Precipitation Anomalies
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Dry spells occurrence in the northwest portion of Rio Grande do Sul state between the years 1978 and 2005 and its association to the climatic conditions in the atmosphere / Veranicos ocorridos na porção noroeste do estado do Rio Grande do Sul entre 1978 e 2005 e sua associação às condições climáticas na atmosfera
Agriculture plays an extremely important role in the economy of Rio Grande do Sul state. The target region of the present work in its northwest portion is represented by six cities: São Luiz Gonzaga, Santa Rosa, Cruz Alta, Iraí, Passo Fundo e Marcelino Ramos. It constitute a national focus of soya production and thus depend heavily on atmospheric condition
Publicado em: 2008
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14. Padrões de circulação anômala associados a episódios úmidos e secos no sul do Brasil / Anomalous circulation patterns associated with wet and dry events in southern Brazil
The characteristics of the atmospheric circulation associated with persistent wet and dry events in Southern Brazil during all seasons were studied from 1979 to 2002, using precipitation pentad data. The result shows that the dominant oscillations of rainfall variability have periods between 2 and 6 pentads. Superposition of different periods was also identi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/04/2007
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15. Relação entre a precipitação pluvial na região Nordeste do Rio Grande do Sul e a Temperatura da Superfície do Mar dos Oceanos Atlântico e Pacífico
Vários estudos fornecem evidências de que os oceanos Atlântico e Pacífico desempenham um papel significativo nas flutuações climáticas que ocorrem na região Sul do Brasil , influenciando principalmente na precipitação pluvial. Dentre as variáveis mais utilizadas, pesquisadas e que mais influenciam na precipitação pluvial, destaca-se a Temperatur
Publicado em: 2007
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16. Padrões sinóticos de circulação atmosférica associados ao jato em baixos níveis a leste da Cordilheira ds Andes, na América do Sul / Atmospheric circulation patterns associated with the south america low level jet at east of the Andes
The objective of this studywas toidentify the atmospheric patterns circulationassociated with the South American Low-level Jet (LLJ). The zonal (u) and meridional (v) wind, geopotential height (f), temperature (T), specific humidity (q) and other variables from National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2006
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17. Impactos climáticos regionais da mudança de vegetação no semi-árido do nordeste brasileiro / Impacts climatics regionals of the change vegetation in the simi-arid in the northeast Brazil
In the present study the regional climatic impacts due to the vegetation changes were evaluated, through long term numerical simulations with the regional Eta/SSiB model of the CPTEC/INPE, in which modifications were included to operate in climatic mode. The work was accomplished in two phases. In Phase I, it was evaluated the climatic change of the Northeas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/03/2006
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18. Impactos climáticos regionais da mudança de vegetação no semi-árido do nordeste brasileiro / Impacts climatics regionals of the change vegetation in the simi-arid in the northeast Brazil
In the present study the regional climatic impacts due to the vegetation changes were evaluated, through long term numerical simulations with the regional Eta/SSiB model of the CPTEC/INPE, in which modifications were included to operate in climatic mode. The work was accomplished in two phases. In Phase I, it was evaluated the climatic change of the Northeas
Publicado em: 2006
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19. Atividade Convectiva no Sul da América do Sul / Mesoscale Convective Systems (MCS) at South of South America
In this work synoptic and mesoscale aspects are analyzed in association to the formation of Mesoscale Convective Systems (MCS) at South of South America (SA) that reached the State of Rio Grande do Sul (RS) in some moment during its life time. The selected period involves the month of February of the years 2002 to 2005. Among the identified MCS, two cases ha
Publicado em: 2006
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20. Albedo of an Amazon tropical rainforest: field measurements, remote sensing, modeling, and its influence on the regional climate / Albedo de uma floresta tropical Amazônica: medições de campo, sensoriamento remoto, modelagem, e sua influência no clima regional
Albedo is defined as a ratio between reflected solar radiation and incoming solar radiation over a surface. It is a main factor that affects the terrestrial radiation balance and has been frequently considered in the global and regional climate studies. Amazon is one of planets regions where the response of regional atmospheric circulation is more intense. S
Publicado em: 2006
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21. An analysis of surface fluxes and of the microclimate on cerrado, sugarcane and eucalyptus: implications for regional climate changes / Uma análise dos fluxos de superfície e do microclima sobre cerrado, cana-de-açúcar e eucalipto, com implicações para mudanças climáticas regionais
This work investigates potential regional scale temperature and precipitation changes in the São Paulo state, caused by land use changes. We analised micrometeorological measurements, in the period February 2005 to February 2006, over three different ecosystems (cerrado, sugar cane and eucalyptus plantation). The surface energy balances showed that over the
Publicado em: 2006
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22. Estagnação de massa de ar quente e seco sobre a região central do Brasil / Stagnation of warm and dry air masses in the central region of Brazil
In the Southeast Region, southern parts of Central-West and northern parts of South Regions, Stagnations of Warm and Dry Air Masses (EMAQS) occur between April and September months. They are characterized by positive temperature anomalies and negative precipitation anomalies, persisting for several days. This situation causes an increase in air pollution and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2005
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23. Mineralogia e geoquímica supergênicas do urânio - Província Uranífera de Lagoa Real, Caetité - Bahia
X Ray Diffraction and Infrared Spectroscopy (FTIR) analysis reveal that the following uranyl hidroxisilicates mainly constitute the uranium secondary mineralogy from albitites of the Cachoeira and Laranjeiras uranium anomalies (Lagoa Real BA Brazil): β-Uranophane-Ca[(UO2)(SiO3OH)]2.5(H2O); Uranophane-Ca[(UO2)(SiO3OH)]2.5(H2O); Sklodowskite-Mg[(UO2)(SiO3
Publicado em: 2005
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24. Quasi-stationary waves in the southern hemisphere: observations and climate simulations over South America / Ondas quase-estacionárias no hemisférico sul: observações e simulações climáticas sobre a América do Sul
Characteristics of the quasi-stationary waves in the Southern Hemisphere with emphasis on their behavior over South America are discussed. In the first part, an observational study is performed using the NCEP/NCAR reanalysis data. The nature of seasonal and inter anual variabilities is analyzed. A comparison between the of the quasi-stationary wave s amplitu
Publicado em: 2004