4%). besides, the higher the social class the higher the healthy diet index will be (class-i: 24.4%, class-ii: 25.0%, class-iii: 25.8%) (p < 0.001). the autonomous communities from valencia (5.4%), balearic islands (4.6%) and andalusia (4.3%) are the ones presenting the highest index of little healthy feeding. conclusions: the iase is a rapid and cheap method to estimate the quality of the diet in the population since it uses secondary data coming from the ens and the feeding guidelines. it is useful to planning the nutritional policies in spain.
Calidad de la dieta espa ola según el índice de alimentación saludable Spanish diet quality according to the healthy eating index
A. I. Norte Navarro,R. Ortiz Moncada
Nutrición Hospitalaria , 2011,
Abstract: Objetivo: determinar la calidad de la dieta espa ola mediante el índice de Alimentación-Saludable (IASE) y su relación con variables geográficas y socioeconómicas. Metodología: Estudio descriptivo transversal a partir de Encuesta-Nacional-Salud-2006 (ENS-2006) Se estudiaron 29.478 personas (Mujeres = 15.019; Hombres = 14.459) que respondieron el Cuestionario de Frecuencia de Consumo (CFC). El IASE se compone de 10 variables (Cereales-derivados, Verduras-hortalizas, Frutas, Leche-derivados, Carnes, Legumbres, Embutidos-fiambres, Dulces, Refrescos-azúcar y Variedad-dieta), construidas a partir del CFC y las recomendaciones de las Guías-Alimentarias (Sociedad-Espa ola-Nutrición-Comunitaria-2004). Categorías IASE (puntuación-máxima 100): Alimentación-saludable: > 80 puntos; Necesita-cambios: > 5.080; Poco-saludable: 50. Se realizó un análisis descriptivo, de diferencias de medias (pruebas Krus-kal-Wallis y Mann-Whitney), y prueba Chi-Cuadrado, para estudiar la independencia de las variables edad, sexo, clase-social y nivel de estudios con las categorías de IASE. Resultados: El 72% del total de la muestra necesita cambios en su alimentación. La puntuación media para mujeres es 73,7 ± 10,5 y para hombres 69,9 ± 11,3 (p < 0,001). En la categoría saludable obtienen mayor porcentaje (38,8%) el grupo de edad > 65 a os y las mujeres (28,3%) frente a los hombres (18,4%). Así mismo, las clases-sociales mas altas (clase-I: 24,4%, clase-II: 25,0%, clase-III: 25,8%) presentan mayor índice de alimentación-saludable, (p < 0,001). Las Comunidades-Autónomas: Comunitat Valenciana (5,4%), Illes Balears (4,6%) y Andalucía (4,3%) son las que presentan mayor índice en la categoría poco-saludable. Conclusiones: El IASE es un método rápido y económico de estimación de la calidad de la dieta de la población, porque utiliza datos secundarios procedente de la ENS y de las guías-alimentarias; siendo útil en la planificación de políticas nutricionales en Espa a. Objective: To determine the quality of the Spanish diet by means of the Healthy Feeding Index (IASE) and its relationship with geographical and socioeconomic variables. Methods: Cross-sectional descriptive study from the National Heath Questionnaire 2006 (ENS-2006). 29,478 people answering the Frequency of Consumption Questionnaire (CFC) were studied (women = 15,019; men =14,459). The IASE comprises 10 variables (grains and derivatives, vegetables, fruits, dairy products, meats, legumes, cold-processed meats, sweets, beverages, and diet-variety) constructed from the CFC and the recommendations of the Feeding Guidelines (Spanish
Use of Population Parameters in Examining Changes in the Status of the Short-Necked Clam Paphia undulata Born, 1778 (Mollusca, Pelecypoda: Veneridae) in Coastal Waters of Southern Negros Occidental
Anabelle del Norte Campos,Karen A. Villarta
Science Diliman , 2010,
Abstract: Growth, recruitment, mortality and exploitation rate of the short-necked clam Paphia undulata (Born, 1778) were studied in southern Negros Occidental waters between August 2007 and July 2008 from length-frequency data derived from catches of divers, to be able to compare with earlier data derived and analyzed 13 years ago by Agasen et al. (1998). Both sets of data were analyzed using the FiSAT software (Gayanilo & Pauly, 1997). The asymptotic shell length (S¥ = 79 mm) derived from the present data proved to be smaller compared to the earlier data (SL¥ = 81.5 mm) due to the lack of bigger sizes in the present samples. The growth constant (K = 1.0 yr-1) was however comparable indicating it to be a more species-characteristic parameter. Two recruitment pulses for each study were derived and were found to be correlated with the spawning pattern in the species. The value of natural mortality (M = 1.57 yr-1) derived from bivalve literature, is deemed more appropriate compared to the earlier estimate (M = 2.89 yr-1) based on Pauly’s (1980) empirical equation developed for fish. Total mortality (Z) values for both studies were comparable, but a higher level of fishing mortality (F = 4.61 yr-1) was estimated for the present data set, thus resulting likewise in a higher exploitation rate (E = 0.75). These, together with fishery information from an accompanying paper (Villarta & del Norte-Campos, 2010), not only validate the earlier findings of overexploitation due to lack of management, but reveal a worsening condition of the stock, most likely as a result of growth overfishing. Overexploitation can only be mitigated by imposing stringent restrictions in terms of the minimum size for exploitation (45 mm shell length) and closed seasons during the spawning peak (August-November).
Page 1 /464150
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.